Case Studies of Fatigue Crack Growth Using an Improved Micro-Ligament Instability Model.
NAVAL RESEARCH LAB WASHINGTON DC
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The tensile ligament instability model TLIM has been refined and modified. A large set of new data cases is analyzed using the improved algorithm, most of these with high fidelity. In microstructurally varied titanium alloys, the process zone size is associated with the effective grain size in structural and alloy steels it decreases with increasing yield strength, presumably here too related to grain refinement. The other fitting parameters, of environmental surface attack, show an internal consistency among the various specimen materials and environments. The modified model is thought to provide an advantageous means of comparing crack propagation data, and, in selected classes of materials, a suitable basis for predicting fatigue propagation life.
- Properties of Metals and Alloys