X線解析による疲労破面の研究(<小特集>X線材料強度小特集)

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The technique analysing the cause and mechanism of fracture from the information obtained by X-ray irradiation on the fractured surface is called "X-ray fractography". As a basic study of X-ray fractography, the relation between the residual stress on the fatigue fractured surface and some parameters of the fracture mechanics were investigated. The materials used were Ni-Cr-Mo-steel, 0.5%C steel and high strength steel (U.T.S. >588 MPa). The test pieces were CT-specimens with W-51 mm and B-12mm. The fatigue tests were carried out under constant load and constant range of stress intensity factor. On the fatigue fractured surface the residual stress along the crack propagation direction was measured by a parallel beam X-ray stress measurement system, and the half value breadths of the diffraction profile were also measured. The main results obtained were as follows. (1) In the linear crack propagation stage of conventional constant load fatigue tests the residual stress on the fractured surface increased at first, and then decreased with increasing ΔK after about ΔK=30MPa√<m>. (2) For Ni-Cr-Mo-steel and 0.5%C steel, the residual stess could be expressed as a function of ΔK and affected only slightly by stress ratio. (3) For high tensile strength steel, the relation between the residual stress on the fractured surface and ΔK showed a dependence on stress ratio. (4) In constant ΔK fatigue tests of Ni-Cr-Mo-steel, the residual stress on the fractured surface was almost constant and agreed with the value corresponding to the same ΔK by the constant load fatigue test. (5) The half value breadth of the diffraction profile had a good correlation with K_<max> and increased with increasing K_<max> except for the normalized high tensile steel.
社団法人日本材料学会の論文
1983-03-15

X線解析による疲労破面の研究(<小特集>X線材料強度小特集)

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