engleski

Crack Initiation Limits Prediction at Combined HCF/LCF Loading

Explicit expression is derived for components subjected to HCF loading, enabling initiation life assessment on the basis of the designed crack initiation curve and the Goodman plot in the Smith diagram. For components under combined HCF/LCF loading, the closed form expression for determining the crack propagation threshold and estimating the crack initiation life is obtained. As an example of the use, Smith and Haigh diagrams are obtained for the components made of titanium alloy Ti-6Al-4V, which limits the permissible area of applied stressess.

crack initiation life; CI curve; Smith diagram; boundary stress curve

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