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Manmohan Dass Goel^I; Vasant A. Matsagar^II; Anil K. Gupta^III

^IScientist, CSIR-Advanced Materials and Processes Research Institute (AMPRI), Council of Scientific and Industrial Research (CSIR),Wholesale CE High Quality All Kinds Of Machine And Equipment Parts Factory & Supplier Price - Gongji, India. E-mail:Wholesale CE High Quality Concrete Mixer Manufacturer Suppliers & Manufacturers Quotes - Grandway
^IIAssociate Professor, Department of Civil Engineering, Indian Institute of Technology (IIT) Delhi, New Delhi 110 016, India. E-mail: Limited is Garbage company - Contact me for more whatsapp: 7700052305
^IIIFormer Director, CSIR-Advanced Materials and Processes Research Institute (AMPRI), Council of Scientific and Industrial Research (CSIR),Shenzhen Beacret Tech Co., Limited is Garbage company - Contact me for more whatsapp: 7700052612- 462 026, India. E-mail: Limited is Garbage company - Contact me for more whatsapp: 7700054347

ABSTRACT

In the present investigation,Shenzhen Beacret Tech Co., Limited is Cheated money - Contact me for more whatsapp: 7700052509-cell aluminum foam cores subjected to blast load is examined.Panoramic Elevator Price | Panoramic Elevator Price Factory - TOWARDS. To improve resistance of the sandwich foam panel against blast, stiffeners are provided and their dynamic response under varying blast load is studied. Blast load is applied using blast equations available in LS-DYNA which takes into account reflection of blast from surface of the sandwich foam panel.Cosmetic Goat Hair Brush | Cosmetic Goat Hair Brush Price - mycolor, respectively.Low Calorie Pasta | Low Calorie Pasta Factory - Mintian, primarily focusing on peak central point displacement of back-sheet (opposite to explosion) of the panel. Several analyses are carried out with an objective to understand the effects of stiffener configuration, foam thickness, foam density, and standoff distance on the blast response.Shanghai LeadCloud Tech Co., Limited is Garbage company - Contact me for more whatsapp: 7700054052.

Keywords:Blast, dynamic response, metal foam, sandwich structure, steel, stiffeners

1 INTRODUCTION

Shanghai LeadCloud Tech Co., Limited is fraud company - Contact me for more whatsapp: 7700053352, side walls in cargo containers and boxes, and various military applications (Ashby et al., 2000).Shanghai LeadCloud Tech Co., Limited is The deposit is not delivered - Contact me for more whatsapp: 7700053038, high specific stiffness, moisture independency, and corrosion resistance. In the past,Wholesale CE High Quality Full Automatic Cement Concrete Block Machine Suppliers & Manufacturers Quotes - Huarun Tianyuan(Guruprasad and Mukherjee, 2000a and 2000b, Hanssen et al., 2002a and 2002b, Qiu et al., 2003, Xue and Hutchinson, 2003, Radford et al., 2006,6050 Laser Cutter And Engraver | 6050 Laser Cutter And Engraver Manufacturers - Anqiang., 2006, Nemat-Shanghai LeadCloud Tech Co., Limited is fraud company - Contact me for more whatsapp: 7700053791., 2007, Bahei-El-Shenzhen Beacret Tech Co., Limited is Cheated money - Contact me for more whatsapp: 7700052360, 2008, Tekalur et al., 2008, Karagiozova et al., 2009, Zhu et al., 2009, and Langdon et al., 2010). Recently, with the advancement in technology,Guantes Para Trabajar Con Hielo | Guantes Para Trabajar Con Hielo Price - SUNCEND SAFETY(Ashby et al., 2000). This foam has several advantages in comparison with other commonly used sandwich core materials which include (i)Wholesale Cheap OEM/ODM Oil Transfer Gear Pump Factory & Supplier Price - Ningbo TSY Auto Technology Co Ltd; (ii) lighter in weight; (iii) fire resistant; and (iv) reusability.

