A numerical and experimental investigation on quasi-static punch shear test behavior of aramid/epoxy composites

• Published in: Polymers & polymer composites Vol. 28; no. 6; pp. 398 - 409
• Main Authors: Ayten, Ali İmran, Ekici, Bülent, Taşdelen, Mehmet Atilla
• Format: Journal Article
• Language: English
• Published: London, England SAGE Publications 01-07-2020; Sage Publications Ltd
• Subjects: Boundary conditions; Composite materials; Compression tests; Computer simulation; Epoxy resins; Failure mechanisms; Failure modes; High density polyethylenes; Mathematical models; Mechanical tests; Model testing; Polyethylene; Shear strength; Shear stress; Shear tests; Velocity; numerical modelling; Polymer matrix composites; quasi-static punch shear test; damage mechanics
• ISSN: 0967-3911; 1478-2391
• DOI: 10.1177/0967391119881554

In this study, quasi-static punch shear behavior of aramid epoxy composites was investigated both numerically and experimentally. Firstly, material model parameters used in numerical simulations were obtained by various mechanical tests such as tensile, compression, and in-plane shear tests. Different damage mechanisms that were observed during each test were the focus of interest. Then quasi-static punch shear test was performed and verified with numerical simulations. After the verification of material model, punch tests, which have different boundary conditions, were run numerically, and the effect of thickness and span-to-punch ratio (SPR) were determined for aramid/epoxy composites. It is concluded that failure mechanisms of composite samples were related to SPR. When SPR increases, the failure mode was shifted from shear-dominated failure to bending-dominated failure behavior. Additionally, punch shear strength value at minimum SPR (1.1) was eight times bigger than the value at maximum one (8).