Strain-rate-dependent failure criteria for composites

摘要: Abstract The objective of this study was to characterize the quasi-static and dynamic behavior composite materials develop/expand failure theories describe static under multi-axial states stress. A unidirectional carbon/epoxy material investigated. Multi-axial experiments were conducted at three strain rates, quasi-static, intermediate high, 10−4, 1 180–400 s−1, respectively, using off-axis specimens produce stress combining transverse normal in-plane shear stresses. Hopkinson bar apparatus loaded in system used for characterization high rates. Stress–strain curves obtained rates mentioned. measured strengths evaluated based on classical criteria, (maximum stress, maximum strain, Tsai–Hill, Tsai–Wu, mode partially interactive criteria (Hashin–Rotem, Sun, Daniel). latter (NU theory) is primarily applicable interfiber/interlaminar including NU theory expressed terms subcriteria presented as a single normalized (master) envelope rate effects. shown be excellent agreement with experimental results.