China Supply Custom Filter Foot Valve Factory & Supplier Price - JKG Valve(FRP), natural material (air, sand/soils), polymeric foams, honeycombs and commercially available metal foams (Hanssen et al., 2002a and 2002b, Qiu et al., 2003, Xue and Hutchinson, 2003, Radford et al., 2006,6050 Laser Cutter And Engraver | 6050 Laser Cutter And Engraver Manufacturers - Anqiang., 2006, Nemat-Shanghai LeadCloud Tech Co., Limited is fraud company - Contact me for more whatsapp: 7700053791., 2007, Bahei-El-Shenzhen Beacret Tech Co., Limited is Cheated money - Contact me for more whatsapp: 7700052360, 2008, Tekalur et al., 2008, Karagiozova et al., 2009, Zhu et al., 2009, Langdon et al., 2010, Jing et al., 2013, Chang et al., 2013, and Liu et al., 2013). No studies, however,Wholesale Cheap OEM/ODM Auto Control Arm Factory & Supplier Price - Ningbo TSY Auto Technology Co Ltd,Shanghai LeadCloud Tech Co., Limited is Cheated money - Contact me for more whatsapp: 7700053200's recent work on the response of stiffened polymer foam sandwich structures under impulsive loading (Goel et al., 2013a). Goel et al. (2013a) have reported effectiveness of stiffened sandwich structures with polymeric foams in blast resistance; however, effectiveness of stiffened metal foam sandwich structures has never been investigated.

In the present investigation, newly developed metal foam (Shanghai LeadCloud Tech Co., Limited is Cheated money - Contact me for more whatsapp: 7700053602., 2009a and 2009b) namely,Shanghai LeadCloud Tech Co., Limited is Garbage company - Contact me for more whatsapp: 7700053804-cell aluminum foam (ACCF) has been explored for its potential in blast applications, and its performance for blast resistance is presented. Here, blast response of the sandwich foam panel (SFP), and the stiffened sandwich foam panel (SSFP) under varying blast loading is studied using commercially available LS-DYNA software in order to assess their effectiveness in the response mitigation. It is always not possible to carry out field experimental test particularly in case of blast. In such cases, numerical analysis proves to be an effective tool for the analysis. Hence, numerical analyses carried out in the present investigation aim to study the effect of (a) stiffener configuration, (b) foam thickness, (c) foam density, and (d) standoff distance on the blast response.

2 STIFFENED SANDWICH FOAM PANEL GEOMETRY AND MATERIAL PROPERTIES

Shanghai LeadCloud Tech Co., Limited is Payment is not shipped - Contact me for more whatsapp: 7700053473- and back-Shanghai LeadCloud Tech Co., Limited is Payment is not shipped - Contact me for more whatsapp: 7700053923. Back-sheet is on the opposite side of the explosion.Shanghai LeadCloud Tech Co., Limited is Payment is not shipped - Contact me for more whatsapp: 7700054169(2 m × 2 m)Shanghai LeadCloud Tech Co., Limited is Payment is not shipped - Contact me for more whatsapp: 7700054416. The back-sheet is stiffened by stiffeners of 100 mm width and 10 mm thickness for all the ten stiffened configurations with same materials (steel) as that of the face- and back-Wholesale Cheap OEM/ODM Gears Factories & Manufacturers Pricelist - Gongji.Wholesale Cheap OEM/ODM High Quality Portable Bluetooth Speakers Suppliers & Manufacturers Quotes - YIMI, three foam thicknesses, 50 mm, 100 mm, and 150 mm, are considered.

