2021 Mechanics of Materials(Central South University) 最新满分章节测试答案

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本课程起止时间为:2021-03-01到2021-07-12
本篇答案更新状态:已完结

1. Introduction Unit Test of Chapter 1

1、 问题:The ability of a member to resist failure under external load is the _ of material.
选项：
A: Strength
B: Stiffness
C:Stability
D: Plastic
答案: 【 Strength】

2、 问题:The capacity of a member to maintain its original equilibrium state under external load is the            .
选项：
A:Stiffness
B:Strength
C:Stability
D:Toughness
答案: 【Stability】

3、 问题:The assumption of deformed solids in material mechanics does not include            .
选项：
A:Continuity hypothesis
B: Uniformity hypothesis
C:Isotropic hypothesis
D: Plane hypothesis
答案: 【 Plane hypothesis】

4、 问题:The stress perpendicular to the section is called           .
选项：
A:Total stress
B:Normal stress
C:  Shear stress
D:Principal stress
答案: 【Normal stress】

5、 问题:What is wrong with the following description of internal forces is               .
选项：
A:An internal force is an additional interaction between parts of an object caused by an external force
B:The internal forces are continuously distributed throughout the cross section
C:The internal force varies with the external force
D:An internal force is an interaction between particles in an object
答案: 【An internal force is an interaction between particles in an object】

6、 问题:When subjected to a pair of forces of equal magnitude, opposite direction, and the line of action coincident with the axis of the member, the deformation of the member is                .
选项：
A:Stretch or compression
B:Shear
C:Bend
D:Torsion
答案: 【Stretch or compression】

7、 问题:Before deformation, the distance between two points A and B on the tensile sample is 100mm. After deformation, the increment of the distance between two points is           mm, so the average linear strain between two points A and B is                .
选项：
A:
B:
C:
D:
答案: 【】

8、 问题:The basic method to study the internal forces of components in material mechanics is             .
选项：
A:Superposition method
B:Method of section
C:Force method
D:Energy method
答案: 【Method of section】

9、 问题:The figure shows that the triangular thin plate is deformed by external forces. The vertical displacement of the corner at angle B is 0.3mm, but AB and BC remain straight. Given that AC=200mm, the average linear strain along the AB side is             mm.
选项：
A:
B:
C:
D:
答案: 【】

10、 问题:On the assumption of uniformity, the              of a component is assumed to be the same everywhere.
选项：
A:Displacement
B:Stress
C: Strain
D: Modulus of elasticity
答案: 【 Modulus of elasticity】

2. Axial tension compression and shear Unit Test of Chapter 2

1、 问题:The application conditions of the normal stress equation  is              .
选项：
A:Materials is in Hooke’s law
B:Load within the elastic range
C:The line of action of the axial force passes through the centroid of the section and is perpendicular to the section
D:All above
答案: 【All above】

2、 问题:In the tensile experiment of low-carbon steel, the stage where the stress remains basically the same while the strain increases significantly is called     .
选项：
A:Elastic region
B:Yielding
C:Strain hardening
D:Necking
答案: 【Yielding】

3、 问题:The maximum shear stress in the rod in tension and compression is 40MPa, then the maximum normal stress in the rod is equal to     .
选项：
A:80MPa
B:40MPa
C:60MPa
D:56.6MPa
答案: 【80MPa 】

4、 问题:In the illustrated truss structure, three steel rods. Under the condition that other conditions remain unchanged, after replacing rod 3 with aluminum rod, the axial force on rod 1 and rod 2 will be      .
选项：
A:Decreased
B:Constant
C:Increased
D:unconfirmed
答案: 【Increased】

5、 问题:The force of the rod is shown in the figure. If the cross-sectional areas of the AB and BC sections are 2A and A, and the elastic modulus is E, then the displacement of the section C is   .
选项：
A:0
B:
C:
D:
答案: 【】

6、 问题:Hook’s law holds within the            .
选项：
A:Elastic limit
B: Proportional limit
C:Yield limit
D:Strength limit
答案: 【 Proportional limit 】

7、 问题:According to the stress-strain diagram shown in the figure, it can be judged that the nominal yield limit σ0.2 of the material is equal to     MPa.
选项：
A:200
B:260
C:300
D:330
答案: 【330】

8、 问题:Compared with plastic materials, the biggest characteristic of the tensile mechanical properties of brittle materials is     . 
选项：
A:Low intensity
B:Small deformation under the same tension
C:There is almost no plastic deformation before fracture
D:The stress-strain relationship strictly follows Hooke’s law
答案: 【There is almost no plastic deformation before fracture】

9、 问题:The variable cross-section rod is shown in the figure. Given that  and ,  the maximum normal stress in the rod is             MPa.
选项：
A:80
B:100
C:120
D:150
答案: 【150】

10、 问题:As shown in the figure, the connector is known: load F = 60kN, plate width b = 80mm, plate thickness δ = 10mm, rivet diameter d = 12mm, allowable stress [σ] = 160MPa, allowable shear stress [τ] = 120MPa , allowable extrusion stress [σbs]= 240MPa, the material of the plate and the rivet is the same, the following statement               is correct.
选项：
A:The strength of the connector is 
B:Shear strength of the rivet is not satisfied
C:The bearing strength of the rivet is not satisfied
D:The tensile strength of the plate is not satisfied
答案: 【Shear strength of the rivet is not satisfied 】

3. Torsion Unit Test of Chapter 3

1、 问题:The power of the motor’s rotor shaft is 150kW and the speed is 15.4 r/s. What is the magnitude of the torque moment produced by this axis? (     )
选项：
A:93 kN·m
B:1.55 kN·m
C:68.4 kN·m 
D:1.14 KNN·m 
答案: 【1.55 kN·m】

2、 问题:is the torsional shear stress formula of the shaft. The shaft with           cross section is applicable to this formula。
选项：
A:rectangular
B:elliptical
C:circular 
D:any shaped
答案: 【circular 】

3、 问题:The outer diameter of the hollow circular axis with equal section is D, and the inner diameter is d=D/2, the ends of the shaft are subjected to a torsion couple. The maximum shear stress on its cross section is equal to         .
选项：