A thin rubber membrane is stretched in such a manner

A thin rubber membrane is stretched in such a manner that the following uniform strain field is produced: Exx=2500 microstrain, Eyy=-3000 microstrain, Gamma(XY)=1000 microstrain

A rectangle is drawn on the membrane before stretching. How should the rectangle be oriented if the angles are to remain 90 degrees during stretching?

A rectangle is drawn on the membrane before stretching. How should the rectangle be oriented if the angles are to remain 90° 


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