Zhu Lingxue, Liu Yang, Li Mingxuan, Lu Xiaofeng, Zhu Xiaolei
Department of Mathematics, Jinling Institute of Technology, Nanjing 211169, China.
School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing 211816, China.
Materials (Basel). 2022 Jul 12;15(14):4836. doi: 10.3390/ma15144836.
NiTi alloy's shape memory effect provides additional restoring force under temperature loads, making it an ideal material for gaskets. However, its yield stress is too large to form the initial seal. In this paper, by combining the advantages of corrugated structure and NiTi alloy's shape memory effect, a NiTi alloy corrugated gasket is proposed. Its mechanical properties were studied using experiments and the finite element method. The influences of geometric parameters on gasket performance were discussed. The results show that the shape memory effect can greatly improve the contact stress of gaskets. The corrugation can effectively reduce the pre-tightening force. The contact stress of NiTi alloy corrugated gasket is significantly affected by plate thickness, gasket height, and corrugation pitch and shows a high nonlinear characteristic. The proposed finite element method (FEM) and the gasket contact stress prediction model are accurate and engineering available.
镍钛合金的形状记忆效应在温度载荷下提供额外的恢复力，使其成为制作垫片的理想材料。然而，其屈服应力过大，难以形成初始密封。本文结合波纹结构和镍钛合金形状记忆效应的优点，提出了一种镍钛合金波纹垫片。采用实验和有限元方法对其力学性能进行了研究。讨论了几何参数对垫片性能的影响。结果表明，形状记忆效应可大大提高垫片的接触应力。波纹可有效降低预紧力。镍钛合金波纹垫片的接触应力受板厚、垫片高度和波纹节距的显著影响，并呈现出高度非线性特征。所提出的有限元方法（FEM）和垫片接触应力预测模型准确且具有工程实用性。
