第三章单元测试
- Which is not the characteristic of real fatigue Limit （ ）
- The characteristics of General S-N behavior are as follows （ ）
- The correct conclusions are as follows （ ）
- This cyclic creep decreases the detrimental effects of tensile mean stress on fatigue life. （ ）
- Fatigue limit has ranged from 1to 70 percent of ultimate tensile strength. （ ）
A:Standard, highly polished, unnotched specimen B:Group method C:Fully reversed uniaxial fatigue test D:Testing frequency is larger than 100 Hz
答案:Testing frequency is larger than 100 Hz
A:A discontinuity or “knee” B:Elastic behavior C:S-N curves are usually drawn through median life D:Less scatter in shorter life region
A:The tension mean stress is beneficial B:The compressive mean stress is detrimental C:The tension mean stress is detrimental D:The compressive mean stress is beneficial
A:对 B:错
A:错 B:对
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