Crashworthiness Performance of Carbon Fiber Composite (CFC) Vehicle Front Bumper Crush Can (FBCC) Assemblies Subjected to High Speed 40% Offset Frontal Impact

Dixit, Y.; Begeman, Paul C.; Dhaliwal, Gurpinder S.; Newaz, G.; Board, Derek; Chen, Y.

doi:10.1115/imece2017-70357

Cited by 7 publications

(2 citation statements)

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“…Daniel and Abot [7] implemented special techniques to prevent premature failure under the loading pin by reinforcing the core with epoxy. Complex behavior of sandwich composites due to the effect of inter-laminar shear response, the use of bi-modulus materials, and the effect of material models in LS-Dyna are studied in literature [8][9][10][11][12][13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Effect of padding on flexural response of sandwich composites

Newaz

Dhaliwal

Phadatare

et al. 2019

Jnl of Sandwich Structures & Materials

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Under flexural loading, premature indentation of face sheet is a major concern in sandwich-structured composites with a softer core. A composite material having sandwich structure is a special class of composite materials that is developed by adhesively bonding two thin but stiff skins to a lightweight but thick core. ASTM C393 standard recommends the use of a wider load pad under the loading pin to ensure distribution of concentrated load [ 21 ]. However, it does not address how padding influences the overall flexural behavior of sandwich composites. This investigation focuses on evaluating the effect of padding by comparing flexural tests of sandwich beams with and without padding. Rubber and Teflon materials are used as padding, which are adhesively bonded in the sandwich composite beams. Results show that flexural stiffness and peak load carried by the beams are not affected, but the failure modes can change significantly due to load-point padding. More significant core collapse (failure) in the padded case is the key difference in failure modes between the padded and unpadded cases. This change in failure mode requires careful attention, particularly, for the development of a proper test standard. We conducted finite element analysis, which clarifies the stress distribution in the face sheets and in the core due to padding as well as when padding is absent. Finite element analysis results show that greater volume of the core material is subjected to higher level of von Mises stresses, which occurs in the padded case, increasing the probability of core failure. High shear zones are also observed in the case of padding, and balsawood core cracking is consistent with these high shear zones. Results from this investigation shed light on current experimental methods and consequence of padding in altering failure modes and eventual load-deflection response in sandwich composites subjected to flexural loading.

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Section: Introductionmentioning

confidence: 99%

Effect of padding on flexural response of sandwich composites

Newaz

Dhaliwal

Phadatare

et al. 2019

Jnl of Sandwich Structures & Materials

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“…CARALL laminates approximately show 10% higher tensile strength than GLARE [21] for the same fiber volume fraction. FMLs with carbon fiber, commonly known as CARALL, offers better crashworthiness [22,23], higher energy absorption, high specific modulus, better yield strength, and excellent fatigue resistance as compared to glass or aramid fiber reinforced aluminum laminates [24,25]. Thus, carbon fiber reinforced FMLs can be very attractive for the automotive industry to develop lightweight automobiles.…”

Section: Introductionmentioning

confidence: 99%

Effect of Resin Rich Veil Cloth Layers on the Uniaxial Tensile Behavior of Carbon Fiber Reinforced Fiber Metal Laminates

Dhaliwal

Newaz

2018

J. Compos. Sci.

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The influence of stacking sequence and resin rich (polyester veil cloth) layers, which were used to improve the adhesion between carbon fiber/epoxy (CFRP) and aluminum layers (AL), on the uniaxial tensile response of carbon fiber reinforced aluminum laminates (CARALL) was investigated in this research study. The metal volume fraction was varied to prepare two types of CARALL laminates having a 3/2 configuration with the help of a vacuum press without using any adhesive film. Numerical simulations were performed by utilizing commercially available finite element (FE) code, LS-Dyna to predict the tensile response of these laminates with initialization of predicted thermal residual stresses that developed during curing of laminates. Delamination failure was considered in the numerical simulation by utilizing the well-known B-K mixed-mode damage propagation model. It was found that addition of epoxy resin rich (polyester veil cloth) layers used for enhancement of interfacial bond adhesion and to ensure no separation between AL-CFRP layers increased the tensile strength of CARALL laminates.

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