| Citation: | ZHAO Guang, ZHANG Zexin, YUAN Yunbo, et al. Contact stiffness identification of tenon joint structures and verification[J]. Journal of Aerospace Power, 2025, 40（5）：20230059 doi: 10.13224/j.cnki.jasp.20230059
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Contact stiffness of tenon joint structures is a crucial parameter that affects the natural vibration characteristics of the blade-disk assembly structure and a prerequisite for accurate dynamic analysis of the blade-disk coupled system. Contact positions of the tenon joint structure were treated as thin layer elements, the mapping relationship was derived between the normal, tangential contact stiffness and the thin layer element property. An experimental setup for the natural vibration characteristics of the tenon joint structure was designed and constructed. Combining experiments on natural vibration characteristics under various compression forces with thin layer element simulations, the normal and tangential contact stiffness of the tenon joint structure was simultaneously identified. An equivalent tenon joint surface-to-surface fretting friction experiment was designed to measure the tangential contact stiffness, verifying the accuracy of the proposed identification method. The identification results showed that the contact stiffness increased slowly at first and then rapidly with the increase of the compression force. When the mean contact stress reached 200 MPa, the contact stiffness almost remained unchanged. The average relative error between identified contact stiffness and the fretting friction experiment results was only −4.73%. The proposed contact stiffness identification method of tenon joint structures was highly accurate and the identification process was straightforward.
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