单词	shearing force
释义	shearing force A force that acts parallel to a plane rather than perpendicularly, as with a tensile or compressive force. A shear stress requires a combination of four forces acting over (most simply) four sides of a plane and produces two equal and opposite couples. It is measured as the ratio of one shearing force to the area over which it acts, F/(ab) in the diagram. The shear strain is the angular deformation, θ, in circular measure. The shear modulus is the ratio of the shear stress to the shear strain (see also elastic modulus). Shearing force
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