工業用純チタニウムの高温動クリープおよび高温疲労

概要

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Dynamic creep and fatigue tests were carried out for a commercial pure titanium at a temperature of 300℃. Frequency of alternating stress was 1800 cpm. The followings are the facts clarified from the test results under repeated loading. Under the dynamic stress condition as well as under the static stress condition, there exists a critical stress above which the fracture occures in a short time (several minutes) after loading and below which the fracture does not take place. When a stress below the critical stress is applied, the major part of the strain is produced in the course of time as short as the fracture time in the case of applied stress above the critical value. As for the relation between dynamic creep strength and static creep strength, the peak of the critical dynamic stress is equal to the critical static stress, and the same strain is produced under the same maximum stress no matter whether the stress is static or dynamic. This agrees with the conclusion of the analysis made by the present authors based on the mechanical equation of state. Under the reversed stress, the critical is not so clear as is the case under repeated stress. The fatigue limit in this case is appreciablly less than the critical static stress.
社団法人日本材料学会の論文
1960-02-15