چكيده به لاتين
Composite materials are recently used widely in various structures such as turbines, rockets, armor, buildings, and other applications due to their high strength, resistance to corrosion, and efficient use. Moreover, many applications of composite materials are related to impact applications. For example, aircraft, military equipment, and marine structures undergo high pressure in high velocity or explosive situations, so it is essential to be aware of the mechanical behavior of composites materials under dynamic loadings. EDifferent methods measure the strain rate dependence of composite materials. One of these methods is the Hopkinson compression machine, an appropriate tool for studying materials' dynamic behavior in high strain rates between 〖10〗^2 s^(-1) and 〖10〗^4 s^(-1).
In this research, the design principles of the Hopkinson compression system for composite samples are mentioned. The Hopkinson compression machine made of marginal steel with sticker bars, incident bars, and transmitted bars with lengths of 100 mm, 600 mm, 600 mm, and 10 mm diameter was simulated by ABAQUS / Explicit software. The experiments of three polymer matrix composites samples included S-2 glass/sc15 epoxy, Flax-epoxy, and E-glass/vinyl ester through the thickness was simulated by the designed Hopkinson compression machine. To create the appropriate incident waveform and to establish the condition of constant strain rate and dynamic stress equilibrium, the significant parameters of pulse shaper included diameter, thickness, and the length of the sticker bar was investigated. By comparing the waves obtained from the simulations with the research done on these composite samples by other researchers and their compatibility, it is clear that the Hopkinson compression device's design is correct.
