M-Phi diagram for NL releases
Advanced non-linear (NL) analysis can be performed when rotational degrees of freedom are defined using an M-Phi diagram (M - moment [kNm], Phi - rotation [rad]). Within the M-Phi diagram, the rotation Phi is treated as a global parameter:
This option is enabled only when the rotational degree of freedom about the Y axis (My) is defined as a semi-rigid (spring) connection.
Requirements for M-Phi diagram input
1. Continuity: The diagram must be a continuous function with no discontinuity points (must satisfy the continuous function definition).
2. Origin and direction: The curve must pass through the origin (0,0) and must not be defined in the second (II) and fourth (IV) quadrants.
3. Monotonicity: The diagram must be strictly monotonically increasing. Vertical (dX = 0) or horizontal (dZ = 0) branches are not permitted.
- Vertical segments (dX = 0) are not permitted:
- Horizontal segments (dZ = 0) are not permitted:
- The curve must be strictly monotonically increasing. No portion of the diagram may have a negative slope (directed downward):
4. Mandatory origin: The diagram must pass through the origin [0,0]:
- The diagram cannot be defined without passing through the origin:
The availability of Non-linear (NL) Release definitions may be restricted by Technical Module No. 122. If this module is not active, the NL release diagram functionality will be disabled.