# MFront Orthrotropic behaviour

Hello everyone,

I’ve a problem with implementing new behaviour with MFront.

I want to try an orthotropic plastic behaviour, that I found here How to implement an orthotropic plastic behaviour with isotropic linear hardening in MFront (sourceforge.net) .
Whole Implementation: tfel.sourceforge.net/gallery/plasticity/OrthotropicLinearHardeningPlasticity.mfront

Here’s my input data:

**
** GEOMETRY
**
*Node
1, 0., 0., 1.
2, 0., 1., 1.
3, 0., 0., 0.
4, 0., 1., 0.
5, 1., 0., 1.
6, 1., 1., 1.
7, 1., 0., 0.
8, 1., 1., 0.
*Element, type=C3D8, elset=cube
1, 5, 6, 8, 7, 1, 2, 4, 3
*Solid Section, elset=cube, material=@CALCULIXBEHAVIOUR_OrthotropicLinearHardeningPlasticity, ORIENTATION=OR
*Nset, nset=sx2, generate
5, 8, 1
*Nset, nset=sx1, generate
1, 4, 1
*Nset, nset=sy1
1, 3, 5, 7
*Nset, nset=sy2
2, 4, 6, 8,
*Nset, nset=sz1
3, 4, 7, 8
*Nset, nset=sz2
1, 2, 5, 6,
**
** MATERIAL
**
*Material, name=@CALCULIXBEHAVIOUR_OrthotropicLinearHardeningPlasticity
*User Material, constants=17
7.8e+10,2.64233e+11,3.32e+11,
0.13,0.24,0.18,
4.8e+10,1.16418e+11,7.8e+10
0.371,0.629,4.052,1.5,1.5,1.5
150e6
150e9
*Depvar
17
**
*ORIENTATION,NAME=OR
0.,0.,0.,0.,0.,0.
**
*Step, nlgeom=YES
*Static
0.02, 1., 1e-05, 0.2
*Boundary
sx1, 1, 1
*Boundary
sy1, 2,2
*Boundary
sz1, 3,3
*Boundary
sx2, 1, 1, 0.2
*EL PRINT, ELSET=cube
E, S
*EL FILE
S
*NODE FILE
U
*End Step

Should I have to modify the MFront code, because there are already values? And is my input data correct? Especially with the depvar I’m very unsure.

CalculiX stops at the first iteration. What could I do?

Determining the structure of the matrix:
number of equations
8
number of nonzero lower triangular matrix elements
28

increment 1 attempt 1
increment size= 2.000000e-02
sum of previous increments=0.000000e+00
actual step time=2.000000e-02
actual total time=2.000000e-02

iteration 1

Using up to 1 cpu(s) for the stress calculation.

Using up to 1 cpu(s) for the symmetric stiffness/mass contributions.

Factoring the system of equations using the symmetric spooles solver
Using up to 1 cpu(s) for spooles.