衝撃繰り返しによる残留応力の変化のX線による研究

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The measurement of residual stress by X-rays is utilized nowadays in many laboratories in consequence of the considerable improvement made in the accuracy of measurement brought about recently by the remarkable development of the X-ray diffraction apparatus and the accessory measuring devices. It is becoming one of the powerful methods of residual stress measurement. One of the authors has investigated the change in residual stress due to fatigue stressing, and found that a linear law of fading of residual stress holds in the range except in the early stage of repeated stressing. In this paper, the change in residual stress due to repeated impact is reported, and the application of the linear law of residual stress fading to the present case is examined. Two sorts of plate specimens were used, the one was of notched type using a low carbon steel (0.08%C), and the other was of unnotched type employing a high carbon steel (0.55%C). With the former, residual stress was introduced by plastic stretching, and with the latter by low temperature quenching. The specimens were put into a groove cut on the surface of a hard wood so as to be supported at both ends. Impact loading was given to the central parts of the specimens by a simple device of dropping a weight. The speed of cyclic impact was made to be 22 blows per minute by using a disc attached with a claw, which was rotated at 22 rpm by the motor through reduction gears.
社団法人日本材料学会の論文
1963-12-15

衝撃繰り返しによる残留応力の変化のX線による研究

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