4. METHOD OF SOLUTION
The program uses triangular finite elements. A set of simultaneous equations (stiffness matrix) is set up connecting the total loads at nodal points with the displacements of these points.
These equations are solved using the routine SPARSE, in such a way that additional loading cases may be done with negligible extra running time.
Irregular triangular elements may be used, allowing great flexibility in the representation of irregular bodies.
Arbitrary variation of material parameters is achieved by covering the body with a set of circles, triangles, or squares, within each of which material parameters are prescribed.
Material properties may vary with temperature.