大学MOOC Experiment of Engineering Mechanics(Nanchang University)1458208167 最新慕课完整章节测试答案
01 Tensile test of metal materials（金属材料拉伸实验）
文章目录
- 01 Tensile test of metal materials（金属材料拉伸实验）
- 02 Compression test of metal materials（金属材料压缩实验）
- 03 Torsion test of metal materials（金属材料扭转实验）
- 04 Installation of Strain gages（应变片粘贴实验）
- 05 Tensile test of Non-metallic materials（非金属材料拉伸实验）
- 06 Bending test of metal materials（弯曲正应力电测实验）
- 07 Bending test of composite beam（叠合梁弯曲的应力分析实验）
- 08 Deformation experiment of thin-walled round tube under combined load of bending and torsion（弯扭组合变形的主应力测定）
- 09 Eccentric Tensile test（偏心拉伸实验）
- 10 Stability test of ideal column（压杆稳定实验）
- 11 Measurement test of natural frequency and damping ratio of single degree of freedom system（单自由度系统固有频率和阻尼比的测量）
Data Processing of Virtual Tensile Test of Low Carbon Steel（低碳钢拉伸实验数据处理）
1、填空题：
答案: 【 [190,200]】
2、填空题：
(2) The yield limit of the material is ( ) MPa; (材料屈服极限是___MPa)
答案: 【 [284,292]】
3、填空题：
(3) The strength limit of the material is ( ) MPa; (材料的强度极限是___MPa)
答案: 【 [413,422]】
4、填空题：
(4) The percentage reduction of area is ( ). (断面收缩率是___)
答案: 【 [0.6,0.61]】
5、填空题：
(5) The percentage elongation after fracture is ( ); (伸长率为___)
答案: 【 [0.20,0.22]】
02 Compression test of metal materials（金属材料压缩实验）
Data Processing of Virtual CompressionTest of Low Carbon Steel（低碳钢压缩实验数据处理）
1、填空题：
(材料的强度极限是_____MPa)
答案: 【 [298,302]】
2、填空题：
(2) The elongation rate is ( ); （延伸率是____）
答案: 【 [0.034,0.036]】
3、填空题：
(3) The section shrinkage is ( ). (断面收缩率为______ )
答案: 【 [0.028,0.03]】
03 Torsion test of metal materials（金属材料扭转实验）
Data Processing of Virtual Torsion Test of Low Carbon Steel（低碳钢扭转虚拟仿真实验数据处理）
1、填空题：
（低碳钢剪切弹性模量G是____GPa）
答案: 【 [87,92]】
2、填空题：
(2) The shear yield limit is ( ) MPa . ( 剪切屈服极限为___MPa )
答案: 【 [154,180]】
3、填空题：
(3) The shear strength limit is ( ) MPa. ( 剪切强度极限为____MPa )
答案: 【 [470,486]】
4、填空题：
(4) The theoretical value of material shear modulus of elasticity is ( ) GPa. ( 材料剪切弹性模量的理论值为____GPa )
答案: 【 [78,82]】
5、填空题：
(5) The relative error between the test value and the theoretical test of the shear modulus of elasticity is ( )%.（note：absolute value） ( 剪切弹性模量测量值与理论值相对误差的绝对值为____% )
答案: 【 [8,14]】
04 Installation of Strain gages（应变片粘贴实验）
exercises of unit 4
1、单选题：
The sensitivity factor K of the strain gauge refers to （应变片的灵敏度系数是指____）
选项：
A: resistance value (电阻值)
B: Relative resistance change of strain gauge caused by unit strain (单位应变引起的应变片相对电阻变化)
C: The relative change of the cross-sectional area of the strain gauge wire (应变片导线截面积的相对变化)
D: Relative change of resistance value of strain gauge wire (应变片电阻值的相对变化)
答案: 【 Relative resistance change of strain gauge caused by unit strain (单位应变引起的应变片相对电阻变化)】
2、单选题：
Four resistance strain gauges R1, R2, R3 and R4 are attached to four points of a component. The strains of the four points measured by the single-point method(half-bridge with temperature compensation ) are ε1 = 300με, ε2 = -300με, ε3 = 400με, ε4 = -400με. If these four strain gauges are connected into a full bridge as shown in the figure followed, the reading will be ( ) με. (四个电阻应变片R1，R2，R3和R4连接成四点的桥路。 用单点法（带温度补偿的半桥）测得的四个点的应变为ε1=300με，ε2=-300με，ε3=400με，ε4=-400με。 如果按下图所示将这四个应变仪连接到一个全桥中，则读数将为____με。)
选项：
A: 1400
B: 600
C: 800
D: 0
答案: 【 1400】
3、单选题：
The strain measured by the resistance strain gauge is
选项：
A: the average strain in sensitive grid area
B: the average strain in base area of the strain gauge
C: the strain at the center of the sensitive grid
D: the average strain at the two ends of the sensitive grid length
答案: 【 the average strain in sensitive grid area】
4、单选题：
What the resistance strain gauge measures is （ ）
选项：
A: Shear strain
B: Shear stress
C: Linear strain
D: Normal stress
答案: 【 Linear strain】
5、单选题：
Two strain gauges R1 and R2 on the tensile test piece shown in the following figure, are perpendicular to each other. using the half-bridge method, R1 is connected to the AB bridge, and R2 is connected to the BC bridge. Apply a tensile force F.Tthe strain values of R1 and R2 are ε1 and ε2, respectively. If the Poisson's ratio of the material is μ, the reading strain εr =
选项：
A: ε1 + ε2
B: (1+μ) ε1
C: (1-μ) ε1
D: (1+μ) ε2
答案: 【 (1+μ) ε1 】
6、填空题：
When measuring strain with electronic methods, in order to eliminate the influence of ambient temperature changes , compensation need to be performed to get accurate strain produced by force.
