Add Multi-Material Properties

[dmrdjenovich]

From Introduction to Materials Science Class:

• Hume Rothery Miscibility Rules
• Pilling-Bedworth Ratios (protective oxide prediction)
• Nordheim's Rule (resistivity as a function of dilute impurity concentration in metals)
• Reynolds / Hugh Rule (resistivity as a function of concentration in a sub-eutectoid dual-phase field)

Other Ideas:

• Lattice Misfit
• Surface Tension at Dissimilar Material Interface?
• Brewester's Angle (optics)
• Angle of Total Internal Reflection

[montoyjh]

Just an update, we have a very good start to this with @dmrdjenovich's recent addition of the pilling bedworth ratio. The main issue is we've simplified base graph evaluation considerably by using only single material properties, and multi-material properties requires data aggregation to determine valid inputs in a way that single material graph evaluation does not. Currently the thinking is that we attach the aggregation methods to composite models to the models themselves, which I think is tenable, but there's still a bit more work to be done to make these more facile and easy to implement.