8 – Fatigue assessment methods for variable amplitude loading of welded structures

: Fatigue loading of most engineering structures involves variable amplitude stress cycles. This chapter starts by introducing alternate types of variable amplitude loading and methods for describing and simplifying load–time histories. Fatigue assessment methods for variable amplitude loading of welded structures based on S–N or crack propagation analysis are explained including the important features of load sequence effects and the influence of variable amplitude loading on small crack growth. Important issues to consider when planning, executing and reporting variable amplitude fatigue test results as well as hints on future trends and additional reading are also given.

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