Observational analysis shows how specimen thickness affects residual stresses in fatigue cracks, suggesting implications for material durability.
Within the cyclic damage zone ahead of a fatigue crack, residual compressive stresses are generated upon unloading from far-field tensile stress and residual tensile stresses are created upon unloading from far-field compressive stress. These cyclic plastic zones can have a significant affect on the fatigue fracture behavior of the material. If a material is overloaded in tension, residual compressive stresses can result in fatigue crack retardation. Conversely, a component subjected to a compressive overload may exhibit enhanced crack propagation rates due to the residual tensile stresses developed in the near-tip region. The size and magnitude of these residual stresses are directly proportional to the size of the monotonic plastic or damage zone and thus the state of stress ahead of the crack. This study will investigate the role of specimen thickness as a measure of near plane strain conditions versus near plane stress conditions and its affect on the fatigue crack growth behavior in both cyclic compression and tension.
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Rondinone et al. (1995) studied this question.
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