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Unformatted text preview: = ( xx + yy )/2 + ( xx yy ) cos (40 o ) + xy sin (40 o ) But we also know KNOW xx = 20 MPa and xy = 40 MPa, so that we can actually SOLVE for the unknown stress 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 yy X Y 20 o...
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This note was uploaded on 12/12/2011 for the course EMCH 260 at USC.
 '11
 SUTTON

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