The general three-dimensional state of stress at a point can be represented by an element oriented so that only ( ) act on it.
A: three principal stresses
B: two principal stresses and one shear stress
C: six principal stresses
D: three absolute maximum shear stresses
A: three principal stresses
B: two principal stresses and one shear stress
C: six principal stresses
D: three absolute maximum shear stresses
举一反三
- If a circular shaft is under torsion, then there should be only shear stresses and no normal stresses on its cross section. A: 正确 B: 错误
- Structural stress levels in a ship are the sum of loading stresses and stresses due to（）. A: environmental loads B: variable loads C: ballast loading D: mooring load
- For the element shown, its principal stresses should be[img=328x428]1803a4798417ffe.png[/img] A: [img=442x66]1803a4798e3ce07.png[/img] B: [img=491x67]1803a47998710f0.png[/img] C: [img=491x66]1803a479a38075f.png[/img] D: [img=501x71]1803a479ae0ebe1.png[/img]
- For the element shown, its principal stresses should be[img=328x428]1803277f7df875a.png[/img] A: [img=442x66]1803277f889e650.png[/img] B: [img=491x67]1803277f9403812.png[/img] C: [img=491x66]1803277f9f2fed8.png[/img] D: [img=501x71]1803277faad5f49.png[/img]
- According to Maximum Principal Stress theory (also known as Rankine's theory of failure), elastic failure occurs ( ) A: when the minor principal stress is equal to the elastic limits value in a simple tension test B: when the greatest principal stress reaches the elastic limit value in simple tension test C: when the greatest principal stress is equal to the stress corresponding to the upper yield limit in a tension test D: none of the above