/MAT/LAW49 (STEINB)

Block Format Keyword

/MAT/LAW49 - Steinberg-Guinan Material

Description

This law defines an elastic plastic material with thermal softening.

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
/MAT/LAW49/mat_ID/unit_ID or /MAT/STEINB/mat_ID/unit_ID
mat_title

E0
		b		n
T0		Tm				Pmin
b1		b2		h		f

Field	Contents	SI Unit Example
mat_ID	Material identifier (Integer, maximum 10 digits)
unit_ID	Optional unit identifier (Integer, maximum 10 digits)
mat_title	Material title (Character, maximum 100 characters)
	Initial density (Real)
	Reference density used in E.O.S (equation of state) Default = (Real)
E0	Initial Young’s modulus (Real)
	Poisson’s ratio (Real)
	Plasticity initial yield stress Default = none (Real)
b	Plasticity hardening parameter Default = none (Real)
n	Plasticity hardening exponent Default = none (Real)
	Maximum plastic strain Default = 1030 (Real)
	Plasticity maximum stress Default = 1030 (Real)
T0	Initial temperature Default = 300 (Real)
Tm	Melting temperature (Real)
	Specific heat (Real)
Pmin	Pressure cutoff Default = 0.0 (Real)
b1	Law coefficient Default = none (Real)
b2	Law coefficient Default = none (Real)
h	Law coefficient Default = none (Real)
f	Law coefficient Default = none (Real)

#RADIOSS STARTER

#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|

/UNIT/1

unit for mat

g cm mus

#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|

#- 2. MATERIALS:

#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|

/MAT/LAW49/1/1

Aluminum

# RHO_I RHO_0

2.73 0

# E0 nu

.734 .33

# sigma_0 beta n EPS_max SIGMA_max

.0029 125 .1 9 .0068

# T_0 Tmelt rhoC_p Pmin

300 1220 2.59E-5 -.005

# b1 b2 h f

6.5 6.5 6.2E-4 0

/EOS/GRUNEISEN/1/1

Aluminum

# C S1 S2 S3

.524 1.5 0 0

# GAMMA0 ALPHA E0 RHO_0

1.97 0 0 0

#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|

#ENDDATA

/END

#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|

1.	When material approaches melting point, the yield strength and shear modulus diminish to zero. Melting energy is defined as:

Where, Ec is the cold compression energy and Tm is the melting temperature supposed to be constant.

If the internal energy E is less than Em, the shear modulus and the yield strength are defined as follows:

With

where, is given by a hardening rule:

If , then

The value of is limited by:

2.	If an Equation of State (/EOS) does not refer to this material, the pressure is computed as:

with

3.	When reaches , in one integration point, the deviatoric stress of the corresponding integral point is permanently set to 0, however, the solid element is not deleted.