The loads, stress and strain state of the ship structures are quite complicated under the condition of collision and grounding, etc. The failure criteria which are commonly used in numerical simulations of ship collision can't accurately represent the failure characteristics of hull steel under complicated stress. The ship plates absorb the most energy in the process of collision. The rupture of ship plates will cause huge damage in hull extremely easily. Complex stress in plate is mainly simplified as biaxial stress. Experiments were conducted to study the failure characteristics of high-strength hull steel under biaxial stress. Six different shapes of specimens were designed to study the influence of different biaxial stress. The specimens were loaded until destruction under quasi-static loading with a hemispherical indenter. The loading force and displacement of specimens in the midpoint were recorded. The Constant strain (CS) criterion, the BWH criterion and a modified BWH (m-BWH) criterion were used to simulate the experiment process in FE models. Simulation results show that the BWH criterion is in better agreement with the experiment results than the constant strain criterion, but the errors increase with strain ratio. The modified BWH criterion improves the accuracy when the strain ratio is high.
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