抄録
This paper presents a new algorithm to obtain principal stress trajectory grid. Grid points are calculated as the intersections of two mutually orthogonal contour lines in 2D domain of direction functions which are evaluated from the result of FEM. Misalignment with 2D pattern is solved by partitioning the triangular mesh with a line passing through the singular point where the maximum shear stress reaches the minimum value. The magnitude of principal stress is indicated by the line density of equal force grid and the brightness of line color.
