Abstract
The growth behavior of a naturally initiated corner crack under a uniform residual stress field is investigated in this study. A convenient method is proposed to induce and evaluate the uniform residual stress field for a beam-type specimen. Fatigue tests are conducted with a rotary bending fatigue machine to investigate the growth of the corner crack. For this reason, a cylindrical specimen, which is typically used for rotating bending tests, is modified into a beam specimen. The corner crack growth behavior under residual stress is evaluated based on linear elastic fracture mechanics (LEFM) and compared with long through crack data. The test results verify that the corner crack growth under residual stress can be effectively evaluated by LEFM and estimated using long crack data.
Highlights
Residual stress can be introduced into a structure by various manufacturing processes such as forging, welding, and cold drawing
The corner crack growth behavior under residual stress is evaluated based on linear elastic fracture mechanics (LEFM) and compared with long through crack data
The applied residual stress is evaluated based on the inelastic bending theory
Summary
Residual stress can be introduced into a structure by various manufacturing processes such as forging, welding, and cold drawing. By applying and releasing a tensile overload on a CT specimen, a residual stress field is induced near the crack tip [3,4]. This stress can be calculated when a relevant residual strain distribution is known. Cyclic loads are applied with a rotating bending fatigue test For this test, a cylindrical specimen, which is typically used for the rotating test, is modified into a square-shaped. The growth behavior of the naturally initiated corner crack is evaluated utilized. The growth behavior of the naturally initiated corner crack is evaluated based on LEFM based on LEFM and subsequently compared with long through crack data.
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