举一反三
- Which of the following statements are correct? A: The greater the modulus, the stiffer the material. B: The stiffer the material, the higher the resistance of the material to deformation. C: The higher the magnitude of elastic modulus, the higher the magnitude of the inter-atomic bonding forces in a material. D: The higher the magnitude of elastic modulus, the lower the magnitude of the intermolecular bonding forces in a material.
- 5. (5.0 points )Steel is outstanding as a structural material, because it never deforms and can thus be used in skyscrapers.
- The critical pressure of the compression bar is directly proportional to the elastic modulus of the material
- In conventional reinforced concrete, the high tensile strength of steel is combine with concrete's great ________________ to form a structural material that is strong in both ________ and ________.
- Based on the assumption of homogenousity (匀质性),( ) is the same over the loaded body. A: stress B: strain C: elastic modulus of the material D: displacement
内容
- 0
In the fixedly combined circular shaft shown in the figure, the central part of the material is steel, shear modulus G1=80GPa, the outer material is copper and the shear modulus G2=39GPa. The distribution of shearing stress on cross section is___after torsional deformation. ① ② ③ ④http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/e48a2be70d9f4eec8d38b0270076b6e2.png
- 1
Material properties depend on the material microstructure, which in turn results from its compositions and processing.
- 2
A ferromagnetic material, which is hard to magnetize and demagnetize, could be used as a computer memory material.
- 3
The stratification of parent material (heterogeneous parent material) has a more complex influence on the material migration and soil fertility, compared with homogeneous parent material. The stratification of parent material will be inherited to soil.
- 4
Which of the following factors contribute to the displacements of a material point? A: Rigid-body translations B: Rigid-body rotations C: Strain deformations D: None