Failure Mode Analysis of Stiffened Plates with Initial Cracks under Repeated Impacts
Repeated impact tests of stiffened plates with initial cracks were carried out and effects of the crack length and location on the failure mode were investigated.Combined with numerical simulation,failure modes of stiffened plates with initial cracks were analyzed.The results show that the cracks make a difference in the failure modes of the stiffened plates by altering the distribution of its plastic region and thus affecting the absorption of the structural energy.Under certain impact energy,the failure mode of the plate is not only manifested as global large plastic deformation but also accompanied by local or entire component fracture.When the initial crack is located in the outer plate,the crack tip opening distance increases linearly with the accumulation of plastic deformation in the center of the stiffened plate,and the increase rate is positively correlated with the crack length.The crack tip opening can lead to the occurrence of local small-scale fracture.When the initial crack is located in the free edge of the stiffener,the crack gradually expands with repeated impacts until the stiffener completely fractures.The research results can provide a reference for the design of impact safety for engineering structurers.
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