中央き裂板のクリープ疲労き裂進展におけるき裂の加速・遅延現象とクリープの影響の検討

概要

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A computational analysis addressing to the creep crack propagation problems is conducted. An incremental finite element procedure is developed and applied for investigating the creep effect on a fatigue crack propagation of a center cracked plate. The near crack parameter T, for which the preliminary study showed the validity of its use in the elastoplastic creep regime, is used in the prosent fatigue crack study. The phenomena of crack acceleration and retardation due to loading spectra are discussed in terms of T and the crack opening/closure load level. T as well as crack opening levels indicates the acceleration and retardation. The creep crack propagates faster than that under the non-creep cracks. The creep strain seems to play the role of suppressing acccleration and retardation effects in low to high, high to low and single overload cases.
一般社団法人日本機械学会の論文
1997-02-25