Evaluation of crack propagation characteristics in consideration of the mechanical environment and the crystal structure of the fatigue crack tip

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This research has examined the evaluation method that considered the influence of the crystalline structures to the fatigue crack propagation evaluated only in mechanical environment. A purpose of the studies is to get the basics that a highly precise estimate method of fatigue life of the steel structures and the steel which the fatigue crack propagation improved develops.The obtained results are clarification of the deformation at the fatigue crack tip using a high speed and large magnification video during the fatigue crack propagation test by the PIV method, calculation of the re-compressive plastic zone at the fatigue crack tip using the obtained deformation of the crack tip, and elucidation of the three-dimensional relation of the crystalline structures and the fatigue crack route.