✦ LIBER ✦

The effect of periodic-random loading on fatigue crack growth

✍ Scribed by L. N. McCartney

Publisher: Springer Netherlands
Year: 1976
Tongue: English
Weight: 719 KB
Volume: 12
Category: Article
ISSN: 1573-2673
DOI: 10.1007/bf00036985

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✦ Synopsis

A theory of fatigue crack growth based on the concept of damage accumulation is presented which takes some account of the effect of periodic-random loading. The Dugdale model of plasticity is used to calculate the distribution of the energy dissipated during stress cycling in the plastic zones of a crack embedded in a material sample of infinite extent. It is shown how to calculate the damage accumulated by decomposing the random group of stress levels into significant complete stress cycles of various amplitudes. A simple short numerical algorithm is presented which performs this decomposition. A crack growth law is derived having a very simple form which automatically incorporates the condition for catastrophic failure.

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