第五章单元测试
- Which is not the characteristic of typical loading mode or crack mode（ ）
- Two stress condition contain （ ）
- The limiting conditions for LEFM are as follows （ ）
- The increasing R ratio has a tendency to increase the crack growth rates. （ ）
- The crack can be closed during unloading while the specimen is still under a positive tensile stress. （ ）
A:Sliding mode B:Tearing mode C:Fatigue fracture D:Opening mode
答案:Fatigue fracture
A:Axial loading B:Plane strain C:Plane stress D:Rotating bending
A:The plastic zone size at the crack tip must be smaller relative to the geometrical dimensions of specimen or part B:Should be under cyclic loading C:The net nominal stress in the crack plane must be less than the yield strength D:The plastic zone size at the crack tip must be smaller relative to the crack length
A:对 B:错
A:错 B:对
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