膜材の疲労き裂伝ぱ挙動に関する研究 : 疲労試験法と疲労き裂伝ぱ連度の支配要因

概要

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A new fatigue testing method was proposed by which fatigue crack propagation could be caused in a film attached to elliptical and circular holes on a base plate subjected to push-pull cyclic loads. In a Boundary Element Analysis of this method, stress intensity factors were almost constant during the greater part of crack propagation. With the use of commercial-grade iron films of 100-μm thickness, the fatigue crack propagation rate was expressed by a power law of stress intensity factor range under various stress amplitudes with a stress ratio of R=0 for the film attached to the base specimen. However, a considerable residual plastic layer was left in the wake of propagating cracks on the film. Effective stress intensity factor ranges were considered to be a good parameter controlling the fatigue crack growth in both film and bulk specimens.
社団法人日本機械学会の論文
1993-07-25