Behavior of E-glass composite laminates under ballistic impact

Reddy, Pramod; Reddy, T. Sreekantha; Madhu, V.; Gogia, A.K.; Rao, K. Venkateswara

doi:10.1016/j.matdes.2015.06.094

Cited by 66 publications

(17 citation statements)

References 22 publications

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“…It is uncertain whether the 22% increase in the penetration energy is due to the presence of the MWNT/epoxy nanofibres and particles or the increased thickness (by 15%) of the glass fibre fabric-electrospun MWNT/Araldite-epoxy laminate against the plain glass fibre fabric-epoxy laminate. Rama Subba Reddy et al [37] reported the relation between the penetration energy, Ep (in J), and the laminate thickness, H (in mm): Ep = 10.83 H 1.457 for a glass fibre-phenolic laminate, which would lead to a similar increase of absorbed energy as in this study. However, a 15% laminate thickness increase for 22% greater penetration energy would also mean a 15% increase in the mass of the glass fibre-epoxy laminate, whereas in the present study the MWNT interlayers of the glass fibre fabric-electrospun MWNT/Araldite-epoxy laminate brought only a 3.7% mass increase.…”

Section: Discussionsupporting

confidence: 75%

Hybrid Woven Glass Fibre Fabric-Multi-Walled Carbon Nanotube-Epoxy Composites Under Low Rate Impact

2017

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This research work addresses the issue of developing light composite materials with increased ability for impact energy absorption. Novel, hybrid plain woven glass fibre fabric-epoxy laminates with multi-walled carbon nanotube (MWNT) interlayers were fabricated in this study so that (a) only a few MWNT interlayers were placed close to the face of the laminate to be subjected to impact and (b) the interlayers were fabricated via innovative wide-line electrospinning of MWNT/epoxy/solvent solutions, depositing a mixture of aligned fibres and spray on the woven glass fibre fabrics; the laminate was then fabricated via resin transfer moulding (RTM). Hybrid nano-micro-composite laminates with 0.15 wt% MWNT were prepared with this method and were subjected to single low rate impact tests. It was found that the optimised hybrid laminates had 22% greater total penetration energy translated to 15% weight reduction in the laminate armour for an equivalent amount of energy penetration.

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Section: Discussionsupporting

confidence: 75%

Hybrid Woven Glass Fibre Fabric-Multi-Walled Carbon Nanotube-Epoxy Composites Under Low Rate Impact

2017

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“…Both of laminate and patch are meshed with the reducedintegration linear 8-node brick elements (C3D8R). According to previous studies, the deformation of projectile can be negligible under the case of thinner laminate and lower ballistic velocity (Reddy et al, 2015). Hence, the steel projectile is modeled as a rigid body and meshed with the discrete rigid element (R3D4).…”

Section: Finite Element Modelingmentioning

confidence: 99%

Damage and perforation resistance behaviors induced by projectile impact load on bonding-patch repaired and scarf-patch repaired composite laminates

Jiang

Zhang

Liu

et al. 2018

International Journal of Damage Mechanics

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A three-dimensional continuum damage model is proposed to analyze the damage and perforation resistance behaviors of bonding-patch and scarf-patch repaired composite laminates under projectile impact load. Coupling with modified 3D-Hashin failure criteria, a linear-exponential law due to fiber pull-out failure and an exponential law are used to predict tensile and compressive softening processes of materials, respectively. A cohesive interaction based on triangle traction–separation law and mixed-mode fracture energy method is applied for interface debonding damages between patch/lamina, patch/patch and lamina/lamina. Comparisons are made between numerical results and several available test data for different impact offsets. The perforation resistance and interface debonding damage mechanisms are extensively discussed using finite element analysis. Further, perforation resistance behaviors of laminate with six different patch-repair patterns are assessed. Effects of initial velocity of projectile on residual velocity and energy-absorption are discussed. A residual velocity error within 7.3% and energy-absorption error within 9.2% is found between simulations and tests. Consistent failure modes including fiber fracture, matrix cracking, delamination and interface debonding are also identified. As the projectile invades patches, interface debonding damage in patches is accumulated rapidly, especially for larger impact offset. The combined patch-repairs show a reduction of at the most 48.3% in velocity and higher ballistic limit velocities which implies better perforation resistance capacity. The energy-absorption almost increases with increasing the initial velocity and a decreasing trend in average energy-absorption is found with the increase of impact offset.

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“…Residual velocities of the projectile and ballistic limits of the targets have been predicted from the simulations. The results have been compared with various analytical models and with the results of experiments reported elsewhere (Reddy et al, 2015). The damage mechanisms mainly two stage damage mechanism, delamination and matrix cracking etc., and wave propagation phenomena in the target material have been studied and compared with the results of experiments and analytical models.…”

Section: Introductionmentioning

confidence: 99%

Numerical prediction of damage mechanisms of E-Glass/epoxy composite material against ballistic impact of 7.62 MS projectile

Bodepati

Madhu

2020

International Journal of Protective Structures

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The fibre reinforced polymer matrix composite materials have acquired more credibility over other materials like metals and ceramics due to their high specific strength. Numerical simulations of ballistic impact of 7.62 mild steel projectile on various thicknesses of plain woven E-Glass/epoxy composite material were performed. Residual velocity and ballistic limit of the composite material were determined numerically and the results are compared with that of experiments published elsewhere. The numerical and experimental results are in good agreement. The numerical results are also compared with Recht-Ipson (R-I) and Gellert et al analytical models and are found to be in good correlation. Various failure mechanisms such as two stage damage mechanism namely dishing in target materials less than 10mm and indentation followed by dishing in target materials greater than 10 mm, delamination, and fibre and matrix failure modes of the composite material were studied and compared with the analytical models and experimental results. The wave propagation mechanisms and the damage phenomena are also studied and correlated.

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Behavior of E-glass composite laminates under ballistic impact

Cited by 66 publications

References 22 publications

Hybrid Woven Glass Fibre Fabric-Multi-Walled Carbon Nanotube-Epoxy Composites Under Low Rate Impact

Hybrid Woven Glass Fibre Fabric-Multi-Walled Carbon Nanotube-Epoxy Composites Under Low Rate Impact

Damage and perforation resistance behaviors induced by projectile impact load on bonding-patch repaired and scarf-patch repaired composite laminates

Numerical prediction of damage mechanisms of E-Glass/epoxy composite material against ballistic impact of 7.62 MS projectile

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