Fatigue Life Design of Mechanical Structure 知到智慧树答案2024WYC z48606

绪论 单元测试

1、单选题：
Excess deformation is （ ）

A:Stress corrosion cracking
B:High energy absorption
C:Little plasticity
D:The most common failure mode
答案: The most common failure mode

2、多选题：
The correct statement of fatigue includes （ ）

A:Loading, uni/multi-axial loading
B:Repeated loading
C:Crack nucleation/growth
D:Constant or variable amplitude
答案: Loading, uni/multi-axial loading;
Repeated loading;
Crack nucleation/growth;
Constant or variable amplitude

3、多选题：
The contribution of August Wöhler is as follows （ ）

A:Fatigue limit
B:Corrosion fatigue
C:Multiple fatigue
D:S-N Curve
答案: Fatigue limit;
S-N Curve

4、判断题：
Failure due to fatigue, i.e. repeated loading, is the most common cause of mechanical failure. （ ）

A:对
B:错
答案: 对

5、判断题：
Proper fatigue design includes synthesis, analysis and testing. （ ）

A:对
B:错
答案: 对

第一章 单元测试

1、单选题：
The characteristics of fail-safe design is （ ）

A:Expected maximum load or stress occur occasionally
B:If one part fails, the system does not fail
C:The oldest criterion
D:Fracture mechanics analysis and tests
答案: If one part fails, the system does not fail

2、多选题：
Four kinds of possible design situations are as follows （ ）

A:Model design
B:Product design
C:Design to standard
D:Equipment design
答案: Model design;
Product design;
Design to standard;
Equipment design

3、多选题：
The main points of damage tolerance design are as follows （ ）

A:Minimum detectable crack size
B:Slow crack propagation
C:High fracture toughness
D:Anti-crack measures
答案: Minimum detectable crack size;
Slow crack propagation;
High fracture toughness;
Anti-crack measures

4、判断题：
Analysis needs to be confirmed by tests. （ ）

A:错
B:对
答案: 对

5、判断题：
Allowable service life should be less than test or calculated life. （ ）

A:对
B:错
答案: 对

第二章 单元测试

1、单选题：
Which is not the characteristic of slip （ ）

A:The same characteristics under monotonic loading and cyclic loading
B:The relationship between dislocations and plastic deformation
C:A shear deformation of the metal
D:Occurring within individual grains by dislocation movement
答案: The same characteristics under monotonic loading and cyclic loading

2、多选题：
The characteristics of beach mark are as follows （ ）

A:Wavy bands
B:Pattern of crack growth
C:Crack’s starting, stopping and growing at different rates
D:Two adjacent crack surfaces with open, close, and rub
答案: Wavy bands;
Pattern of crack growth;
Crack’s starting, stopping and growing at different rates;
Two adjacent crack surfaces with open, close, and rub

3、多选题：
Modes of fatigue crack growth with fracture are as follows （ ）

A:Trans-crystalline fracture
B:Slip deformation
C:Inter-crystalline fracture
D:Dislocation movement
答案: Trans-crystalline fracture;
Inter-crystalline fracture

4、判断题：
Crack nucleate at surface and grow across several grains (stage I, microcrack), and then to grow in a zigzag manner (stage II, macrocrack). （ ）

A:对
B:错
答案: 对

5、判断题：
The mechanical property of each grain is the same. （ ）

A:错
B:对
答案: 错

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