This study mainly focused on how one layer of fiber fabric can increase the energy absorption and post-damage behaviors of composite structures. For this purpose, the low velocity and compression after impact behaviors of thermoplastic matrix composite materials were experimentally investigated. A total of 0.1%-0.3% maleic anhydride grafted polypropylene and 0.3%-0.5% maleic anhydride grafted acrylonitrile butadiene styrene polymers were used as the matrix materials, whereas only single-layer plain weave aramid fiber, carbon fiber, and glass fiber fabric were used as the reinforcement materials. The impact tests were conducted at the energy values of 20, 50, and 80 J. The results showed that the aramid fiber increased energy absorption on every level of impact energy for both matrix materials, while the carbon and glass fiber fabrics only increased the energy absorption of the MA-g-ABS matrix. They negatively affected the energy absorption of the MA-g-PP polymer. No reinforcement materials had any contribution to the maximum CAI strength value of the two matrix materials, especially in the MA-g-ABS composites, while all reinforcement materials increased the maximum strain values of MA-g-ABS up to 75%. They did not increase the CAI strain values of MA-g-PP due to the flexible structure of polypropylene.
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).
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