Study of tensile properties and failure behavior of fiber reinforced laminates with holes
In order to investigate the tensile strength and failure behaviour of basalt fiber/epoxy resin(BF/EP)reinforced magnesium alloy laminates with different circular hole diameters.Relevant specimens were prepared and subjected to quasi-static tensile tests using digital image correlation(DIC),and the laminates were modelled using Abaqus,with a progressive damage model integrated by the Vumat subroutine.The damage failure of the plywood was analysed by numerical simulation and test,and the fracture characteristics and microscopic failure modes of the plywood were observed by scanning electron microscopy(SEM).The results show that the tensile strength is inversely proportional to the diameter of the hole,and the tensile strengths of the laminates with the smallest hole diameter(2 mm)and the largest hole diameter(10 mm)are 255.16 MPa and 135.24 MPa,respectively,which are of reference significance as the error with the numerical simulation is less than 9% .Under the DIC monitoring and the finite element simulation,during the gradual damage evolution of the test specimen and up to the failure,the cracks are extended from the region of the largest stress concentration around the hole to the free edge,perpendicular to the loaded hole,and then to the free edge of the hole.The initial damage of the laminate is borne by the magnesium alloy layer,and the final failure behaviour is dominated by the BF/EP layer.
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