第二章单元测试
- Which is not the characteristic of slip （ ）
- The characteristics of beach mark are as follows （ ）
- Modes of fatigue crack growth with fracture are as follows （ ）
- Crack nucleate at surface and grow across several grains (stage I, microcrack), and then to grow in a zigzag manner (stage II, macrocrack). （ ）
- The mechanical property of each grain is the same. （ ）
A:The relationship between dislocations and plastic deformation B:Occurring within individual grains by dislocation movement C:A shear deformation of the metal D:The same characteristics under monotonic loading and cyclic loading
答案:The same characteristics under monotonic loading and cyclic loading
A:Two adjacent crack surfaces with open, close, and rub B:Wavy bands C:Pattern of crack growth D:Crack’s starting, stopping and growing at different rates
A:Slip deformation B:Inter-crystalline fracture C:Trans-crystalline fracture D:Dislocation movement
A:对 B:错
A:错 B:对
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