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超星Engineering Materials 期末答案 ( 学习通2023课后作业答案)

学习通答案 2023-07-21 02:47
超星Engineering Materials
期末答案
(
学习通2023课后作业答案) 1 Mechanical Properties of Engineering Materials

Mechanical Properties of Engineering Materials

1、In the following hardness measurement method, the diamond head is used for ( ).
A、HV
B、HRC
C、HB
D、HRA

2、The following statement about fatigue is true ( ).
A、The stress of fatigue is higher than the yield strength of static load.
B、Obvious plastic deformation can be observed at fatigue fracture.
C、Fatigue fracture can be divided into fatigue source, bright area, rough area.
D、The occurrence of fatigue fracture is premonitory and is called brittle fracture.

3、What's true about the fracture is that ( ).
A、Brittle material fracture fibrous.
B、Ductile materials have no obvious plastic deformation before fracture.
C、The fracture of the ductile material is crystalline and shiny.
D、The fracture of brittle materials is crystalline or porcelain.

4、KIC is the index of fracture toughness of type I crack. The following statement is correct ( ).
A、when KⅠ


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