熱処理鋼の疲労破面の残留応力 (<小特集>X線材料強度小特集)

概要

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The residual stress measurements by X-ray technique were performed on the fatigue fracture surfaces of heat treated high strength steels. It is known that a plastic deformation area is formed at the tip of fatigue crack. The residual stress at the fatigue fracture surface is due to plastic deformation accompanying with crack propagation. Therefore, it is expected that the residual stress at the fracture surface is associated with the mechanical properties of a material and the applied stress condition. The following results were obtained. (1) It is possible to measure the residual stress at the fracture surface with surface roughness under 20 μm. (2) The residual stress at the fatigue fracture surface is related to K-value, but in the final fracture or static fracture surface the residual stress is nearly constant independently on K-value. (3) The residual stress can be expressed as a function of the maximum elastic stress intensity factor K_<max>.(4) In the fracture analysis, the residual stress measurement is an effective method to know the fracture mode and the applied stress condition especially for high strength steels.
社団法人日本材料学会の論文
1978-03-15