金属材料动态剪切测试方法

The dynamic shear performance parameters of materials are the important basis for the design of missiles, rockets and armor protection systems. However, there are still problems in the stress uniformity and force state of existing tensile shear specimens, which affect the reliability of test results. Five kinds of tensile shear specimens were compared and analyzed by numerical simulations. In order to solve the existing problems, a new type of tensile shear specimen was designed. The stress distribution of the new specimen is uniform for both quasi-static and dynamic loading conditions, and the stress state is close to pure shear, which is suitable for the accurate testing of shear mechanical properties of materials in large ranges of strain rate and strain. Compared with the test results of double shear specimens (DSS) under compressive loading, it was found that the stress-strain curves were in good agreement, and the new specimen had a longer plastic flow stage. Moreover, numerical simulations were performed to study the deformation and fracture processes of the TC4 titanium alloy specimen, and good consistency was observed between the simulation results and the images taken by the high-speed camera. Therefore, the validity of the specimen design and numerical simulation results is further verified.