function [StressState] = rain2ess(StrainState,E,poisonts)
%STRAIN2STRESS Converts strain to stress.
% STRAIN2STRESS([EPSX,EPSY,GAMXY],E,POISSONS) Converts a strain state
% to the equivalent stress state.
% EPSX: Normal strain in the X direction.
% EPSY: Normal strain in the Y direction.
% GAMXY: Shear on the X-Y plane.
% Together these three are gathered as the STRAINSTATE.
% E: Young's Modulus
% POISSONS:Poisson's ratio.
% See also MOHRS2, PPSTRAIN, PRISTRAIN, ROSETTE, STRAINTR,
% Details are to be found in Mastering Mechanics I, Douglas W. Hull,
% Prentice Hall, 1998
% Douglas W. Hull, 1998
% Copyright (c) 1998-99 by Prentice Hall
% Version 1.00