Question: At a point on the surface of a machine the material is in biaxial stress with (x = 3600 psi, and (y = - 1600

At a point on the surface of a machine the material is in biaxial stress with (x = 3600 psi, and (y = - 1600 psi, as shown in the first part of the figure. The second part of the figure shows an inclined plane aa cut through the same point in the material but oriented at an angle (.
Determine the value of the angle between zero and 90o such that no normal stress acts on plane aa. Sketch a stress element having plane as one of its sides and show all stresses acting on the element?

1600 psi 3600 psi

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