Modeling Errors in Fatigue Crack Growth Laws

by Keith Ortiz, Univ of Arizona, Tucson, AZ, USA,
Chieh Julius Kung, Univ of Arizona, Tucson, AZ, USA,



Document Type: Proceeding Paper

Part of: Materials and Member Behavior

Abstract:

Using the fracture mechanics approach to fatigue it is possible to update estimates of a structure's reliability against fatigue failure given new information on the state of cracking, e. g. , an inspectio finding. Essential to this approach is the estimation of the fatigue crack growth rate through the fatigue crack growth law, da/dN equals f ( DELTA K). Most probabilistic analyses model da/dN with analytic functions, which may systematically overestimate or underestimate the true growth rate. This paper examines the source of these systematic modeling errors, the impact on fatigue reliability, and some possible solutions to the problem.

Subject Headings: Fatigue (material) | Structural reliability | Errors (statistics) | Structural analysis | Cracking | System reliability | Structural models

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