ポリアセタールの白化現象と破壊 : 第3報,負荷条件の影響

概要

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The whitening behavior of injection-molded POM of two kind of molecular weight was investigated by the measurement of trasmitted light intensity variations under constant crosshead speed condition, constant load condition, and cyclic strain condition. Under constant crosshead speed condition, despite the dependence of stress-strain relation on the crosshead speed and molecular weight, whitening-strain relation showed little diference. Under constant load condition, although whitening-time relation and strain-time relation were dependent on molecular weight, the whitening-strain relation showed little diference. Above results indicate that strain would be the main factor of whitening. Under cyclic strain conditions, the degree of whitening decreased with the reduction of the strain. Higher molecular weight specimens had a higher recovery ratio of whitening, but they showed the reduction of elongation capacity by the cyclic strain, compared with lower molecular weight specimens, which had higher crystallinity.
一般社団法人日本機械学会の論文
1986-05-25