HyperSizer Support Forum

Engineering & Analysis Methods => Miscellaneous Analysis & Methods => Topic started by: SD_Gabe on February 06, 2012, 01:12:12 PM

Title: Flatwise Tension with solid elements
Post by: SD_Gabe on February 06, 2012, 01:12:12 PM

I have a question with the way HyperSizer is calculating sigma-rr in the FWT calcs. It looks as though it is generating a Moment from the model (not from the facesheets) and using that to calculate the FWT. How is that moment calculated when using 3D solid elements?

Thanks.

Title: Re: Flatwise Tension with solid elements
Post by: SD_Gabe on February 07, 2012, 11:36:51 AM

As we looked closer at the analysis it looks like HyperSizer is using the stress in the 'Z' direction directly for the sigma-rr term. However, it seems to be using negative stresses for FWT calcs. I believe that is telling me it is using a compressive stress for a tension calc. Is it supposed to do that?

Title: Re: Flatwise Tension with solid elements
Post by: James on February 07, 2012, 07:04:46 PM

The (Sig_rr) normal stress  is computed for a solid element by averaging the Normal_Z stresses at each grid.

Sig_rr = Sig_Z Average (G1:G8)

This stress is passed directly into the Flatwise Tension analysis, the panel bending moments are not used to determine the Sig_rr. If the average stress is compressive, the Flatwise tension analysis should be disabled.

If you have a case that is behaving otherwise, could you please send me the example.