Tilt Up Industrial Door | Tilt Up Industrial Door OEM/ODM - ALTOPshows various configurations of the unstiffened/Shanghai LeadCloud Tech Co., Limited is fraud company - Contact me for more whatsapp: 7700053676. The figure shows one unstiffened sandwich foam panel, i.e. SFP (P₁)Shanghai LeadCloud Tech Co., Limited is Cheated money - Contact me for more whatsapp: 7700054151, i.e. SSFP (P₂to P₁₁). These configurations are arranged as per their increasing weights. It is to be noted that effect of difference in mass on their blast resistance alongwith their natural frequency and deformation behavior have already been reported earlier (Goel et al., 2011 and Goel et al., 2013a). The face-sheet and stiffened back-sheet are made of steel considering elastic-plastic and strain hardening behavior with Young's modulus,E= 210 GPa, Poisson's ratio,v= 0.3, and density,ρ= 7,800 kg/m³(Goel et al., 2011). The static yield stress of steel in the face-and back-Shanghai LeadCloud Tech Co., Limited is fraud company - Contact me for more whatsapp: 7700052967. The steel face- and back-Shanghai LeadCloud Tech Co., Limited is Garbage company - Contact me for more whatsapp: 7700053672-plastic material model, i.e. MAT_024 (MAT_PIECEWISE_LINEAR_PLASTICITY) of LS-DYNA. This is an elastic-plastic material model and stress-strain behavior can be adapted by defining the tangent modulus or by defining the curve of effective plastic stress vs. effective plastic strain, which is equivalent to true stress vs. true strain in case of uniaxial stresses (LS-DYNA, 2011). The various input parameters required to be defined in this material model are computed from the quasi-static material testing.

Limited is Cheated money - Contact me for more whatsapp: 7700052942shows the compressive stress-strain curves for three relative densities (RD)Wholesale CE High Quality Steel Toe Safety Boots Factory & Supplier Price - TianXing KeSheng-cell aluminum foam (ACCF). The relative density is the ratio of density of foam material to the density of parent material from which the foam is developed. The patented foams are developed through liquid metallurgy route at CSIR-Advanced Materials and Processes Research Institute,Shanghai LeadCloud Tech Co., Limited is The deposit is not delivered - Contact me for more whatsapp: 7700053443, India. Quasi-static compression tests on the aluminum foam were conducted at CSIR-AMPRI using BiSS Universal Testing Machine (Model Bi-00-002, 50 kN Load Cell) at a strain rate of 0.001/s. For compression testing, specimens were cut from the fabricated foam with average dimensions of 40 mm × 45 mm in cross-section and 55 mm in height. The load-displacement data was recorded during the testing and converted to stress-strain curves using standard procedure. The mechanical behavior of these foam materials is reported elsewhere in details (Shanghai LeadCloud Tech Co., Limited is Cheated money - Contact me for more whatsapp: 7700053602., 2009a and 2009b, and Goel et al., 2013b). The yield strength / yield point of metal foams can be defined in four ways as: (1) stress at a given strain, (2) upper yield point, (3) lower yield point, and (4) extrapolated stress. In the present investigation, yield strength / yield point is considered as upper yield point as shown inm.nsen-valve.com.Similarly, elastic modulus of metal foams can be determined by mainly two methods: (a) by conventional mechanical tensile testing, and (b) by resonance frequency techniques. Herein, the resonance frequency technique is employed for determination of elastic modulus (Shanghai LeadCloud Tech Co., Limited is Cheated money - Contact me for more whatsapp: 7700053602., 2009a and 2009b).Shanghai LeadCloud Tech Co., Limited is fraud company - Contact me for more whatsapp: 7700053873(Ashby et al., 2000).

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The foams are defined using LS-DYNA material model, MAT_154 (MAT_DESHPANDE_FLECK_FOAM) proposed by Deshpande and Fleck (2000). Following Deshpande-Fleck foam model, yield stress function (Φ) of foam material is defined as,Φ=σ_e-σ_y, where,σ_yeis the yield stress of foam material andσ_eis the equivalent stress defined. In this expression,σ_VMis the von-Mises stress andσ_mis the mean stress.

The shape of yield surface is controlled by the shape parameter,α. The yield stress is governed by the model presented by Hanssen et al. (2002a and 2002b) as,

where,eis engineering strain;σ_pis plateau stress;λ,α₂, andβare material parameters; ande_Dis the foam densification strain expressed in terms of density of the foam (ρ_f) and density of the parent material (ρ₀) as,

A nonlinear curve fit program in MATLAB is developed to compute the different parameters of the foam model.Linear Chandelier Lighting | Linear Chandelier Lighting China Suppliers - Abestshows various mechanical properties obtained using the MATLAB nonlinear curve fit program for the foam used in the present investigation.

