User has to enter the moduli of elasticity Ex and Ey of the material in x-axis and y-axis directions, shear modulus Gxy , as well as Poissonís ratio νyx. The second Poissonís ratio is calculated using formula νxy=νyxEx / Ey. We also check the restriction νxyνyx < 1 for orthotropic material and 0≤ νxy ≤ 0.5 for isotropic material before the calculation. In the case of isotropic material the field for shear modulus can be left blank. Corresponding value will be calculated by formula Gxy=Ex /(1+ νyx)/2 .
Please use the same system of units throughout the calculation. For instance,
if you use force unit N and length unit m, the unit of elasticity modulus should be N/m2.
Obviously, the result of calculation will have the same unit system in this case:
uniformly distributed load Ė N/m.
The program calculates the critical value of load combination, which is represented both graphically and by formulas.