Journal of Lanzhou University of Technology ›› 2020, Vol. 46 ›› Issue (3): 155-159.

• Scientific • Previous Articles     Next Articles

Fatigue life analysis of Ni-Ti shape memory alloy pipe joints under random vibration

LI You-tang, WANG Biao   

  1. College of Mechanical-Electrical Engineering, Lanzhou Univ. of Tech., Lanzhou 730050, China
  • Received:2019-03-29 Online:2020-06-28 Published:2020-08-19

Abstract: Random vibration fatigue life analysis of Ni-Ti alloy pipe joints in pipeline system was carried out. Taking Ni-Ti alloy pipe joints in a typical hydraulic pipeline of an aircraft as a research object, the formula for evaluating overall fatigue damage in the joints is obtained by using the Steinberg method based on Gauss distribution and Mine linear cumulative damage law. Based on the constitutive model describing thehyperelasticity and memory effect of Ni-Ti shape memory alloy,the finite element model of the pipe joint is established and themodal analysis and random vibration response analysis of the system model are then carried out, and the fatigue life of joint structures is predicted by using the fatigue damage formula. Predicted results show that the Ni-Ti shape memory alloy pipe joints are safe and reliable within the flight life of 80 000 h, which may provide a theoretical reference for design and optimization of the pipe joints.

Key words: random vibration, pipe joint, Ni-Ti shape memory alloy, power spectrum, fatigue life analysis

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