SEDL / STP / STP969-EB / STP33070S

Three-Dimensional Effects Affecting the Precision of Lifetime Predictions

Kordisch, H
Head, Numerical Stress Analysis, and director, Fraunhofer-Institut für Werkstoffmechanik, Freiburg,

Sommer, E
Head, Numerical Stress Analysis, and director, Fraunhofer-Institut für Werkstoffmechanik, Freiburg,

Pages: 15    Published: Jan 1988

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Abstract

A series of laboratory experiments on smooth and side-grooved compact specimens, as well as plates under tension with surface flaws, has been reevaluated by means of three-dimensional elastic-plastic finite-element analyses. Particular emphasis is laid on the calculation of the local crack-tip loading parameter, J, and of the local constraint factor, q. These parameters are correlated with experimental findings concerning initiation and stable crack propagation. A first-guess correlation between q and the slope of J(Δa) curves is established.