/MAT/LAW32 (HILL)

Block Format Keyword

/MAT/LAW32 - Hill Orthotropic Plastic Material

Description

This law describes the Hill orthotropic plastic material. It is applicable only to shell elements. This law differs from LAW43 (HILL_TAB) only in the input of yield stress.

Format

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
/MAT/LAW32/mat_ID/unit_ID or /MAT/HILL/mat_ID/unit_ID
mat_title

E
a				n
		m
r00		r45		r90				Iyield0

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)
E	Young’s modulus (Real)
	Poisson’s ratio (Real)
a	Yield parameter (Real)
	Hardening parameter (Real)
n	Hardening exponent (Real)
	Failure plastic strain Default = 1030 (Real)
	Maximum stress Default = 1030 (Real)
	Minimum strain rate Default = 1.0 (Real)
m	Strain rate exponent Default = 0.0 (Real)
r00	Lankford parameter 0 degree (Comment 5) Default = 1.0 (Real)
r45	Lankford parameter 45 degrees Default = 1.0 (Real)
r90	Lankford parameter 90 degrees Default = 1.0 (Real)
Iyield0	Yield stress flag (Integer) = 0: average yield stress input = 1: yield stress in orthotropic direction 1

#RADIOSS STARTER

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

/UNIT/1

unit for mat

kg mm ms

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

#- 2. MATERIALS:

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

/MAT/HILL/1/1

void_steel

# RHO_I

7.8E-7

# E NU

210 .3

# A EPSILON_0 n EPS_max SIGMA_max

.17 .2 .45 0 0

# EPS_DOT_0 m

0 0

# r00 r45 r90 Iyield0

.75 1 1.25 0

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

#ENDDATA

/END

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

1.	The yield stress is defined as follows:

The elastic limit is given by:

Where, is the plastic strain and is the strain rate.

2.	The yield stress is compared to the equivalent stress:

mat_law32_yield_stress

3.	This material law must be used with property set type /PROP/TYPE10 (SH_COMP) or /PROP/TYPE9 (SH_ORTH).

4.	Iterative projection (Iplas =1) and radial return (Iplas =2) for shell plane stress plasticity are available.

5.	Angles for Lankford parameters are defined with respect to orthotropic direction 1.

The Lankford parameters rα is the ratio of plastic strain in plane and plastic strain in thickness direction .

Where, α is the angle to the orthotropic direction 1.

This Lankford parameters rα could be determined from a simple tensile test at an angle α.

A higher value of R means better formability.

6.	If the yield stresses have been obtained in the orthotropic direction 1, define Iyield0 =1; otherwise Iyield0 =0.

7.	When reaches the value of , in one integration point, then the corresponding shell element is deleted.

/MAT/LAW32 (HILL)

/MAT/LAW32 (HILL)

/MAT/LAW32 (HILL)

Format

See Also: