Study on preparation and stiffness of NiTi shape memory alloy/2A12 aluminum alloy laminated structure

The laminated structure of NiTi shape memory alloy (SMA) and 2A12 aluminum alloy was prepared, and the structural stiffness was studied by simulation and experiment. Orthogonal experiments were used to study the influences of process parameters on the quality of laser edge sealing welding, and the maximum fracture load was 148.65 N/mm. Then the driving ability of NiTi SMA was tested, and the result was about 14,000 N. Finally, the influences of position and number of NiTi SMA on the structural stiffness were studied, and the optimal layout of the structure was obtained. L₂ = 120 mm and L₃ = 240 mm were the optimal layout of the 2A12 aluminum alloy/NiTi SMA laminated structure. According to the actual test results, the improved effect of stiffness was 203.4%. Compared with the test results, the simulated results for the natural frequency of laminated structure had some relative error. The reason may be that the non-recoverable strain occurred during the driving process of NiTi SMA, which reduced the driving ability of NiTi SMA. By preparing the 2A12 aluminum alloy/NiTi SMA laminated structure, a new design basis and relevant technical reserve were provided for the application of intelligent stiffness control technology in a hypersonic environment.