733 微小欠陥を有する Ti-6Al-4V 合金の高真空環境下における軸荷重疲労特性

概要

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In order to clarify properties of the surface-originating fracture in high vacuum environments, uniaxial tension fatigue tests were carried out in air and high vacuum using pieces made of Ti-6Al-4V alloy with micro-defects by drilling. As a result, the following were obtained : (1) Compared with in air, fatigue lives in high vacuum strongly depended on stress. (2) Interior-originating fractures in high vacuum occurred from higher stress level than those in air. Therefore, we must pay attention to the effect of the interior-originating fracture in case of using this material in vacuum environment like space. (3) There was the possibility that the effect of the dependence of the &K_<th> on crack size in high vacuum is stronger than that in air.
社団法人日本機械学会の論文
2002-09-20