Fatigue Life Design of Mechanical Structure答案2023

第六章测试

1. The incorrect statement is （ ）
A:The characteristic length depends on the material B:Brittle material: the notch effect is more pronounced at short lives C:Geometric discontinuities cause stress concentration D:Notched fatigue strength only depends on the stress concentration factor
答案:D
2. Three principle parameters in Haigh diagram contain （ ）
A:Nominal stress amplitude B:Tensile strength C:Net regional mean stress D:Notch factor 3. The description of Neuber’s rule is as follows （ ）
A:The most widely used model B:Plane stress situation C:Plane strain situation D:Related strain-stress curve is a hyperbola 4.null
A:对 B:错 5. The notched fatigue strength maybe a greater fraction of the smooth fatigue strength. （ ）
A:错 B:对