4.2. Defining the Bilinear Kinematic Hardening Model

Define the isotropic or anisotropic elastic behavior via MP commands.

Bilinear kinematic hardening is defined by providing the tangent modulus (TB,BKIN).

The constants can be defined as a function of temperature (TB,,,NTEMP), with temperatures specified for the table entries (TBTEMP).

NTEMP:

Number of temperatures for which data will be provided. Default = 1. Maximum = 6.

NPTS:

Not used.

TBOPT:

Stress-strain options.

0 --: No stress relaxation with temperature increase (not recommended for nonisothermal problems).
1 --: Rice's hardening rule, which takes into account stress relaxation with increasing temperature (default).

References:

Bilinear Kinematic Hardening in the Material Reference

Defining the Bilinear Kinematic Hardening Model

After defining the material data table (TB,BKIN), input the following constants (TBDATA):

Constant	Meaning	Property
C1		Initial yield stress
C2		Tangent modulus

This model can be used with TB,,,,,TBOPT:

For TBOPT ≠ 1, no stress relaxation occurs with an increase in temperature. This option is not recommended for non-isothermal problems.

For TBOPT = 1, Rice's hardening rule is applied, which accounts for stress relaxation with temperature increase.