Abstract:Shape memory alloys have been applied to improve the reliability and maintainability of piping systems in various aircraft models, including most of the U.S. military aircraft and a variety of civil models of Airbus and Boeing. Recently, they were applied for the first time to the Yun12F aircraft and successfully passed the airworthiness examination. To promote the development of domestic shape memory alloys in the aircraft industry, this study examined the types, characteristics, and applications of memory alloy joints. The study incorporated airworthiness verification experience from imported shape memory alloy joints and conducted fireproof, bursting pressure resistance, and repetitive assembly tests on domestic shape memory alloy joints for the first time. It met the requirements for a 5-minute flame action time, 35MPa pressure bursting, 21MPa pressure resistance, and 8 times repeated assembly. This indicates that the performance of domestic memory alloy pipe joints is comparable to that of imported pipe joints and conforms to existing foreign validation standards. The study identifies the primary failure modes of domestic memory alloy pipe joints and proposes corresponding conformity methods. Additionally, it establishes a preliminary airworthiness validation method based on these conformity methods. This lays the foundation for the development of airworthiness validation methods and standards for domestic memory alloy pipe joints.