静および衝撃圧縮による炭素鋼の挙動に関するX線的研究

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In this experiment, residual stresses and half-value breadths were measured by the X-ray method, on the specimens of carbon steels with circular notches, by application of static or impact loads, followed by application of combined static-impact loads. For impact loading a simple apparatus of drop hammer type was used, and the applied compressive strains at the notch root (0.2 to 0.9%) were measured with a synchroscope. The X-ray measurements were carried out by the film method using CrKα radiations at the notch root, and on the Luders band at three locations. The experimental results obtained are summarized as follows. In the case of separate loading, both residual tensile stresses and half-value b readths increased with the applied strains, and the increase in the latter was remarkably larger in the case of impact load. In the case of combined loading of the same kind, the increases in half-value breadth were smaller and, on the contrary, the residual lattice strains were larger as compared with the case of individual loading. On the other hand, in the case of combined loading of different kind, the change in the sequence of loading gave the inverse tendency. On the Luders band, the residual compressive stresses as well as the increases in half-value breadth showed larger values at points located within the utmost thin layers from the surface, and that the region of lattice distortions is assumed to penetrate the deeper layers under impact load.
社団法人日本材料学会の論文
1968-12-15

静および衝撃圧縮による炭素鋼の挙動に関するX線的研究

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