DEVELOPMENT AND SIMULATION ANALYSIS BY FEM OF THE PENDULUM IMPACT TENSILE TEST APPARATUS OF BAR-BAR

On the basis of the fully investigating SHTB apparatus at home and abroad, the pendulum type indirect bar-bar SHTB apparatus has been developed with the low cost. The powerplant is constituted by a transformed pendulum machine, the key technologies of generating incident square waves. The pendulum’s unadjusted velocity is 5m/s, and the energy is 300J. The impacting block and incident bar are connected by a short metal bar whose material is LY12cz. The short metal bar transits fast from the elastic deformation to the plastic deformation until t breaking when the pendulum impacts the block, and the incident wave is not produced by the pendulum impacting the block but used the short metal bar’s plastic flow process. The incident wave’s width and amplitude are decided by the short metal bar’s dimension. The energy transmitted from the pendulum machine to incident bar is fully adjusted and controlled. The range of strain rate is from 100/s to 1600/s in the test sample. The key structure of SHTB apparatus is introduced. Associating a 16MnR material performance experiment, the square stress-wave in the bar’s tension spreading process is analyzed; the strain rate and stress-strain relationship is given for this test sample. The stress-strain relation obtained on self-developed SHTB apparatus of the titanium alloy welding material and stainless steel and a 16MnR composite board welding material is simply introduced. The formed process of the bar’s short break and incident waves is simulated by the software Ansys Ls-dyna. The generating principle of incident waves is analyzed deeply. The beneficial instruction for the short bar and specimen’s test design is proposed. The advantage of self-developed SHTB apparatus is a simple structure and of low cost.