LI Yuanjie,LIU Jun,JIN Haibo, et al. FKM-based fatigue assessment of additively manufactured multi-bolt joints: numerical analysis and experimental verification[J]. Advances in Aeronautical Science and Engineering.(in Chinese)
LI Yuanjie,LIU Jun,JIN Haibo, et al. FKM-based fatigue assessment of additively manufactured multi-bolt joints: numerical analysis and experimental verification[J]. Advances in Aeronautical Science and Engineering.(in Chinese)DOI:
FKM-based fatigue assessment of additively manufactured multi-bolt joints: numerical analysis and experimental verification
Additive manufacturing is increasingly used in aerospace load-bearing structures. The FKM guideline, addressing stress concentration, surface condition, and mean stress, is experimentally validated for an additively manufactured multi bolt joint composed of a TA15 titanium central plate and 7B04 aluminum side plates. A finite element model, verified by static tensile tests and strain measurements, is employed to predict critical hole fatigue life and strength utilization at each hole per the FKM procedure. Constant amplitude fatigue tests provide crack initiation lives and sites. Predictions agree with experiments: lives are within the same order of magnitude, and high utilization holes match the observed crack locations. The FKM guideline thus effectively characterizes fatigue performance and critical zones, offering a basis for life estimation, critical hole identification, and fatigue resistant design of additively manufactured multi bolt joints.
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