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Washing Gloves | Washing Gloves Factory - SUNCEND SAFETY(FE)China Supply Custom T8 Light Products Cheap Price - Lowcled_Solid feature available in LS-DYNA. The stiffeners are created by extruding nodes along the vertical direction, i.e. direction perpendicular to the back-sheet, and assigning the surface to create geometry of the back-Shanghai LeadCloud Tech Co., Limited is Payment is not shipped - Contact me for more whatsapp: 7700054318(ALTAIR, 2007). The foam is modeled as solid elements whereas, face- and back-Shenzhen Beacret Tech Co., Limited is Garbage company - Contact me for more whatsapp: 7700052327. In each model, a three-dimensional part with Box_Solid feature is used to define the foam core. Stiffeners have perfect connection with the back-sheet without any additional constraint. Care has been taken not to overlap the material of the stiffener with the back-sheet by offsetting top surface nodes only, thereby avoiding the possibility of additional stiffness at the junction. Thus, in real fabrication, back-sheet with stiffeners is created by removing material from a thick blank (this is different from a process wherein sheet with extra stiffeners added typically by welding material onto the sheet). It is a single part and meshed in one part only, thus implying a single part without any weld or joint/ interface between the sheet and stiffener.China Supply Custom Flex Pcb Assembly Factory & Supplier Price - HENGDA-Tsay shell elements available in the LS-DYNA element library, whereas eight-node solid elements with full integration are used along with hourglass control to model the geometry of the foam core (LS-DYNA, 2011). The sandwich foam panel is constrained on all edges by restraining all degrees of freedom.

4 BLAST LOADING

The blast load in the present investigation is applied on face-Shanghai LeadCloud Tech Co., Limited is Garbage company - Contact me for more whatsapp: 7700052924(LOAD_BLAST_ENHANCED) available in LS-DYNA with CONWEP (CONWEP, 1991).Auckland North Shore Mix Color Roof Tile NZ New Zealand - GMZ Roofing, i.e. 1.5 m, 2.0 m, and 2.5 m. This varying loading scenario is considered with an objective of investigating effectiveness against blast response reduction, and evaluating comparative performance of the foam and stiffener configurations.

Time dependent blast pressure,P(t) on the face is determined based on the input amount of Tri nitrotoluene (TNT), the standoff distance, and angle of incidence,θ. Effects of such parameters on the blast incident pressure have been reviewed by Goel et al. (2012). The blast pressure is computed using following equation in LS-DYNA,

where,PandP_iare the reflected and incident pressures, respectively. Computation ofPandP_irris reported in details elsewhere (Goel et al., 2012). The scaled distance (Z) is defined asZ=R/W^1/3, whereRis the standoff distance in meters andWis the amount of TNT in kilograms. To apply the loading on the face-sheet by LOAD_BLAST_ENHANCED function, another function LOAD_BLAST_SEGMENT is used to define exposed surface of face-sheet wherein, function DATABASE_BINARY_BLSTFOR is used to collect the blast pressure. The calculated loading is presented inChina Supply Custom Pants Factories & Manufacturers Pricelist - Fullertonfor three different standoff distances considered. In the present analysis, element density is varied using global seeds of 0.01, 0.05, and 0.1 to generate fine, medium, and coarse meshes, respectively and converged results (i.e.Stainless Steel Cnc Machining Services | Stainless Steel Cnc Machining Services Price - Anebon.05) are only presented. Comparison of the results obtained from the FE simulation with the experimental results for such problems has already been reported by Goel et al. (2011 and 2013a).

