Fatigue Life Analysis of Particle Dispersed Composite Materials by Reliability Concept

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  • 粒子分散型複合材料の信頼性工学の手法による疲労寿命の解析
  • リュウシ ブンサンガタ フクゴウ ザイリョウ ノ シンライセイ コウガク ノ

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In recent years, particle dispersed composite materials are widely used as structural materials like fiber reinforced composites. These materials with brittle fracture behavior are generally characterized by a large amount of scatter in the results of fatigue life tests, so that the reliability concept is required for prediction of their fatigue lives. The main results obtained in this work are summarized as follows;<br>(1) The fatigue life distribution of particulate composites consisting of matrix and n kinds of particles and voids can be obtained with the assumptions that the weakest link theory can be applied to the specimen composed of an aggregate of cross sectional elements in series, and that the Weibull distribution is adoptable for the distribution of fatigue life of the element in composite materials.<br>(2) The roles of each element played in the fatigue life of particulate composites were well-defined. This study also clarified all of the S-N curves for matrix and each of the particles as well as the shape parameters of each element in Weibull distribution which determines the amount of scatter.

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