モンテカルロ・シミュレーションを用いた一方向 FRMの引張強度の評価(<小特集>信頼性工学)

概要

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A Monte-Caro Simulation technique, using ashear-1agmodel, is proposed to elucidate the stensile fracture process and the tensile strength of unidirection alber reinforced metal matrix composite materials, On the condition that the fiber behavese lastically and the matrix metal is approximated as an elastic linear hardening plastic material in accordance with the kinematic hardening model. In the simulation procedure, a Conventional tecbnique is modified by γ_<min> method based on the minimum Value of the incremental ratios which can be calculated from the element strengths and the stresses Working on each fiber element and each matrix element. The simulated results show that the average Valueand the coeficient of variation of tensile strength are improved by an increase in the Weibull's Shape parameter of the fiber, although the average value doesfi treach the value estimated from a rule of mixture. Then, in order toinvestigate the validity of the present technique, the simulated Strength data are compared with the the oretical cumulative distribution Curnvegivel by a recursion analysis technique. Additionally, it is shown that the structural uncertainty, e.g. random fiber spacing, lowers the composite average strength and increases its scatter.
社団法人日本材料学会の論文
1991-03-15