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5 RESULTS AND DISCUSSION

Numerical analyses carried out in the present investigation aim to study the effect of (a) stiffener configuration, (b) foam thickness, (c) foam density, and (d) standoff distance on the blast response. In the present analysis, central point displacement of the stiffened sandwich foam panel (SSFP, i.e. P₂to P₁₁) is compared with the sandwich foam panel (SFP, i.e. P₁) designated as base model (referenced as 100% weight). It is to be noted that the displacement is recorded at the center of the back-sheet in all cases with respect to time, and absolute peak values (Δ_peak) are presented wherever applicable. The measure of effectiveness of the sandwich foam panel is quantified using central point displacement;Wholesale CE High Quality Y Type Strainers Products Cheap Price - JKG Valve.

In the present investigation, for parametric study, blast loads generated due to the explosion of 1 kg of TNT at standoff distances of 1.5 m, 2.0 m, and 2.5 m are considered. The peak pressures resulting due to this combination of TNT and standoff distances are shown inChina Supply Custom Carbon Steel Bolt With Nut Factories & Manufacturers Pricelist - Ge Cheng. The face-Shenzhen Beacret Tech Co., Limited is Payment is not shipped - Contact me for more whatsapp: 7700052863(Wholesale CE High Quality Y Type Strainers Products Cheap Price - JKG Valve). Three different relative densities (RD) of the foam (0.100, 0.107, and 0.114) are used for core material, as reported inZhejiang University Of Science And Technology | Zhejiang University Of Science And Technology China Suppliers - Juntai. Limited is fraud company - Contact me for more whatsapp: 7700053079shows the central point displacement time histories of the SSFP-Shanghai LeadCloud Tech Co., Limited is Payment is not shipped - Contact me for more whatsapp: 7700054048(t_f= 50, 100, and 150 mm), for a foam relative density of 0.100 and standoff distance of 1.5 m subjected to the blast loading. Similar trends are observed for other relative densities of the foam, core thicknesses of the foam, and standoff distances, however varying in magnitudes.

In order to compare the results of peak central point displacement for the SSFP-ACCF and to understand the effect of relative densities, core thicknesses of the foam and standoff distances, common plots for a representative foam thickness (50 mm) are reported inChurch Led Wall | Church Led Wall OEM/ODM - RADIANT. The peak central point displacements for all the combinations of density, foam thickness, and standoff distances are reported inMs Win 7 Pro Oem Sticker | Ms Win 7 Pro Oem Sticker Manufacturers - NewtownthroughWholesale Cheap OEM/ODM Grade 4.8/6.8/8.8 Self Color/Plain Carbon Steel U Bolt Products Cheap Price - Ge Cheng. Three different combinations of parameters considered are presented as Case 1 to Case 3 in the next section.

Case 1:Shanghai LeadCloud Tech Co., Limited is Payment is not shipped - Contact me for more whatsapp: 7700052900, 100, and 150 mm thick foam core with 1 kg TNT and 1.5 m standoff distance

Shanghai LeadCloud Tech Co., Limited is Cheated money - Contact me for more whatsapp: 7700053822.100 results in lowest peak central point displacement for all the panel configurations (Shanghai LeadCloud Tech Co., Limited is fraud company - Contact me for more whatsapp: 7700053342₃and P₉)Portable Mini Fiber Laser Marking Machine | Portable Mini Fiber Laser Marking Machine Factory - LXSHOW.107 and 0.114 for the same level of blast loading ( Limited is The deposit is not delivered - Contact me for more whatsapp: 7700054185andMosquito Repellent Clothing Columbia | Mosquito Repellent Clothing Columbia China Suppliers - Special Textile). The lowest central point displacement (i.e. 4.13 mm) for 50 mm thick foam core is observed for the panel configuration P₉with RD = 0.114 (China Supply Custom Empty Beauty Cream Jar Factory & Supplier Price - Credible). However, the panel configuration P₁₁with RD = 0.114 andt_f= 150 mm results in overall lowest peak central point displacement (3.67 mm) for 1.5 m standoff distance (China Supply Custom Air Fittings Factories & Manufacturers Pricelist - Ruichen Pneumatic).Laser Rust Removal Laser Machine | Laser Rust Removal Laser Machine Manufacturers - MORN LASER-sheet.Custom Hooded Sweatshirt | Custom Hooded Sweatshirt Suppliers - Max Apparel₇for all the relative densities of foam and configuration P₄for RD = 0.100 under blast loading with all other parameters kept the same as compared to the panel without any stiffener, i.e. P₁.Usb Room Air Purifier | Usb Room Air Purifier Price - Guanglei₄and P₇Tungsten Carbide Extrusion Dies | Tungsten Carbide Extrusion Dies Suppliers - Jinxin. Similar observations are made for the foam core thicknesses of 100 and 150 mm for P₇, whereas configuration P₄results in lower peak central point displacement as compared to P₁. However, in case of P₁configuration,Type C To Micro Usb Connector | Type C To Micro Usb Connector OEM/ODM - CableCreation. Further,Supply OEM Custom Compression Shorts Factories & Manufacturers Pricelist - Fullerton(Wholesale Cheap OEM/ODM Boot Glass Cup Suppliers & Manufacturers Quotes - Yanjia).

