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INITIAL_PLASTIC_STRAIN_FUNCTION

Initial conditions

*INITIAL_PLASTIC_STRAIN_FUNCTION
coid, entype, enid, fid, multi

Parameter definition

Variable
Description
coid
Command ID
entype
Entity type
options: P, PS, G, ALL
enid
Entity ID
fid
ID of FUNCTION defining the effective plastic strain as function of $(x,y,z)$
multi
Treatment of multiple commands
options:
0 $\rightarrow$ plastic strains from previous commands are overwritten
1 $\rightarrow$ plastic strains from multiple commands are superposed

Description

This command is used to prescribe or add initial plastic strains to finite elements.

The referenced FUNCTION defines the spatial variation as a function of the location in space $(x,y,z)$ and the values are assigned at the element integration points. Parameter multi controls whether this command overwrites plastic strain from earlier commands or superposes multiple initial strain fields.

Example

Multiple initial plastic strains

Two bars are given initial plastic strains. The plastic strains are assigned with two linearly increasing functions along their lengths. The first function goes from 0 to 0.05 and the second function goes from 0 to 0.10.

The option multi is set to 0 (plastic strains from previous commands are overwritten) for bar 1 and set to 1 (plastic strains from multiple commands are superposed) for bar 2.

*UNIT_SYSTEM SI *PARAMETER %L = 1.0, "Length of bar" %T = 0.05, "Thickness of bar" %epsp = 0.05, "First applied plastic strain" %epsp_2 = 0.1, "Second applied plastic strain" %tend = 0.001, "Termination time" # # --- TIME and OUTPUT --- # *TIME [%tend] *OUTPUT [%tend] # # --- MESH --- # *COMPONENT_BOX 1, 1, 50, 1, 1 0, [-%T/2], [-%T/2], [%L], [%T/2], [%T/2] *COMPONENT_BOX 2, 2, 50, 1, 1 0, [2*%T+%T/2], [-%T/2], [%L], [%T+%T/2], [%T/2] *CHANGE_P-ORDER ALL, 0, 3 *MAT_METAL 1, 7800, 210e9, 0.3 1 *FUNCTION 1 100e6 *PART 1, 1 2, 1 # # --- FIRST INITIAL CONDITIONS --- # *INITIAL_PLASTIC_STRAIN_FUNCTION 1, P, 1, 101, 0 *INITIAL_PLASTIC_STRAIN_FUNCTION 2, P, 2, 101, 0 *FUNCTION 101 %epsp*(X/%L) # # --- SECOND INITIAL CONDITIONS --- # *INITIAL_PLASTIC_STRAIN_FUNCTION 3, P, 1, 102, 0 *INITIAL_PLASTIC_STRAIN_FUNCTION 4, P, 2, 102, 1 *FUNCTION 102 %epsp_2*(X/%L) *END