Learning Forum

[koupelidis.c]

While researching core materials with the aim of defining a custom Aramid Nomex Honeycomb Core to use for my analysis, I encountered a problem.

 

In my understanding the program defines the material based on a coordinate system. So as I was adding the properties of the material I decided that the z direction was going to be the "strong" one. But when I imported the model in the ACP system, and opened it using SpaceClaim, it had the coordinate system of the CAD program I was using and the model wasn't oriented the way I wanted it to be.

 

 

My question is, should I define 3 identical materials but the "strong" direction be different it's time for the three axis and use them accordingly or I'm misunderstanding how adding custom materials work.

[Govindan Nagappan]

Are you defining orthotropic material?

Orthotropic material data requires nine values to be fully described, namely three Young’s moduli (Ex, Ey, Ez), three Poisson’s ratios (vxy, vyz, vxz), and three shear moduli (Gxy, Gyz, Gxz). Usually X is considered fiber direction, Y is transverse direction and Z is the thickness/orientation direction. 

Usually EX greater than or equal to EY

EY should be greater than or equal to EZ

By default all elements use the Global X, Y and Z directions for the element coordinate system.

You can change this and define "element orientation" for selected bodies in the Geometry tree in mechanical. Or you can build the composite in ACP Pre where you can assign the materials ans define the element orientation. If this is not what you are looking for, please provide more details about the material and the process you are using