2021 Mechanics of Materials （《材料力学》全英文）(北京理工大学) 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2021-07-02

【作业】Chapter 1： Stress Homework assignments for Chapter 1

1、 问题:The questions of the homework assignment are given in the PPT
评分规则: 【 If the student submits the solution sheet of the homework assignment or the graded record before the due date: 5 points; or 0 point
】

2、 问题:The questions of the homework assignment are given in the PPT
评分规则: 【 If the student submits the solution sheet of the homework assignment or the graded record before the due date: 5 points; or 0 point
】

3、 问题:The questions of the homework assignment are given in the PPT
评分规则: 【 If the student submit the solution sheet of the homework assignment or the graded record before the due date: 5 points; or 0 point
】

Chapter 1： Stress The small quiz for Chapter 1

1、 问题:Mechanics of materials is a study of the relationship between the (                           ) applied to a body and the (                ) and (               ) caused by the (                     ) within the body.
选项：
A:loads, stress, strain, loads 
B:external loads, stress, strain, internal loads
C:internal loads, deformation, force, external loads
D:external loads, force, deformation, internal loads
答案: 【external loads, stress, strain, internal loads】

2、 问题:Linear distributed loadings produce a (                  ) having a magnitude equal to the (                      ), and having a location that passes through the (                         ).
选项：
A:resultant force, external force, center of the area
B:force, external force, centroid of this area
C:resultant force, area under the load diagram, centroid of this area
D:resultant force, external force, centroid of this area
答案: 【resultant force, area under the load diagram, centroid of this area】

3、 问题:A support produces (                ) in a particular direction on its attached member if it prevents (            ) of the member in that direction, and it produces (                     ) on the member if it prevents (              ). 
选项：
A:an external force, translation, an external couple moment, rotation
B:an internal force, translation, an internal couple moment, rotation
C:an internal force, movement, a couple moment, translation 
D:an external force, translation, an internal couple moment, translation 
答案: 【an external force, translation, an external couple moment, rotation】

4、 问题:The method of sections is used to determine the (                     ) acting on the surface of the sectioned body. In general, these resultants consist of a (                   ), (                      ), (                     ), and bending moment.
选项：
A:resultant loadings, force along x, a force along y axis, torsional moment
B:resultant loadings, normal force, shear force, external couple
C:external resultant loadings, normal force, shear force, torsional moment
D:internal resultant loadings, normal force, shear force, torsional moment
答案: 【internal resultant loadings, normal force, shear force, torsional moment】

5、 问题:The intensity of the (                         ) at a point in the body is referred to as stress. Stress is the (                ) value of force per unit area, as the area approaches (                  ). For this definition, the material is considered to be (                        ) and (                      ).
选项：
A:internal force, limiting, zero, continuous, cohesive
B:external force, limiting, a specific value, continuous, cohesive
C:internal force, a fixed, zero, continuous, cohesive.
D:external force, limiting, zero, discontinuous, linear
答案: 【internal force, limiting, zero, continuous, cohesive】

6、 问题:When a prismatic bar is made from (                           ) and (                      ) material, and is subjected to an axial force acting through the (                   ) of the cross-sectional area, then the center region ofthe bar will deform (                      ). As a result, the material will be subjected only to (                   ). This stress is (                     )   or averaged over the cross-sectional area.
选项：
A:unhomogeneous, anisotropic, centroid, uniformly, normal stress, uniform
B:homogeneous, isotropic, centroid, uniformly, normal stress, uniform
C:homogeneous, anisotropic, centroid, uniformly, shear stress, uniform
D:homogeneous, isotropic, centroid, uniformly, shear stress, nonuniform
答案: 【homogeneous, isotropic, centroid, uniformly, normal stress, uniform】

7、 问题:When shear stress acts on a plane, then (                    ) of a volume element of material at a point on the plane requires associated (                        ) of the (                      ) act on three adjacent sides ofthe element.
选项：
A:equilibrium, normal stress, same magnitude
B:equilibrium, shear stress, same magnitude
C:equilibrium, normal stress, same orientation
D:equilibrium, normal stress, same orientation
答案: 【equilibrium, shear stress, same magnitude】

8、 问题:Design of a member for strength is based on selecting an (                       ) that will enable it to safely support its intended load. Since there are many unknown factors that can influence the actual stress in a member, then depending upon the intended use of the member, (                          ) is applied to obtain the (                          ) the member can support.
选项：
A:allowable stress, a factor of safety, allowable load
B:allowable force, a factor of safety, allowable load
C:allowable force, a factor, allowable load
D:allowable stress, a factor, allowable load
答案: 【allowable stress, a factor of safety, allowable load】

【作业】Chapter 2： Strain Homework assignment for Chapter 2

1、 问题:The homework assignments are given from the text book. 
评分规则: 【 Once the student submits the solution or the record for the submission is given: 10 points; or 0 point 
】

