第四章单元测试
- Which is not the characteristic of unloading （ ）
- The characteristics of hysteresis loop are as follows （ ）
- The correct conclusions about data fitting are as follows （ ）
- The rate or amount of relaxation depends on the magnitude of plastic strain amplitude. （ ）
- Incremental-step test method: A series of specimens, each of which is subjected to a constant strain amplitude. （ ）
A:Parallel to the initial elastic loading line B:The slope is the modulus of elasticity C:Permanent deformation D:Elastic
答案:Permanent deformation
A:"Lag" phenomenon B:Progressive changes in the stress-strain behavior C:Area within hysteresis loop is energy per unit volume dissipated during a cycle D:Different strains, different hysteresis loops
A:Inaccuracies in measuring small plastic strains at low loads can influence the test results B:Fatigue life as the dependent variable C:The stress and plastic strain amplitudes should be treated as independent variables D:Stress relaxation is different from cyclic softening
A:错 B:对
A:错 B:对
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