A plane-strain compression (forging) of a block is shown in the figure. The strain in the z-direction is zero. The yield strength (Sy) in uniaxial tension/compression of the material of the block is 300 MPa and it follows the Tresca (maximum shear stress) criterion. Assume that the entire block has started yielding. At a point where σx = 40 MPa (compressive) τxy = 0, the stress component σy is ________

A plane-strain compression (forging) of a block is shown in the figure

1.	A plane-strain compression (forging) of a block is shown in the figure. The strain in the z-direction is zero. The yield strength (Sy) in uniaxial tension/compression of the material of the block is 300 MPa and it follows the Tresca (maximum shear stress) criterion. Assume that the entire block has started yielding. At a point where σx = 40 MPa (compressive) τxy = 0, the stress component σy is ________
A.	340 MPa (compressive)
B.	340 MPa (tensile)
C.	260 MPa (compressive)
D.	260 MPa (tensile)
Answer» B. 340 MPa (tensile)

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