Anisotropic material

Tsega

Anisotropy is the property of being directionally dependent, as opposed to isotropy, which means homogeneity in all directions. It can be defined as a difference in the physical property of a certain material when measured along different axes. Most structural materials are anisotropic, which means that their material properties vary with orientation. 

I want to assign a material property so that it addresses this anisotropic behavior. Which card image is for anisotropic material, and how can I determine which direction is which while analyzing the simulation results?

Adriano_Koga

Are you working with OptiStruct?

From the 'User Guide' in OptStruct, topic 'Materials'.

Basically you can use MAT9 or MAT9ORT, combined with solid mesh and PSOLID property (where you assign a local system for orientation).

 

The MAT9 Bulk Data Entry can be used to define the properties for anisotropic elastic materials for three dimensional solid elements. The general an-isotropic stress-strain relationship linking the six independent stress components of the stress tensor at a point and the six independent strain components of the tensor at the point contain 21 independent constants in the elasticity matrix. These values are supplied using the MAT9 Bulk Data card. The MAT9 Bulk Data card is used with the CHEXA, CPENTA, CPYRA, and CTETRA solid elements, and can only be referenced on the PSOLID property card. The optional coordinate system in which MAT9 data are specified is supplied via the PSOLID Bulk Data Entry.

 

Tsega

I'm working with radioss incremental and it is shell property (the model is not solid).

And also, even if we assign the properties as intended, how can we determine which direction is which while analyzing the simulation results?

Thanks in advance!

Adriano_Koga

Tsega said:

I'm working with radioss incremental and it is shell property (the model is not solid).

And also, even if we assign the properties as intended, how can we determine which direction is which while analyzing the simulation results?

Thanks in advance!

i'm not an expert in Radioss, but if i'm not mistaken you have a few properties for shell composites SH_COMP and SH_SANDW, and you assign a orthotropic material to the layers.

 

In the property you will assign also a local coordinate system that defines the reference ("zero degree") direction. All layers will be related to this one.

 

Please take a look at Radioss documentation for /PROP/TYPE10 and /PROP/TYPE11.

for material /MAT/COMPSH for orthotropic material.

Tsega

Adriano A. Koga_21884 said:

i'm not an expert in Radioss, but if i'm not mistaken you have a few properties for shell composites SH_COMP and SH_SANDW, and you assign a orthotropic material to the layers.

 

In the property you will assign also a local coordinate system that defines the reference ("zero degree") direction. All layers will be related to this one.

 

Please take a look at Radioss documentation for /PROP/TYPE10 and /PROP/TYPE11.

for material /MAT/COMPSH for orthotropic material.

Thank you very much!