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Question

A block 100 mm 100 mm base and 10 mm height. When we apply a tangential force 10 kN to the upper edge it is displaced 1 mm relative to lower face.Then the direct shear stress in the element is:

A
0.2
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B
0.1
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C
0.02
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D
0.01
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Solution

The correct option is B 0.1
In ΔABC tanr=110

For small angles tanr=r

Shear strain r=110=0.1

Shear stress=Force appliedArea on which force is applied

=10×103100×100mm2

=1N/mm2=1MPa

Stress(Shear)=1MPa

Strain(Shear)=0.1.

1489223_596094_ans_dcf236d9d4034b829d0dec3a9fd9d0ae.png

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