実働荷重下の疲労き裂伝播の研究 : (第1報) ランダム荷重とブロック荷重との比較

概要

論文の詳細を見る
Most of actual service loads for real structures are random in general and, moreover, are stationary processes in many cases. It is essential for the structural engineer to be able to estimate fatigue strength of structural members under the effect of such randomness in service loading on the basis of the conventional fatigue test data. Engineers are sometimes confronted with the necessity of prompt relevant action on cracks discovered by inspection in service or in fabrication. A number of investigations on estimating methods for fatigue crack growth under random loading have been carried out, but most of them are based on the assumption that the random loading can appropriately be replaced by so called "block loading". Experimental investigations on the comparison between fatigue behaviors under purely random loading and block loading and/or constant amplitude loading are quite limited. In this paper, the authors have conducted fatigue crack propagation tests using a computer aided testing system, where random process required was g6nerated by micro-computer, as well as block loading and constant amplitude tests. Experimentally obtained features and comparative discussion based on the experimental data are given.
社団法人日本船舶海洋工学会の論文