Calculation Model of Mechanical and Sealing Properties of NiTi Alloy Corrugated Gaskets under Shape Memory Effect and Hyperelastic Coupling: I Mechanical Properties

• Published in: Materials Vol. 15; no. 14; p. 4836
• Main Authors: Zhu, Lingxue, Liu, Yang, Li, Mingxuan, Lu, Xiaofeng, Zhu, Xiaolei
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 12.07.2022; MDPI
• Subjects: Alloys; Chemical industry; contact stress prediction; Contact stresses; Corrugated plates; Corrugation; Deformation; Finite element method; Gaskets; Graphite; Intermetallic compounds; Mechanical properties; mechanical property; Nickel base alloys; Nickel titanides; NiTi alloy corrugated gasket; Nuclear energy; Phase transitions; Prediction models; Shape effects; Shape memory alloys; shape memory effect; Temperature effects; Yield stress
• ISSN: 1996-1944; 1996-1944
• 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.