Ice Screw Steel:

I’m not sure what material BD uses for its screws but I would assume it’s something like AISI 4130. This is heat treatable alloy steel that gives good hardness, strength and enough ductility that the steel will bend without cracking. However, knowing the exact alloy is not necessary because I have limited the loads to not exceed a working stress on the screw of 130,000 psi. This allows for a linear material model for the analysis and all steels have roughly the same Modulus of Elasticity of 29.5X10^6 psi.

Ice:

Ice properties vary from slushy to hard and brittle like glass. After quite a bit of searching on the web I found some testing data that was done by the U.S. Army Corps of Engineers specifically for Ice Engineering (Chap 6-2). All of the properties are proportional to strain rate, temperature, grain size, grain structure and porosity and vary greatly. For strain rates above 10^-3/ sec. ice will behave as a brittle material and the compressive strength will start to decrease. High strain rates above this limit will most likely occur in the ice directly under the screw by the mouth of the hole. To help simplify the simulations all Ice will be considered isotropic and ductile. Compressive strengths for fresh water ice are listed between 72.5 psi and 2900 psi. The Effective Modulus for ice is is listed between 2.9X10^5 psi at low frequency loading up to 1.3x10^6 psi at high frequency loading.