A metal is yielding plastically under the stress state shown in the accompanying figure.

(a) Label the principal axes according to their proper numerical convention (1, 2, 3).
(b) What is the yield stress using the Tresca criterion?
(c) What if the von Mises criterion is used?
(d) The stress state causes measured strains of ε1 = 0.4 and ε2 = 0.2, with ε3 not beign measured. What is the value of ε1?

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20 MPa 40 MPa 50 MPa