Small-strain Option for PH Model
![](https://itasca-int.objects.frb.io/assets/img/site/news/featured_news_happening_flac3d_phssmodel01.png)
Experiments show that soil stiffness modulus is strain-dependent – decreasing nonlinearly with increase in shear strain. To take soil strain dependency into account, a PH small-strain (PHSS) stiffness modulus formulation is now available with the Plastic Hardening model.
This is a free update to the PH Model now available in FLAC3D 6.