Stress state response of compresive shear plane strain specimens
To simulate the plane strain characteristic of the compressive shear stress state in metal plastic deformation,a plane compres-sive shear specimen was constructed.The stress state distribution characteristics in the Y-direction of deformation zone and the compres-sion fracture process were characterized by digital image correlation(DIC)technology and finite element simulation.DIC results show that the strain field distribution in deformation zone is in good agreement with the finite element results during the compression experiment process,and the finite element results are reliable.The finite element results show that the stress triaxiality can be controlled quantitatively by changing the notch dip angle of the specimen,and the principal strain direction is consistent with the notch dip angle direction.In the Y-direction of the deformation zone,compressive shear occurs within the plane strain.At the same time,the edge position of the sample has a lower Lode angle parameter compared with the central position,and has the characteristics of bidirectional compression loading,which increases the hydrostatic pressure and further reduces the stress triaxial degree to-0.823.
万方数据
维普
