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Microplastic Strain Hysteresis Energy as a Criterion for Fatigue Fracture
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This materials science paper proposes an energy-based fatigue failure criterion using microplastic strain hysteresis energy, developing a relation between stress amplitude and cycles to failure. 'Microplastic strain' refers to small-scale plastic deformation in metals during cyclic loading and has no connection to environmental plastic pollution.
In this paper an energy criterion for fatigue failure is postulated. Microplastic strain hysteresis energy is considered to be an index for fatigue damage. On this basis, a relation is developed between stress amplitude and the number of cycles to failure which utilizes only material properties obtained from the static true stress-strain tension test. The analysis is found to compare well with an experimentally determined S-N curve for SAE 4340 steel.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.