Computational meaning of '0 Pa' Compressive Strength

[aetherTap]

Hello Everyone,

I searched for the answer here but only found one thread (in which there were no replies). This may be a beginner's question, but what purpose does ANSYS have for giving a material like Titanium a non-existent Compressive Strength?

I could understand that for a string member, but obviously a zero strength Titanium member is unrealistic. Why does ANSYS Workbench list materials like this?

Thanks