Energy absorption and shape recovery of NiTi shape memory alloy negative stiffness structure fabricated by selective laser melting
XIANG Zheng1, SHEN Xianfeng1, YANG Qin1, CHEN Jie1, HUO Mingzheng1, DAI Donghua2, YUAN Shangqin3, HUANG Shuke1
1.Institute of Machinery Manufacturing Technology， CAEP， Mianyang 621000, China；
2.College of Materials Science and Technology， Nanjing University of Aeronautics And Astronautics， Nanjing 210000, China；
3.Unmanned System Research Institute， Northwestern Polytechnical University， Xi’an 710000, China
Abstract：The Ni50.4Ti49.6 negative stiffness structure with different geometric parameters was prepared by selective laser melting. The forming quality and transformation behaviors were analyzed, and the effects of geometric parameters and cycles on the quasi-static compression deformation mode, specific energy absorption and shape recovery rate were studied. The results show that the geometric parameters of the buckling surface have an important influence on the deformation mode, specific energy absorption and shape recovery rate of the negative stiffness structure. Asymmetric buckling deteriorates the specific energy absorption and shape recovery of negative stiffness structure. The deterioration can be limited by utilizing reasonable geometric parameters. The NiTi uniform negative stiffness structure (pre-strain of 50%) prepared by selective laser melting can recover to more than 95% of the initial height by heating, and the specific energy absorption can reach 328.3 J/Kg in the first compression process. The bearing capacity and energy absorption of the whole structure can be programmed by combining the negative stiffness elements with different geometric parameters to realize gradient deformation and energy absorption. Though cycling reduces the bearing capacity and energy absorption of NiTi negative stiffness structure, it has no effect on the shape recovery rate.
Key words: NiTi shape memory alloy; Negative stiffness structure; Selective laser melting; Specific energy absorption ; Shape memory effect
向政1，沈显峰1，杨琴1，陈捷1，霍明政1，戴冬华2，袁上钦3，黄姝珂1. SLM NiTi记忆合金负刚度结构的能量吸收与形状恢复[J]. 振动与冲击, 2022, 41(21): 316-324.
XIANG Zheng1, SHEN Xianfeng1, YANG Qin1, CHEN Jie1, HUO Mingzheng1, DAI Donghua2, YUAN Shangqin3, HUANG Shuke1. Energy absorption and shape recovery of NiTi shape memory alloy negative stiffness structure fabricated by selective laser melting. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(21): 316-324.
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