*MAT_124 (PLASTICITY_COMPRESSION_TENSION)

LS-DYNA Input Interface KeywordDefines an isotropic elasto-plastic material with tension and compression yield stress curves as a function of plastic strain.

Rate effects are modeled by Cowper-Symonds models or by curves. Additional viscosity can be defined by Prony series Maxwell model.

Format

(1) (2) (3) (4) (5) (6) (7) (8)
*MAT_124 or *MAT_PLASTICITY_COMPRESSION_TENSION
mat_ID ρ i E ν MathType@MTEF@5@5@+= feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbwvMCKf MBHbqefqvATv2CG4uz3bIuV1wyUbqedmvETj2BSbqefm0B1jxALjhi ov2DaebbnrfifHhDYfgasaacH8WjY=vipgYlh9vqqj=hEeeu0xXdbb a9frFj0=OqFfea0dXdd9vqai=hGuQ8kuc9pgc9q8qqaq=dir=f0=yq aiVgFr0xfr=xfr=xb9adbaGaaiGadiWaamaaceGaaqaacaqbaaGcba GaeqyVd4gaaa@3A61@ C P FAIL
fct_IDc fct_IDt Frate_IDc Frate_IDt VP Fct_LCFAIL Ec RPCT
P_c P_t     PCUTF     F_smooth
Kv              
Gi BETAi            

Definition

Field Contents SI Unit Example
mat_ID Material identifier.

(Integer)
ρ i Initial density.

(Real)

 [ kg m 3 ]
E Young’s modulus.

(Real)

 [ Pa ]
ν MathType@MTEF@5@5@+= feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbwvMCKf MBHbqefqvATv2CG4uz3bIuV1wyUbqedmvETj2BSbqefm0B1jxALjhi ov2DaebbnrfifHhDYfgasaacH8WjY=vipgYlh9vqqj=hEeeu0xXdbb a9frFj0=OqFfea0dXdd9vqai=hGuQ8kuc9pgc9q8qqaq=dir=f0=yq aiVgFr0xfr=xfr=xb9adbaGaaiGadiWaamaaceGaaqaacaqbaaGcba GaeqyVd4gaaa@3A61@ Poisson’s ratio.

Default=0 (Real)
C Cowper-Symonds strain rate coefficient.

(Real)

 [ Pa ]
P Cowper-Symonds strain rate exponent.

(Real)

 [ Pa ]
FAIL Plastic strain to failure.

(Real)

  
fct_IDc Curve identifier for compression yield stress.

(Integer)

  
fct_IDt Curve identifier for tension yield stress.

(Integer)
Frate_IDc Curve identifier defining the scaling coefficient for compression yield stress.

(Integer)

  
Frate_IDt Curve identifier defining the scaling coefficient for compression yield stress.

(Integer)
VP Strain rate formulation flag.
= 1 (Default)
Total strain rate.
= 2
Plastic strain rate.

(Integer)
Fct_LCFAIL Curve identifier defining plastic strain at failure as a function of strain rate.

(Integer)
Ec (Optional) Compression Young’s modulus.

(Real)

  
RPCT Scale factor used on P_c and P_t.

(Real)

  
P_c Limit pressure in compression.

(Real)

 [ Pa ]
P_t Limit pressure in tension.

(Real)

 [ Pa ]
PCUTF Pressure limit activation flag.
= 0
Not active
= 1
Active

No default (Integer)
F_smooth Exponential moving average strain rate filtering value (defined between 0 and 1).

(Real)

  
Kv Viscous bulk modulus.

(Real)

 [ Pa⋅s ]
Gi Shear relaxation modulus.

(Real)

 [ Pa ]
BETAi Shear decay constant.

(Real)

 [ 1 s ]

Comments

  1. This keyword maps to /MAT/LAW66, /VISC/PRONY and failure model (/FAIL).
  2. This material can be used for shell or solid elements.
  3. The option “_TITLE” can be added to the end of this keyword. When “_TITLE” is included, an extra 80 characters long line is added after the keyword input line which allows an entity title to be defined.