第六章单元测试
- The incorrect statement is （ ）
- Three principle parameters in Haigh diagram contain （ ）
- The description of Neuber’s rule is as follows （ ）
- null
- The notched fatigue strength maybe a greater fraction of the smooth fatigue strength. （ ）
A:Notched fatigue strength only depends on the stress concentration factor B:The characteristic length depends on the material C:Brittle material: the notch effect is more pronounced at short lives D:Geometric discontinuities cause stress concentration
答案:Notched fatigue strength only depends on the stress concentration factor
A:Net regional mean stress B:Tensile strength C:Nominal stress amplitude D:Notch factor
A:The most widely used model B:Related strain-stress curve is a hyperbola C:Plane strain situation D:Plane stress situation
A:错 B:对
A:错 B:对
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