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A metl;lOd is presented !or determilling the s tress-strain relation in shcar for isotropic ~at sheet. rhe me~hod requu·e.s meas urements of deflectJOn or of extreme fiber bending strain m the cen.ter portIOn of a tWlsted sguare plate. The octahedral str ess derived from t he stress-stram curve ll1 shear for a tWlsted plate of aluminum alloy agreed within about 5 perce~t wlth t he. <?ctahedral stress derived from tensile and compressive tes ts of t he same m~terJal. The diiterence was mu ch. gre.a~er for specimens of mild steel with a definite yield POlllt. Unfortl~nately , the method I S chffi cult to perform on thin sheet because of t he small Slze of t he sp eCi men . An cxatatJOn of a ltern ate methods indicates particular promise for t he use of an annu lus of constant thicknc~s.

Twisted square plate method and other methods for determining the shear stress-strain relation of flat sheet