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To assemble tubular structures such as pipelines, risers, …, threaded couplings can be used. In service these couplings are often subjected to dynamic loads, and to maintain a secure connection, they are generally preloaded. The combination of preload and external dynamic loads results in a multiaxial stress distribution over the connection, where the coupling’s threads act as stress raisers, initiating...
In an attempt to understand the effect of mode-mixity on the growth of a nominal defect under repetitive sub-critical loads, fatigue experiments are conducted on an Aluminium alloy at different mode-mixities. Three-dimensional finite element simulations akin to experiments are performed at different crack lengths and mode-mixities to study their effect on the opening stress, stress-state characterised...
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