第二章单元测试
- Stress state softness coefficient can be defined as the ratio of maximum normal stress to maximum shearstress.（ ）
- Only brittle materials have compressive strength.（ ）
- The deformation of plastic material is much larger than that of brittle material,its plastic is better.（ ）
- Brittle materials of compression test is cut along the axis at 60°.（ ）
- The compressive strength of brittle materials is generally （ ） than its tensile strength.。
- The torsion test fracture surface of the plastic material is perpendicular to the axis of the sample, and the fracture is coarse.（ ）
- 脆性材料的缺口拉伸试样抗拉强度低于光滑试样.（ ）
- 缺口静载实验包括（ ）。
- HBW是布氏硬度的淬火钢球压头.（ ）
A:错 B:对
答案:错
A:对 B:错
A:对 B:错
A:对 B:错
A:lower B:equal C:higher
A:错 B:对
A:错 B:对
A:缺口静载完曲 B:缺口静载拉伸 C:缺口压缩 D:缺口偏斜拉伸
A:错 B:对
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