3D numerical calculation of damage accumulation for composite single bolted joint

A three-dimensional progressive damage model was developed to predict the response of composite laminates with single bolt using the user subroutine UMAT in FEA(finite element analysis) software ABAQUS. Base on the degradation criteria proposed by Tan, the maximum stress criterion, Hashin failure criterion and the analyses criterion combining the both were employed to simulate the progressive damage model in bolted joint respectively. The influence of the fastener stiffness was also considered. The experiment data was compared with the predicted result. It appears that maximum stress criterion is fit for the joint structure that the tensile damage is the main failure mode, and Hashin failure criterion for the joint structure failed mainly by shear load. Fastener's stiffness only influence on the stiffness of structure, not the failure strength.