GGU-ELASTIC: Signs and designations
The following sign rules are valid:
displacement wx and wy e.g. in [m] positive in positive axis direction
point loads Px and Py e.g. in [kN] positive in positive axis direction.
stresses positive when tensile
strains positive when tensile
Further designations:
x, y = coordinates
E = Young's modulus e.g. in [kN/m²]
Designation of stresses for plane strain conditions:
sig x = stress in x - direction
sig y = stress in y - direction
sig z = stress in z – direction (normal to plane of observation)
sig 1 and sig 2 = principal stresses
tau xy = shear stress in plane of observation
Designation of stresses for axis-symmetrical strain conditions:
For axis-symmetrical strain conditions the horizontal axis is r and the vertical axis is z. The rotational axis is at r = 0.0 m (of course).
sig r = stress in r – direction (horizontal)
sig z = stress in z – direction (vertical)
sig t = stress in t – direction (normal to plane of observation)
sig 1 and sig 2 = principal stresses
tau rz = shear stress in plane of observation
The program works with true dimensions. This means that you can freely choose the dimensions for force and length. If, for example, you decide on [kN] and [m], all input must be in these dimensions (e.g. then, Young’s modulus in kN/m²).
The friction angle should always be given in sexagesimal degrees (right angle = 90°).