Engineering Materials - 中国大学mooc
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 < KⅠC, crack began to expand, brittle fracture.
B、when KⅠ > KⅠC, crack extension occurs brittle fracture of instability.
C、when KⅠ = KⅠC, extension began to occur.
D、when KⅠ = 1/2KⅠC, crack extension.
5、Improving lubrication conditions and enhancing the stability of the oxide film are targeted at that type of wear ( ).
A、abrasive wear
B、contact fatigue wear
C、adhesive wear
D、corrosion and wear
2 Microstructure of Engineering Materials
Microstructure of Engineering Materials
1、The number of atoms contained in a dense cubic cell is ( ).
A、2
B、3
C、6
D、8
2、In the crystals of the following substances, the substance with ionic bonds is ( ).
A、SO2
B、SiO2
C、NaCl
D、H2O
3、( ) are the most basic and independent components in the alloy.
A、component
B、alloy
C、phase
D、solid solution
4、Among the following defects, ( ) belongs to the point defect.
A、positive edge dislocation
B、Frenkel defect
C、negative edge dislocation
D、screw dislocation
5、In the following objects, ( ) belongs to crystal.
A、ice
B、glass
C、rosin
D、asphalt
3 Solidification and Crystallization of Engineering Materials
Solidification and Crystallization of Engineering Materials
1、For a given alloy at a certain temperature, the composition of the two equilibrium phases only needs to be a parallel line of the abscissa of the composition at that ( ). The intersection of the parallel line and the curves in the phase diagram corresponds to the composition of the two equilibrium phases.
A、Temperature
B、Quality
C、Quality score
D、Molar mass
2、Generally, when the solid solution is crystallized in equilibrium, the composition of the liquid phase changes along the ( ) line and the composition of the solid phase changes along the solidus line, and finally a solid solution with uniform composition is obtained.
A、Solid phase
B、Liquidus
C、Solid-liquid interface
D、Above the liquid surface
3、Taking the binary phase diagram of Pb-Sn alloy as an example, there are ( ) single phase regions.
A、Two
B、Three
C、Four
D、Five
4、Peritectic phase diagram: two groups of elements can ( ) in liquid state , but in the solid state, it can only be dissolved in a limited amount and has a phase diagram of peritectic transition.
A、Infinite dissolution
B、Limited dissolution
C、Dissolve with each other
D、Dissolve half
5、The alloy phase diagram is an important diagram reflecting the equilibrium crystallization characteristics of the alloy, as well as the relationship between the alloy composition and the balance structure, and the performance of the alloy mainly depends on the composition and structure of the alloy, so the performance of the alloy can be qualitatively judged according to the ( ).
A、Composition of alloy
B、Structure of alloy
C、Phase diagrams
D、Composition and structure of alloy
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 < KⅠC, crack began to expand, brittle fracture.
B、when KⅠ > KⅠC, crack extension occurs brittle fracture of instability.
C、when KⅠ = KⅠC, extension began to occur.
D、when KⅠ = 1/2KⅠC, crack extension.
5、Improving lubrication conditions and enhancing the stability of the oxide film are targeted at that type of wear ( ).
A、abrasive wear
B、contact fatigue wear
C、adhesive wear
D、corrosion and wear
2 Microstructure of Engineering Materials
Microstructure of Engineering Materials
1、The number of atoms contained in a dense cubic cell is ( ).
A、2
B、3
C、6
D、8
2、In the crystals of the following substances, the substance with ionic bonds is ( ).
A、SO2
B、SiO2
C、NaCl
D、H2O
3、( ) are the most basic and independent components in the alloy.
A、component
B、alloy
C、phase
D、solid solution
4、Among the following defects, ( ) belongs to the point defect.
A、positive edge dislocation
B、Frenkel defect
C、negative edge dislocation
D、screw dislocation
5、In the following objects, ( ) belongs to crystal.
A、ice
B、glass
C、rosin
D、asphalt
3 Solidification and Crystallization of Engineering Materials
Solidification and Crystallization of Engineering Materials
1、For a given alloy at a certain temperature, the composition of the two equilibrium phases only needs to be a parallel line of the abscissa of the composition at that ( ). The intersection of the parallel line and the curves in the phase diagram corresponds to the composition of the two equilibrium phases.
A、Temperature
B、Quality
C、Quality score
D、Molar mass
2、Generally, when the solid solution is crystallized in equilibrium, the composition of the liquid phase changes along the ( ) line and the composition of the solid phase changes along the solidus line, and finally a solid solution with uniform composition is obtained.
A、Solid phase
B、Liquidus
C、Solid-liquid interface
D、Above the liquid surface
3、Taking the binary phase diagram of Pb-Sn alloy as an example, there are ( ) single phase regions.
A、Two
B、Three
C、Four
D、Five
4、Peritectic phase diagram: two groups of elements can ( ) in liquid state , but in the solid state, it can only be dissolved in a limited amount and has a phase diagram of peritectic transition.
A、Infinite dissolution
B、Limited dissolution
C、Dissolve with each other
D、Dissolve half
5、The alloy phase diagram is an important diagram reflecting the equilibrium crystallization characteristics of the alloy, as well as the relationship between the alloy composition and the balance structure, and the performance of the alloy mainly depends on the composition and structure of the alloy, so the performance of the alloy can be qualitatively judged according to the ( ).
A、Composition of alloy
B、Structure of alloy
C、Phase diagrams
D、Composition and structure of alloy