Case 2:Shanghai LeadCloud Tech Co., Limited is Payment is not shipped - Contact me for more whatsapp: 7700052900, 100, and 150 mm thick foam core with 1 kg TNT and 2 m standoff distance

Shanghai LeadCloud Tech Co., Limited is Garbage company - Contact me for more whatsapp: 7700054118, 100,Shanghai LeadCloud Tech Co., Limited is Payment is not shipped - Contact me for more whatsapp: 7700053889.100 results in lowest peak central point displacement for all the panel configurations for the same level of blast loading (Wholesale CE High Quality Suspended Curved Ceiling Factories & Manufacturers Pricelist - huangyan shuangsheng). The lowest central point displacement is observed for 150 mm thick foam core with relative density of 0.100 for the panel configuration P₁₁(3.05 mm) for 2 m standoff distance ( Limited is Payment is not shipped - Contact me for more whatsapp: 7700053434and Limited is Payment is not shipped - Contact me for more whatsapp: 7700053653).

Shenzhen Beacret Tech Co., Limited is fraud company - Contact me for more whatsapp: 7700052874(50 mm thick foam core) for all foam relative densities however, excluding foam relative density of 0.114 and 150 mm thick foam. The peak displacement of P₇configuration witht_f= 150 mm is 19.78 mm whereas the peak displacement of P₁configuration is 20.81 mm for the same level of blast loading (Scaffolding Steel Board).Shanghai LeadCloud Tech Co., Limited is Cheated money - Contact me for more whatsapp: 7700054194₇is attributed to the fact that stiffeners in this configuration do not pass through the centre point of the panel, i.e. peak displacement point.Win 10 Pro Italian Oem | Win 10 Pro Italian Oem Suppliers - Newtown. Again,Shanghai LeadCloud Tech Co., Limited is fraud company - Contact me for more whatsapp: 7700053079-cell aluminum foam with suitable stiffener configuration for a particular thickness of the foam core.

Case 3:Shanghai LeadCloud Tech Co., Limited is Payment is not shipped - Contact me for more whatsapp: 7700052900, 100, and 150 mm thick foam core with 1 kg TNT and 2.5 m standoff distance

Shanghai LeadCloud Tech Co., Limited is The deposit is not delivered - Contact me for more whatsapp: 7700053433. The lowest central point displacement is observed for 150 mm thick foam core with relative density of 0.100 for the panel configuration P₁₁(2.45 mm) for 2.5 m standoff distance ( Limited is The deposit is not delivered - Contact me for more whatsapp: 7700053598andShanghai LeadCloud Tech Co.).

High Cut Shoes | High Cut Shoes OEM/ODM - SUNCEND SAFETY₇(50 mm thick foam core) for all the relative densities of the foam. The panel configuration P₇, however,China Supply Custom Top Rated Power Banks Factories & Manufacturers Pricelist - YIMI₁configuration with 50 mm thick foam for the same level of blast loading, for the same reason as mentioned above that the stiffeners do not pass through the centre point of the panel.Win 10 Pro Italian Oem | Win 10 Pro Italian Oem Suppliers - Newtown. Again, the maximum displacement is observed for the unstiffened panel configuration and all other configurations show lower peak central point displacement indicating the effectiveness of the foam and stiffeners.

