高強度鋼および軟鋼の疲労破面近傍の残留応力(<小特集>X線材料強度小特集)

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The residual stress left on fracture surface is a useful information to analyse local plastic deformation near the crack tip. In the present study, X-ray residual stress measurements were conducted on the fatigue fracture surface of a low-alloy high strength steel (JIS SNCM 8) and a structural low-carbon steel (JIS SM 41 B), and the results were analysed based on fracture mechanics. The followings are the main results obtained. (1) The residual stress on the fatigue fracture surface was tension. The residual tensile stress increased with the maximum stress intensity factor K_<max> in the case of the material tempered at 200℃, While it has a maximum value at about K_<max>=30 MPa√<m> in the case of the material tempered at 600℃. On the fracture surface of mild steel, the residual stress tended to decrease with increasing K_<max>. (2) The distribution of the residual stress beneath the fatigue fracture surface of the high strength steel was able to be decomposed into three parts : the distribution caused by monotonic plastic deformation near the crack tip, that relieved by surface roughness, and that resulting from the compressive deformation due to crack closure. (3) The maximum depth of the plastic zone ω determined from the residual stress distribution was correlated to K_<max> and the yield stress σ_Y as follows. ω= 0.21(K_<max>/σ_Y)^2 This equation holded for the cases of high strength steels tempered at 200 and 600℃. On the other hand, in the mild steel, the width of X-ray diffraction profiles was suggested to be a more appropriate parameter for plastic zone determination than the residual stress.
社団法人日本材料学会の論文
1982-03-15

高強度鋼および軟鋼の疲労破面近傍の残留応力(<小特集>X線材料強度小特集)

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