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It is well known that a bolt is apt to loosen by slipping between the contact surfaces of joined parts. A loosening test using real parts involves precisely expressed real phenomena which are under the influence of multiple factors such as slip distance, surface roughness/waviness, and coefficient of friction, etc. However, estimating the influence of individual factors is very difficult because the behavior of real contact surfaces correlates to the variation of friction coefficient. Therefore, it is required to apply simulations to control the coefficient of friction. In this study, FE analyses were carried out with various levels of certain factors, and the self-loosening of a bolt was investigated. As a result, the calculations revealed that slip distances and coefficients of friction strongly influence the self-loosening of a bolt, but roughness/waviness of the pressure flank of threads had hardly effect. These tendencies coincide with the real nut's phenomena that adhesive is effective, and roughness/waviness on the surface is not active for prevention of loosening.

nihon kikai gakkai ronbunshū. c

Verification of Self-Loosening Mechanisms for Threaded Fastener (1st Report, Behaviour and Effective Factors for Bolt Loosening under Transverse Cyclic Load Generated by Linearly Vibrating Washer)