Material Distribution inside an object

[Anthony Garland]

Hi,

After reading a lot of posts in this group and web pages I'm still confused about whether or the AMF format can describe material distributions inside of an object. For example, I want to have a alloy material that changes the alloy composition as a function of its position.
If I have alloy where all the material fractions add up to one, and one of the materials composition varies by this function,
z = (x^2+y^2)/(max_z_value)
Can AMF represent this type of material gradients inside the part?

Thanks,

Anthony G.

[Hod Lipson]

Yes, AMF can specify a graded material distribution like you describe.
Did you get a chance to look at the format itself, or the Wikipedia page? It has some examples.

I can also send you the current draft for review.

--hod

--
You received this message because you are subscribed to the Google Groups "STL 2.0" group.
To unsubscribe from this group and stop receiving emails from it, send an email to stl2+uns...@googlegroups.com.
To post to this group, send email to st...@googlegroups.com.
Visit this group at http://groups.google.com/group/stl2.
For more options, visit https://groups.google.com/groups/opt_out.

[Anthony Garland]

I looked at the wikipedia page, but I'm having a hard time understanding the link between objects and materials. Also I'm trying to see how to represent a a piecewise function that defines the material distributions within one object. Like

if(z<4)

  <composite materialid="1">(z^2)/16</composite>

if(z>4)

 <composite materialid="1">1-(4-z)*0.1</composite>


I guess it would work. 
I've only looked at the Wikipedia page. Can you send me the current draft?

[Hod Lipson]

 

Briefly, you can define a object composed of multiple volumes, and each volumes can be assigned a material.

The material can be defined as a graded composite of two base materials.

 

If you want a piecewise distribution of materials, you can do it in two ways. Either

1.      Define two volumes, and assign a different material function to each volume, or

2.      Use a discontinuous blending function. Discontinuous functions can be created using discontinuous functions such as logical functions, step functions, mod functions, etc.

 

Hope this helps

--hod

 

 

Hod Lipson

Associate Prof. of Mechanical & Aerospace Engineering and Computing & Information Science

Cornell University, 242 Upson Hall, Ithaca NY 14853, USA

Office: (607) 255 1686 Lab: (607) 254 8940 Fax: (607) 255 1222

Email: Hod.L...@cornell.edu

Web: http://www.mae.cornell.edu/lipson

Administrative Assistant:  Craig Ryan  cd...@cornell.edu

Calendar: http://www.mae.cornell.edu/lipson/calendar.htm