MechEngr1997
Mechanical
- Aug 20, 2012
- 2
As I understand it, FR-4 is considered to be an orthotropic material. I want to do a static structural FEA in ANSYS Workbench on a part to be made of FR-4. However, I am having trouble finding all of the material properties I need. The Wikipedia page on FR-4 seems to give the most information that I've been able to find anywhere ( However, the material properties template in ANSYS Workbench appears to need more.
In the past, when doing FEAs on parts to be made of FR-4, I've really been primarily interested in whether the part is strong enough; so I didn't hassle so much over finding all the material properties. Below yield, stress is only dependent on the forces applied and the physical geometry of the part. I would just compare the maximum principal stresses to the strength numbers I was able to find for FR-4.
Now, I'm a bit more interested in deformation of the part I'm designing. Knowing Young's modulus (YM) and poisson's ratio (PR) in 3 perpendicular directions seems like it's become more important. Wikipedia gives YM and PR in the lengthwise (warp yarn) and crosswise (fill yarn) directions - but not in the through-plane direction.
What are people out there typically doing to model FR-4 in an FEA? What's the most accepted practice in this situation?
Am I overlooking something? - Is there a way to extract the properties that are missing from the ones that are given?
In the past, when doing FEAs on parts to be made of FR-4, I've really been primarily interested in whether the part is strong enough; so I didn't hassle so much over finding all the material properties. Below yield, stress is only dependent on the forces applied and the physical geometry of the part. I would just compare the maximum principal stresses to the strength numbers I was able to find for FR-4.
Now, I'm a bit more interested in deformation of the part I'm designing. Knowing Young's modulus (YM) and poisson's ratio (PR) in 3 perpendicular directions seems like it's become more important. Wikipedia gives YM and PR in the lengthwise (warp yarn) and crosswise (fill yarn) directions - but not in the through-plane direction.
What are people out there typically doing to model FR-4 in an FEA? What's the most accepted practice in this situation?
Am I overlooking something? - Is there a way to extract the properties that are missing from the ones that are given?