変動荷重下でのガラス繊維強化複合材料の累積疲労損傷に関する信頼性工学的研究

概要

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The statisitical nature of the cumulative cycle ratio, D=Σn_i/N^^〜_i,of a chopped-strand-mat glass fiber reinforced plastic under random and program loading has been studied experimentally, where N^^〜_i was the median life at the stress amplitudeσ_i as obtained from the S-N curve. In similar to the fatigue life N in constant amplitude tests, D followed a log-normal distribution approximately. The variance of log D in the random and the program load tests was approximately the same as that of log N/N^^〜_i in the constant amplitude tests. This implies that the coefficient of variation of D is approximately equal to that of N. The mean of log D was not equal to zero, hence Miner's rule did not hold statistically. A phenomenological explanation of the tests results was attempted.
一般社団法人日本機械学会の論文
1985-07-25