Cohesive element is developed from the Dugdal-Barenblatt model in the field of fracture mechanics.The mechanical constitutive relation of cohesive element can be artificially assumed depending on the specific applications.It has been successfully applied in the study of crystal plasticity/brittle fracture process and decohesion between delaminations.In this paper,tensile experiments of large steel plate with different length of pre-existing cracks are conducted.Based on commercial software ABAQUS,cohesive element is adopted to simulate the tensile tests,and appropriate parameter values are obtained by fitting displacement-force curves.Using these parameters,a numerical method is presented by applying cohesive element to thermo-elastic-plastic finite element method(TEP-FEM) to simulate plate rigid restraint cracking(PRRC) Jests.By changing constitutive relation of cohesive element,dimensions of the model and welding conditions,the influence of welding restraint intensity and welding conditions on the crack propagation are discussed,respectively.Three types of welding cold cracking are simulated.Significant influence of welding cold cracking on resistant stress in welding line is captured by this numerical method.
展开▼
