ポリアセタールの白化現象と破壊 : 第5報,クリープ白化の確率論

概要

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The creep whitening behavior of injection molded POM specimens was investigated. Whitening was attributed to numerous microscopic fractures in the material, taking place in the creep process, and was treated by means of a stochastic theory. It was found that the whitening process obeyed the Weibull distribution function and depended on the stress in a form C・exp(ασ), in agreement with the rate process theory. It was also found that whitening proceeded most rapidly at the strain where the tensile stress was a maximum, under a constant cross head speed condition. At this strain, of about 10%, the spherulites are still not highly deformed. Therefore, the above-mentioned microscopic fractures may be those occurring in the spherulite structure at the spots where the bonding is local, and especially weak.
一般社団法人日本機械学会の論文
1987-06-25