直流竜気ポテンシャル法によるCT試験片の高温き裂長さ計測

概要

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D. C. electrical potential technlque bas been successfully used to monitor crack extensnoain CT specimens atelevated temperatures. Anelectrical potential measure I ent System With various features was constructed. A simple graphite paper method was used to obtain the calibration curve for crack length ratio (a/W) vs. normalized electrical potential (V_a/V_<a0>). Polynomial equations (1) (2) were proposed for electrical potential calibration of CT specimens. These equations agreed well with elastic fatigue crack growth, elastic-plastic fatigue crack growth as well as creep crack growth test results for carbon steel, low alloy steel and austenitic stainless steel in the range of RT to 650℃. A convenient procedure to convert electrical potential into crack length was also proposed as shown in Fig. 6. These proposed calibration curve and conversion procedure are useful for standardization of electrical potential technique in future.
社団法人日本材料学会の論文
1986-03-15