答案: 【 temperature】
7、填空题：
A strain gauge is installed on a compressed specimen. Its original resistance is 120Ω and a gage factor K = 2.06. If the strain of the test part along the gage direction is -1000×10-6, the resistance value of the strain gauge should be Ω
答案: 【 [119.7,119.8]】
8、填空题：
The three basic requirements that the temperature compensation plate must meet are:(1) The of the compensation plate should be the same as the test part. and plate are not ;(2) The compensating gauge attached to it and the working gage are at the same environment;(3) Compensating gage and working gauge should be from the same and are of the same .
答案: 【 material ,stressed,temperature,batch,model】
9、填空题：
In engineering tests, the three common bridges used for strain measuring are: _____, ____ and _____.
答案: 【 quarter bridge,half bridge,full bridge】
10、填空题：
The sensitivity coefficient of the strain gauge Ks = 2.00, the sensitivity coefficient of the strain gauge Kg = 2.08, when the reading on the strain instrument ε = 400με, the actual strain value of the strain gage is με.
答案: 【 [384,386]】
05 Tensile test of Non-metallic materials（非金属材料拉伸实验）
Calculate the Poisson's ratio of non-metallic material （数据分析：计算非金属材料泊松比）
1、填空题：
答案: 【 [0.38,0.385]】
06 Bending test of metal materials（弯曲正应力电测实验）
Experimental data analysis（实验数据分析）
1、填空题：
1.Bending test of metallic material（金属材料弯曲试验）
In the bending test of metallic materials,the material of the beam is selected as low carbon steel,so the Elasticity modulus is set as 210GPa.As shown in the figure,a=125mm,b=20mm and h=40mm.
（在某金属材料弯曲试验中，横梁材料为低碳钢，其弹性模量为210GPa。如图所示，a=125mm，b=20mm，h=40mm。）
The measured data of five strain gages are listed in the in the following tables（五个测点应变测量数据如下表所示）:
Please answer the following questions（请回答以下问题）:
（1） At the point 1,the stress increment 
calculated by the test data is （ ）MPa.
（在测点1，根据测试数据计算出的应力增量
是 MPa）
All calculation results shall retain two significant digits after the decimal point（所有计算结果应保留小数点后两位有效数字）
答案: 【 [-4.75,-4.7]】
2、填空题：
(2) At the point 1, the stress increment 
calculated by the bending normal stress formula of beam is ( )MPa.
（在测点1，根据纯弯曲横梁正应力公式计算出的应力增量是 MPa）
答案: 【 [-5.16,-4.22]】
3、填空题：
（3） At the point 1,the relative error 
is （）%.
（在测点1，相对误差是 %）
答案: 【 [-0.87,-0.72]】
4、填空题：
（在测点2，根据测试数据计算出的应力增量是 MPa）
答案: 【 [-2.6,-2.1]】
5、填空题：
（在测点2，根据纯弯曲横梁正应力公式计算出的应力增量是 MPa）
答案: 【 [-2.58,-2.11]】
6、填空题：
（在测点2，相对误差为 %）
答案: 【 [-0.873,-0.714]】
7、填空题：
（在测点3，根据测试数据计算出的应力增量是 MPa）
答案: 【 0】
8、填空题：
（在测点3，根据纯弯曲横梁正应力公式计算出的应力增量是 MPa）
答案: 【 0】
9、填空题：
（在测点4，根据测试数据计算出的应力增量是 MPa）
答案: 【 [2.3,2.32]】
10、填空题：