Single and Multisite Impact Response of S2-Glass/Epoxy Balsa Wood Core Sandwich Composites

Vaidya, Uday; Deka, L. J.

doi:10.1007/978-90-481-3141-9_21

Cited by 6 publications

(10 citation statements)

References 26 publications

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“…Wood material model, Mat 143 that exhibits transversely isotropic property is applied to the core elements. Softening and fracture parameters are not considered which are available in this material model [30], as it needs more research on balsawood. Yield criteria are formulated parallel and perpendicular to the grain from tensile, compressive and shear strength of balsa in parallel and a perpendicular direction to the grain.…”

Section: Wood Constitutive Materials Modelmentioning

confidence: 99%

Experimental and Numerical Investigation of Impact Characteristics of the E-Glass/Toughened Vinylester Composite Car Hood Panels

Dhaliwal

Newaz

2016

J. dynamic behavior mater.

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This study involves experimental and numerical investigation on the impact response of a section of typical car hood having reinforcement in its inner layer containing a common X-shaped hat section. The hood specimens were developed by utilizing E-glass/Vinylester prepreg. The effect of stiffening the inner layer's reinforcement region by placing a balsawood layer in the X-shaped hat section was also studied. Impact test was performed by driving the impacting pendulum by using the pneumatic device at a velocity of 4.1 m/s to evaluate the impact response of the composite hood panels having balsawood layer and of those without it. Impact test results; load-time, displacement-time, load-deflection history from experimental is presented at 200 kJ impact energy. Explicit finite element analysis was performed by utilizing commercially available LS-Dyna code. The computational model was developed to predict the response of both types of composite car hood panels under dynamic loading. A comparison of the experimental results i.e., deflection-time, load-time histories and kinetic energy with FEA results for both types of composite car hood panels was made. Results correlate well and form the basis for analyzing and designing such new lightweight material systems for automotive applications.

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Section: Wood Constitutive Materials Modelmentioning

confidence: 99%

Experimental and Numerical Investigation of Impact Characteristics of the E-Glass/Toughened Vinylester Composite Car Hood Panels

Dhaliwal

Newaz

2016

J. dynamic behavior mater.

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“…[17][18][19][20][21][22][23][24][25][26] Ballistic penetration resistance of a target-projectile pair can be quantified by experimentally determining the ballistic limit velocity (V 50 ) and the ballistic limit energy (E 50 = (1=2)m P V 2 50 ). 27 Penetration resistance can also be quantified by the penetration resistance force acting on the projectile as a function of time and by studying the projectile dynamics which will require the use of an explicit finite element analysis (FEA) procedure.…”

Section: Introductionmentioning

confidence: 99%

Multi-hit ballistic impact on S-2 glass/SC15 thick-section composites: finite element analyses

Haque

Harrington

Gillespie

2012

The Journal of Strain Analysis for Engineering Design

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The effect of support spans on single-hit ballistic limit and the effect of pre-existing ballistic damage on multi-hit ballistic limit for two S-2 glass/SC15 composite laminate thicknesses (i.e. 13.6 mm and 20.5 mm) using 0.50cal fragment simulating projectiles have been experimentally investigated in a companion paper. The main objective of this paper is to simulate and correlate the multi-hit ballistic experiments using finite element analyses. One multi-hit ballistic impact scenario on two different composite laminate thicknesses is considered in the present analyses. Finite element model of the impact scenario is developed using three-dimensional solid elements and are solved using LS-DYNA and the progressive composite damage model MAT162. The MAT162 properties and parameters of plain-weave S-2 glass/SC15 composites used in the present simulations were validated in our previous work. Multi-hit impact cases are simulated by sequentially impacting the composite laminate with five different fragment simulating projectiles at five different impact locations at an interval of 200 micro-seconds. Good correlations of ballistic limit velocities between experiments and finite element analyses are obtained. In addition, finite element analyses provided time histories of projectile and laminate dynamics, and damage evolution and interactions for the multi-hit impact cases. Detailed simulation results and comparison with the experiments are presented.

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“…1 In these fields, composites are often prone to high velocity impact, not only in one single impact incident, but also multiple sequential or simultaneous impact events through the duration of their use. 2–7 During single-hit or multi-hit impact events, structural stiffness, strength, and penetration resistance of composite structures may be significantly reduced. Other factors that affect the damage mechanisms and penetration resistance of a composite laminate are layer thickness of a composite 8,9 as well as support span diameter.…”

Section: Introductionmentioning

confidence: 99%

“…When a pre-impacted composite is struck by a new projectile, the damage from this new impact overlaps with the damage of the previous one, experiencing progressive damage and further weakening the composite in that area. 2–4 Deka et al 2,3 investigated both 2 and 3 projectile impact scenarios, implementing simultaneous and sequential multiple impacts on 2.0 mm thick S-2 glass/SC15 composites. They found that the delamination damage is greater in sequential impact over simultaneous.…”

Section: Introductionmentioning

confidence: 99%

Multi-hit ballistic impact on S-2 glass/SC15 thick-section composites: experiments

Haque

Harrington

Gillespie

2012

The Journal of Strain Analysis for Engineering Design

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Multi-hit ballistic impact and damage behavior of thick-section composites are of interest to many military and aerospace applications. The effect of support spans on single-hit penetration resistance and the effect of relative distance between multiple impacts on the penetration resistance are the subject matter of the present investigation. In order to study the effect of support spans on penetration resistance, single-hit ballistic experiments are conducted on two plain-weave (PW) S-2 glass/SC15 composite laminates of thickness, 13.5 mm (22 layers, 22L) and 20.4 mm (33 layers, 33L), respectively at two different support span diameters, i.e. 102 mm and 203 mm. On the other hand, the effect of multiple impacts on penetration resistance has been investigated by impacting both the laminates (22L and 33L) at four additional radial shot locations (90 degrees apart) with a support span diameter of 203 mm. In both the impact scenarios, 0.50cal fragment simulating projectiles (0.50cal FSP) were used while the composite laminates were clamped between a cover and a support plate. In addition, the maximum dynamic deflection of the composite laminates were recorded using a thin aluminum witness plate at the rear end of the laminate, and the through-thickness ballistic damage of the composite laminates was investigated by sectioning through the impact centers, dying with an ink-alcohol solution, and taking optical photographs of the cross-sections.Results show that the single-hit ballistic limit velocity increases marginally with support span diameter investigated. The curvatures of the dynamic deflection profiles at the support edge suggest that the dynamic deflection was constrained by the smaller support span while the dynamic deflection was not constrained by the larger support span. There was no noticeable difference in the single-hit maximum dynamic deflection between the two laminate thicknesses as a function of impact velocity to ballistic limit velocity ratios. Single-hit through-thickness damage extended toward the edges of the larger support spans such that the subsequent multiple impacts were on partially damaged laminates; however, the pre-existing ballistic damage showed about 4.5% and 9.0% decrease in site specific multi-hit ballistic limit and energy, respectively.

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Single and Multisite Impact Response of S2-Glass/Epoxy Balsa Wood Core Sandwich Composites

Cited by 6 publications

References 26 publications

Experimental and Numerical Investigation of Impact Characteristics of the E-Glass/Toughened Vinylester Composite Car Hood Panels

Experimental and Numerical Investigation of Impact Characteristics of the E-Glass/Toughened Vinylester Composite Car Hood Panels

Multi-hit ballistic impact on S-2 glass/SC15 thick-section composites: finite element analyses

Multi-hit ballistic impact on S-2 glass/SC15 thick-section composites: experiments

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