Recommended FEA yield criterion for 30% glass-filled LCP ?

[Bay_Area_Mech_Engr]

Hi Everyone,

Asking kind help from those who are experts in FEA modeling failure in plastics.

We are designing a part made from 30% glass-filled LCP. The part will distort under static load, and we're using FEA to identify how much part can distort before it fails
The application only involves one-time load, not cyclical load.

We understand their are a variety of yield criterion (such as Von Mises) but we are not sure which one best predicts the failure of 30% glass-filled LCP

Please kindly recommend a stress or strain criterion for using FEA to predict failure in part made from 30% glass-filled LCP

Thank you !

 

[btrueblood]

Tricky. Plastics, by definition, behave in plastic ways (more typically in viscoelastic ways), so the Von Mises criterion should be looked at somewhat askance.

see

https://www.eng-tips.com/viewthread.cfm?qid=440606