第七章单元测试
The High-temperature fatigue is （ ）
- Temperature influence on fatigue strengths （ ）
- The description of Neuber’s rule is as follows （ ）
- As the hold time increased, the life decreased drastically at both test strain ranges. （ ）
- Both frequency and temperature will affect the fatigue resistance of materials. （ ）
A:Below 60 percent of the absolute melting temperature B:Below 50 percent of the absolute melting temperature C:More than 40 percent of the absolute melting temperature D:More than 20 percent of the absolute melting temperature
答案:More than 40 percent of the absolute melting temperature
A:The fatigue strength continuously decreases with cycles to failure B:Temperature influence is small C:Metals at high temperatures do not usually show a fatigue limit D:108 cycles may be a reasonable value for obtaining a long-life fatigue strength
A:Fine-grain materials tend to give higher fatigue resistance B:Fine-grain materials tend to give higher fatigue resistance C:Coarse-grain materials give higher creep resistance D:Coarse-grain materials give higher creep resistance
A:对 B:错
A:对 B:错
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