Three-dimensional fatigue crack closure behavior of metals
Abstract
This thesis describes the three-dimensional variation in plasticity induced fatigue crack closure behavior of metals. Experimental determination of the plasticity induced fatigue crack closure behavior of 2024-T351 aluminum was made using fatigue striations, strain gages, and displacement gages. A three-dimensional elastic finite element analysis was conducted to calculate the three-dimensional fatigue crack closure behavior. The experimental measurements and the finite element calculations indicate that, for metals, a significant three-dimensional variation in plasticity induced fatigue crack closure behavior exists. Near the surface, where the stress state was plane stress, high crack opening loads were measured and calculated. In the interior, where the stress state was plane strain, lower crack opening loads were measured and calculated.
Degree
Ph.D.
Advisors
Grandt, Purdue University.
Subject Area
Aerospace materials
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