Chapter 2： Strain A small quiz for Chapter 2

1、 问题:(                         ) is a measure per unit length of the elongation or contraction of a small line segment in the body, whereas (                           ) is a measure of the change in (                  ) that occurs between two small line segments that are originally (                      ) to one another.
选项：
A:Normal strain, shear strain, angle, perpendicular
B:Shear strain, normal strain, angle, perpendicular
C:Normal strain, shear strain, length, perpendicular
D:Shear strain, normal strain, length, perpendicular
答案: 【Normal strain, shear strain, angle, perpendicular】

2、 问题:The state of strain at a point is characterized by (            )  strain components: (           ) normal strains and (              ) shear strains. These components depend upon the original (                 ) of the line segments and their (                   ) in the body.
选项：
A:nine, three, six, orientation, location
B:six, three, three, orientation, location
C:six, three, three, orientation, length
D:nine, three, six, orientation, length
答案: 【six, three, three, orientation, location】

3、 问题:When force P is applied to the rigid lever arm ABC in the given figure, the arm rotates counterclockwise about pin A through an angle of 0.05°.  The normal strain developed in wire BD is (               ).
选项：
A:0.116 mm/mm
B:0.00232 mm/mm
C:0.0116 mm/mm
D:0.00116 mm/mm
答案: 【0.00116 mm/mm】

4、 问题:The slender rod shown in the given figure is subjected to an increase of temperature along its axis, which creates a normal strain in the rod of where z is measured in meters. The displacement of the end B of the rod due to the temperature increase is (               ) and the average normal strain in the rod is  (                     ). 
选项：
A:2.39 mm (downward),  0.0119 mm/mm
B:2.39 m (downward),  0.0119 mm/mm
C:2.39 mm (upward),  0.119 mm/mm
D:2.39 mm (upward),  0.0119 mm/mm
答案: 【2.39 mm (downward),  0.0119 mm/mm】

5、 问题:The rigid beam is supported by a pin at A and wires BD and CE. If the distributed load causes the end C to be displaced 20 mm downward, the normal strain developed in wires DB is (                ) and in wire CE is (                   ).
选项：
A:0.00266 mm/mm, 0.001 mm/mm
B:0.00533 mm/mm, 0.005 mm/mm
C:0.00533 mm/mm, 0.01 mm/mm
D:0.00266 mm/mm, 0.005 mm/mm
答案: 【0.00533 mm/mm, 0.01 mm/mm】

【作业】Chapter 3： Mechanical Properties of Materials Homework assignments given in the textbook for Cha

1、 问题:Homework assignments are given from the the textbook of the course
评分规则: 【 Once the student submits the solution of the homework or the submission record is provided: 10 points, or 0 point
】

2、 问题:Homework assignments are given from the the textbook of the course
评分规则: 【 Once the student submits the solution of the homework or the submission record is provided: 10 points, or 0 point.
】

3、 问题:Homework assignments are given from the the textbook of the course
评分规则: 【 Once the student submits the solution of the homework or the submission record is provided: 10 points, or 0 point.
】

Chapter 3： Mechanical Properties of Materials A small quiz for Chapter 3

1、 问题:The point of (                    ) on the stress-strain diagram represents the proportional limit and the ultimate stress. 
选项：
A:A, B
B:B, C
C:A, D
D:B, E
答案: 【A, D】

2、 问题:The material for the 50-mm-long specimen has the stress–strain diagram shown. If  P = 100kNm the elongation of the specimen is (             ).
选项：
A:0.0796 mm
B:0.001592 mm
C:318.31 MPa
D:0.01592 mm
答案: 【0.0796 mm】

3、 问题:A 100-mm long rod has a diameter of 15 mm. If an axial tensile load of 20 kN is applied to it, the change in its diameter is (                      ). E = 70 GPa,  = 0.35. 
选项：
A:
B:
C:
D:
答案: 【】

4、 问题:If the elongation of wire BC is 0.3 mm after the force P is applied, the magnitude of P is (                 ). The wire is A-36 steel and has a diameter of 3 mm.
选项：
A:942 N
B:628 N
C:1256 N
D:314 N
答案: 【942 N】

5、 问题:A 150-mm long rod has a diameter of 10 mm. If an axial tensile load of 150 kN is applied,  its change of length is (                   ). E = 200 GPa. It is assumed that material behavior is linear elastic. 
选项：
A:0.2829 mm
B:1.4324 mm
C: 0.6366 mm
D:  0.4244
答案: 【1.4324 mm】

6、 问题:A 20-mm-diameter brass rod has a modulus of elasticity of  E = 100 GPa If it is 4 m long and subjected to an axial tensile load of 12 kN, its elongation is (                    )
选项：