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*BUCKLING ENVELOPE
Define a nondefault buckling envelope for buckling strut response of frame elements with PIPE sections.

This option is used to define the coefficients characterizing the buckling strut envelope for the buckling strut response of frame elements. It can be used in conjunction with the *FRAME SECTION, SECTION=PIPE, YIELD STRESS= option with or without the PINNED parameter.

Product: Abaqus/Standard  

Type: Model data

Level: Part,  Part instance  

References:
There are no parameters associated with this option.

Data line to define the buckling strut envelope: 

First (and only) data line:

  1. , coefficient defining (default value 0.95).

  2. , coefficient defining the isotropic hardening slope (default value 0.02).

  3. , coefficient defining (default value 0.03).

  4. , coefficient defining (default value 0.004).

  5. , coefficient defining compressive force for discontinuity in buckling envelope (default value 0.28).

  6. , buckling envelope slope coefficient (default value 0.02).

  7. , coefficient defining the force axis intercept point (default value ).

In the above data line A is the cross-section area, is a yield stress value, E is Young's modulus, L is the element length, D is the outer pipe diameter, and t is the pipe wall thickness.