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Unformatted text preview: = (σ xx + σ yy )/2 + ½ (σ xx σ yy ) cos (40 o ) + σ xy sin (40 o ) But we also know KNOW σ xx = 20 MPa and σ xy = 40 MPa, so that we can actually SOLVE for the unknown stress σ yy ! In general, such problems are called INVERSE PROBLEMS since we are solving for values that we generally know and hence we have to invert the equation to obtain the value needed. \ 70MPa 40MPa 20MPa σ yy X Y 20 o...
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 '11
 SUTTON
 unknown stress, unknown stress σyy

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