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The shear force applied is 1000 N and the cross section area is 28 mm.

So the shear force applied is 1000/28 N/mm^2 = 35.7 N/mm^2.

As far as I'm concerned the shear modulus tells me how much force I can apply per mm^2 before it fractures. Am I right?

Material: PVC

E-modulus: 1300 N/mm^2

Poisson's ratio: 0.35

Applied shear force: 100 N

Resisting area: 28 mm^2

Shear modulus: E = 2G(1+v) --> G = E/(2(1+v)) = 1300/(2(1+0.35) = 481 N/mm^2