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Question

At a certain point in a strained material, the intensities of stresses on two mutually perpendicular planes are 150 N/mm2 (tensile) and 70 N/mm2 (tensile). If the maximum shear stress is 60 N/mm2. The shear stress on these planes will be nearly

A
40 N/mm2
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B
92.19 N/mm2
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C
44.7 N/mm2
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D
60 N/mm2
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Solution

The correct option is C 44.7 N/mm2

τmax=(σxσy2)2+τ2xy

σx=150 N/mm2 (Tensile)

σy=70 N/mm2 (Tensile)

τmax=6 N/mm2

τxy=?

60=(150702)2+τ2xy

60=(40)2+τ2xy

τ2xy=602402

τxy=44.72 N/mm2


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