赤外線計測による応力拡大係数範囲の測定精度改善に関する研究

概要

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Stress intensity factor ranges for CT and CCT specimens evaluated by infrared method in the previous studies were almost lower than analytical values. In addition, the difference between measurement results and numerical values increased in proportion to those values not to concern with the stress ratio. In this study, the effect of heat conduction in a body of CCT specimens under cyclic loading was conducted by a finite differential analysis in order to examine the source of the discrepancy between measurements and numerical values. As a result, the error was caused that locations of crack tips were misread due to heat conduction and plastic deformation near crack tips. Thus the method specifying a crack tip from a measurement result has been developed. The stress intensity factors evaluated by using accurate locations of crack tips coincided with numerical values within 7%.
2005-11-25