Fatigue failures of bolted joints are of great concern when designing machines and structures. A joint diagram is often used to evaluate the stress amplitude of the target bolt caused by alternating external forces. It has already been pointed out by some researchers and design engineers that the diagram cannot estimate the stress amplitude with sufficient accuracy for practical use. The primary reason is that a conventional joint diagram does not take into account the effect of joint interface separation, which often occurs under high external forces. Also, Load Factor, the ratio of the bolt force increase to the applied external force, shows a non-linear behavior for varying external force, though it is usually assumed to be constant in a conventional joint diagram.
Evaluation of Stress Amplitude of Bolted Joints by FE Analysis and Joint Diagram and a Simple Strategy for its Reduction
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Fukuoka, T, & Taniuchi, H. "Evaluation of Stress Amplitude of Bolted Joints by FE Analysis and Joint Diagram and a Simple Strategy for its Reduction." Proceedings of the ASME 2015 Pressure Vessels and Piping Conference. Volume 2: Computer Technology and Bolted Joints. Boston, Massachusetts, USA. July 19–23, 2015. V002T02A024. ASME. https://doi.org/10.1115/PVP2015-45084
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