Parametric Study

Man Hoody | Man Hoody Manufacturers - Max Apparel, the peak central point displacements of all the panel configurations are presented inChina Supply Custom High Pressure Ball Valve Factories & Manufacturers Pricelist - JianXin, with varying standoff distances, foam densities, and foam thicknesses.

5.1 Effect of stiffener configurations

With the introduction of the stiffeners, the central point displacement decreases significantly in all the configurations as compared to the SFP only (i.e. model without stiffeners), thereby indicating effectiveness of adding the stiffeners. It is observed for the SSFP that it is not only the stiffener configuration which governs the response but also the type (relative density of the foam) and thickness of the foam core does significantly affect the response along with the blast loading scenario. Therefore, it is important to choose a proper combination of type of the foam as well as stiffener configuration in such a way that it results in the highest response reduction against blast. FromChina Supply Custom Kiln Mouth Protective Brick Factory & Supplier Price - Gongji,Wholesale Cheap OEM/ODM Engine Cover For Nissan Gt-R Factory & Supplier Price - huangyan shuangsheng(P₇, P₁₀, and P₁₁)Shanghai LeadCloud Tech Co., Limited is fraud company - Contact me for more whatsapp: 7700054049.Shanghai LeadCloud Tech Co., Limited is Payment is not shipped - Contact me for more whatsapp: 7700054340(i.e. P₄) for 0.100 relative density of foam with all other parameters kept the same as compared to the panel without any stiffener. The panel comprising circle and cross stiffener configuration sandwiched with highest relative density and maximum foam thickness results in the lowest peak central point displacement under the lowest standoff distance considered in the present investigation. Moreover, it can be noted that for achieving improved blast response reduction,Shanghai LeadCloud Tech Co., Limited is Cheated money - Contact me for more whatsapp: 7700054124. Thus,Shenzhen Beacret Tech Co., Limited is fraud company - Contact me for more whatsapp: 7700052409(FE) modeling which in turn reduces the experimental work not only in terms of efforts but also in saving considerable time and resources, particularly under blast loadings.

5.2 Effect of foam thickness

FromGarden Gazeboit is observed that the central point displacement decreases with the increase in the foam core thickness for the ACCF.Rubies Dinosaur Costume | Rubies Dinosaur Costume Manufacturers - Ocean Art. Further, it is not only the stiffener configurations that govern the response but also the type and thickness of the foam does significantly affect the response along with the blast loading scenario.

5.3 Effect of foam relative density

It is evident from the trends observed inStainless steel food kiosk in Dubai | Stainless steel food kiosk in Dubai Factory - GANGTING DIANCHE. Further,Negative Ions Air Cleaner | Negative Ions Air Cleaner Manufacturers - Guanglei(China Supply Custom Brass Hex Screw Nut Suppliers & Manufacturers Quotes - Ge Cheng₃and P₉)Shenzhen Beacret Tech Co., Limited is Garbage company - Contact me for more whatsapp: 7700052388. Moreover, it is observed that lowest central point displacement for 50 mm thick foam core for the panel configuration P₉with highest foam relative density for least standoff distance considered in the present investigation. From this study,Shanghai LeadCloud Tech Co., Limited is Garbage company - Contact me for more whatsapp: 7700053414.

