高硬度材料の疲労破面残留応力モデルの検討

概要

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To investigate the opening and closing behaviors of fatigue cracks on the surface of 1/2CT specimen of high-speed tool steel SKH51, the contact stress σ_<c1> between the two opponent fracture surfaces was determined by X-ray stress measurements in the vicinity of fatigue crack tip at K_<max>=8.9 MPam^<1/2> and K_<max>=15.4 MPam^<1/2> during the loading process. The results obtained are summarized as follows. The residual stress on the fatigue fracture surface was found to be given as the sum of three components;the tensile stress component σ_<r1>, resulting from the monotonic plastic zone dimension, the compression stress component-σ_<r2>, resulting from the cyclic plastic zone dimension, and the compression component-σ_<r3>, resulting from the contact compression zone dimension under the fracture surface. The effect of-σ_<r3> was especially large in the low stress intensity factor range, and consequently the residual stress on the fracture surface became compressive.
社団法人日本材料学会の論文
1991-01-15