繰返しの高応力下におけるき裂伝ぱ挙動と延性不安定破壊特性 : 第2報, 原子炉圧力容器鋼A508の場合

概要

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The J-R curve, fatigue crack growth rate and aharacteristics of ductile unstable fracture under monotonic and cyclic load were investigated using 1TCT test specimens which were cut out from A508 steel for reactor pressure vessels. All the tests were carried out at 100℃. The main results obtained were as follows. (1) The J-R curve under the cyclic load is not a material constant but is dependent on the test conditions. (2) da/dN from typical fatigue data cannot be extrapolated by ΔJ only if the value of da/dN is above 5×10^<-4> mm/cycles. However, it can be extrapolated by using the following equation in which J_<max> is used: da/dN=C{√<ΔJ>/(B-√J_<max>)}^m. (3) The J values at instability obtained from the ductile unstable fracture test carried out under the cyclic load of stress ratio R=0, 0.1 and -1.0 were compared with those from the monotonically increasing load. These J values at instability were almost the same as that for the monotonically increasing load.
一般社団法人日本機械学会の論文
1990-09-25