荷重および変位制御繰返し変形下におけるき裂先端近傍の局部的ひずみの計測とそれに基づく疲労き裂進展過程の検討

概要

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The localized strain around a crack tip and the crack tip opening displacement were measured under displacement- and load-controlled cyclic loadings with displacement and load ratios of -1.0 which involved single overload and single overdisplacement applications, respectively. Special attention was given to the two behaviors during one cyclic loading. The crack remains open at the compressive tip of a load-displacement hysteresis loop under displacement-controlled loading as well as under load -controlled one. The strain around the crack tip and the crack tip opening displacement largely generated by single overdisplacement application are not fully restored in the following compressive load stroke to their original amounts at the compressive tip of the controlled displacement wave just before the overdisplacement application. A small amount of tensile strain and of the crack opening displacement are retained in the vicinity of the crack tip at the compressive tip of the hysteresis loop immediately after a single overdisplacement application. A single overdisplacement application causes the delay of crack growth due to the two behaviors in the displacement-controlled test, which, however, is quite small compared with that in the load-controlled test involving a single overload.
一般社団法人日本機械学会の論文
1995-08-25