A: normal
B: shear
C: elastic
D: plastic
举一反三
- Due to the pure bending deformation, the longitudinal ( ) strain varies ( ) from ( ) at the neutral axis to a maximum at the outer fibers of the beam. A: normal; linearly; zero B: shear; nonlinearly; zero C: shear; nonlinearly; zero D: shear; nonlinearly; zero
- The flexure formula is based on the requirement that the ( ) on the cross section is equal to the ( ) produced by the ( ) distribution about the neutral axis.? resultant moment; moment; linear normal stress|resultant moment; moment; nonlinear normal stress|resultant moment; moment; nonlinear shear stress|resultant normal force; force; linear normal stress
- Normal strain cause a change in of the rectangular element, whereas the shear strain cause a change in its .
- The cross section of a straight beam remains plane when the beam deforms due to bending. This causes ( ) on one side of the beam and ( ) on the other side. The neutral axis is subjected to ( ) .? normal stress; shear stress; zero stress|tensile stress; compressive stress; zero stress|compressive stress; tensile stress; maximum normal stress|shear stress; normal stress; zero stress
- On the surface of a perfect conductor, the normal component of the electric displacement vector is A: continuous with the normal component of the electric displacement vector inside the conductor B: uncertain C: equal to the surface density of free charge on the conductor surface. D: equal to zero
内容
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Which of the following statements is correct ? (1) There are two types of stress, normal stress(σ) and shear stress(τ). (2) On one section, the normal stress(σ) and the shear stress(τ) must be perpendicular to each other. (3) On one section, all the normal stress(σ) must be equal in size and same in the direction. (4) On one section, all the shear stress(τ) must be parallel.
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For the concrete pavement with slab of 25cm, the temperature gradient is ______℃/m if the temperatures for the top surface and bottom surface of the slab are 35℃ and 15℃, respectively. A: 80℃/m B: 140℃/m C: 60℃/m D: 140℃/m
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关于波面与波线About Wave Surface and Wave Line A: 波面处处与波线平行；The Wave Surface is parallel to the Wave Line everywhere; B: 波面处处与波线不一定平行；The Wave Surface is not always parallel to the Wave Line; C: 波面处处与波线垂直；The Wave Surface is everywhere perpendicular to the Wave Line; D: 波面处处与波线不一定垂直；The Wave Surface is not always perpendicular to the Wave Line;
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When a shaft having a circular cross section is subjected to a torque, the cross section remains plane while radial lines rotate. This causes a ( ) within the material that varies ( ) along any ( ) line. A: shear strain; linearly; radial B: normal strain; linearly; radial C: shear strain; nonlinearly; radial D: shear strain; nonlinearly; longitudinal
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When the soil reaches the limit equilibrium state, the location of shear failure surface must be on the maximum shear stress surface（ ）