Material Parameters

UCSDSAND3 and UCSDCLAY have been integrated into LS-DYNA as user defined material models with a material ID of 050 and 047 respectively. The material parameters should be inputted as detailed below.

Note: To apply gravity, make use of Grav_Time (in seconds) to define the length of the gravity analysis. The desired Young's Modulus (E_Grav), poison's ratio (PR_Grav), shear modulus (G_Grav) and bulk modulus (K_Grav) to use during the gravity analysis should be provided as the last 5 parameters as shown below. The Young's and poison's ratio are used as input for the soil model, while the shear and bulk are for LS-DYNA. The values for mid, lmc, ibulk, and ig are provided in the corresponding sections.

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*UCSDSAND3 *MAT_050

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UCSDSAND3 is implemented as Material Type 50 (*MAT_USER_DEFINED_MATERIAL_MODELS). The material parameters input should be formatted as shown below. The definition of the variables can be found here.

Card 1	1	2	3	4	5	6	7	8
Variable	mid	ro	mt	lmc	nhv	iortho	ibulk	ig
Type	I	F	I	I	I	I	I	I

Card 2	1	2	3	4	5	6	7	8
Variable	ivect	ifail	itherm	ihyper	ieos	lmc	unused	unused
I	I	I	I	I	I	I

Card 3	1	2	3	4	5	6	7	8
Variable	refShear	refBulk	frictionA	peakStr	refPress	presDepCo	PTAng	mType
Type	F	F	F	F	F	F	F	I

Card 4	1	2	3	4	5	6	7	8
Variable	ca	cb	cc	cd	ce	da	db	dc
Type	F	F	F	F	F	F	F	F

Card 5	1	2	3	4	5	6	7	8
Variable	noYieldSu	liquefac1	liquefac2	pAtm	cohesi	Grav_Time	E_Grav	PR_Grav
Type	I	F	F	F	F	F	F	F

Card 6	1	2	3	4	5	6	7	8
Variable	G_Grav	K_Grav	unused	unused	unused	unused	unused	unused
Type	F	F

VARIABLES	INPUT
mid	50.
lmc	26.
ibulk	26.
ig	25.

Input example:
*MAT_USER_DEFINED_MATERIAL_MODELS $# mid ro mt lmc nhv iortho ibulk ig 4 1.9900E+0 50 26 0 0 26 25 $# ivect ifail itherm ihyper ieos lmca unused unused 0 0 0 0 0 0 $#refShear refBulk frictionA peakStr refPress presDepCo PTAng mType 7.3700E+4 1.9680E+5 3.0300E+1 1.0000E-1 1.0100E+2 5.0000E-1 3.0400E+1 0 $# contra1 contra2 contra3 contra4 contra5 dilat1 dilat2 dilat3 0.012 3.0 0.4 9.0 0.0 0.3 3.0 -0.3 $# NYS liquefac1 liquefac2 pAtm cohesi Grav_Time E_Grav PR_grav 20 1 0 1.0100E+2 1.7300E+0 1.0000E+0 2.1963E+5 4.9000E-1 $# G_grav K_grav 7.3700E+4 3.6600E+6

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*UCSDCLAY *MAT_047

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UCSDCLAY is implemented as Material Type 47 (*MAT_USER_DEFINED_MATERIAL_MODELS). The material parameters input should be formatted as shown below. The definition of the variables can be found here.

Card 1	1	2	3	4	5	6	7	8
Variable	mid	ro	mt	lmc	nhv	iortho	ibulk	ig
Type	I	F	I	I	I	I	I	I

Card 2	1	2	3	4	5	6	7	8
Variable	ivect	ifail	itherm	ihyper	ieos	lmc	unused	unused
I	I	I	I	I	I	I

Card 3	1	2	3	4	5	6	7	8
Variable	shearMod	poisRatio	shearStrg	peakStr	noYieldSu	Grav_Time	E_Grav	PR_Grav
F	F	F	F	F	F	F	F	F

Card 4	1	2	3	4	5	6	7	8
Variable	G_Grav	K_Grav	unused	unused	unused	unused	unused	unused
Type	F	F

VARIABLES	INPUT
mid	47.
lmc	10.
ibulk	10.
ig	9.

Input example:
*MAT_USER_DEFINED_MATERIAL_MODELS $# mid ro mt lmc nhv iortho ibulk ig 9 1.5000E+0 47 10 0 0 10 9 $# ivect ifail itherm ihyper ieos lmca unused unused 0 0 0 0 0 0 $#shearMod poisRatio shearStrg peakStr noYieldSu Grav_Time E_grav PR_grav 6.0000E+4 4.0625E-1 3.7000E+1 1.0000E-1 20 1.0000E+0 1.7880E+5 4.9000E-1 $# G_Grav K_grav 6.0000E+4 2.9797E+6