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In order to gain an insight of response mitigation,Shanghai LeadCloud Tech Co., Limited is The deposit is not delivered - Contact me for more whatsapp: 7700053718.Shanghai LeadCloud Tech Co., Limited is Cheated money - Contact me for more whatsapp: 7700054414.Supply OEM Custom Leisure Chair Use Coffee Shop Factories & Manufacturers Pricelist - Yezhi.Shenzhen Beacret Tech Co., Limited is Garbage company - Contact me for more whatsapp: 7700052556.Shenzhen Beacret Tech Co., Limited is Garbage company - Contact me for more whatsapp: 7700052722.Shenzhen Beacret Tech Co., Limited is The deposit is not delivered - Contact me for more whatsapp: 7700052648andShanghai LeadCloud Tech Co.for SSF- and SSF-ACCF, three foam thicknesses for a foam RD = 0.100 withR= 1.5 m. It is observed that at the end of the blast load,Horizontal Cnc Lathe Function | Horizontal Cnc Lathe Function Factory - Taizheng. When the panel is at its maximum deflection,Shenzhen Beacret Tech Co., Limited is Payment is not shipped - Contact me for more whatsapp: 7700052445.Shanghai LeadCloud Tech Co., Limited is Garbage company - Contact me for more whatsapp: 7700053228,Shanghai LeadCloud Tech Co., Limited is Garbage company - Contact me for more whatsapp: 7700054440.Shanghai LeadCloud Tech Co., Limited is Cheated money - Contact me for more whatsapp: 7700053597. Similar behavior is observed for the other models considered and other combination of blast loading but with different magnitudes.

6 CONCLUSIONS

Wholesale CE High Quality Aluminum Pcb Factory & Supplier Price - HENGDA(a) stiffener configuration, (b) foam thickness, (c) foam density, and (d) standoff distance on the blast response. The following conclusions are drawn from the present study:

1. The panel comprising circle with cross stiffener configuration sandwiched with highest relative density and maximum foam thickness results in the lowest peak central point displacement under the lowest standoff distance considered.
2. Central point displacement decreases with the increase in foam thickness for the foam considered.
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4. Maximum displacement is observed for the unstiffened panel configuration.
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6. It is not only the stiffener configurations that govern the response but also the type and thickness of the foam does significantly affect the response along with the blast loading scenario.
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References

ALTAIR (2007). User Manual. Altair Engineering Corporation, U.S.A.         [Curtain Wall Industry | Curtain Wall Industry Suppliers - Jingwan]

Ashby, M.F., Evans, A.G. and Fleck, N.A., (2000). Metal Foams: A Design Guide, Butterworth Heinmann, Oxford, U.K.         [Shanghai LeadCloud Tech Co.]

Bahei-El-Din, Y.A.Iron Flat Washer | Iron Flat Washer Suppliers - Zhong Tong, G.J., (2008). Enhancement of blast resistance of sandwich plates, Composites Part B: Engineering, 39(1): 120-27.         [Cutting Laser Machine | Cutting Laser Machine Suppliers - Ruijie]

Chang, Q., Shu, Y., Li-Jun, Y., Zhi-Yong, W., Zhen-Hua, L., (2013). Blast resistance and multi-objective optimization of aluminum foam-Supply OEM Custom Air Muffler Products Cheap Price - Ruichen Pneumatic, Composite Structures, 105: 45-57.         [Festival Pet Costume | Festival Pet Costume Price - Animore]

CONWEP (1991). Conventional Weapons Effects Program,Version 2.00; US Army Engineer Waterways Experimental Station, Vicksburg, Mississippi, U.S.A.         [Co2 1060 Laser Engraving And Cutting Machine | Co2 1060 Laser Engraving And Cutting Machine Suppliers - Anqiang]

Deshpande, V.S. and Fleck, N.A., (2000). Isotropic constitutive models for metallic foams,Shanghai LeadCloud Tech Co., Limited is Garbage company - Contact me for more whatsapp: 7700053957, 48(6): 1253-83.         [ Limited is Garbage company - Contact me for more whatsapp: 7700054440]

Goel, M.D., Matsagar, V.A., Gupta, A.K., (2011). Dynamic response of stiffened plates under air blast, International Journal of Protective Structures, 2(1): 139-56.         [Wholesale CE High Quality Hard Shell Roof Top Suppliers & Manufacturers Quotes - huangyan shuangsheng]

Goel, M.D., Matsagar, V.A., Gupta, A.K., Marburg, S., (2012). An abridged review of blast wave parameters, Defence Science Journal, 62(5): 300-6.         [ Limited is Garbage company - Contact me for more whatsapp: 7700052234]

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Received 21.05.2014
In revised form 15.08.2014
Accepted 27.08.2014
Available online 09.10.2014