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In a bi-axial stress system the stresses along the two directions are σx=60N/mm2 (tensile) and σy=40N/mm2 (Compressive).Find the max strain.Take E=200kN/mm2 , m=4.
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ex=(σxE)(μσyE) =1E(σxμ×σy)

=1200×103(60+0.25×40) ex=3.5×104

ey=(σyE)(μσxE) =1E(σyμ×σx)

=1200×103(400.25×60) ey=2.75×104

Maximum strain is ex=3.5×104

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