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ezintegral

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For my Mechanical Engineering project, I'm working on a wind tower. One of the specifications we have to respect is a 50 years resistance to sunlight.

We've chosen inox steel as the primary material (after calculating the various constraints due to the wind the the rotor up on the tower, and determining the deflection of the neutral axis of the beam, etc)

The problem is that I have no idea how to determine whether a type of steel will resist to sunlight or not. The solar constant is 1.367 kJ/s on average, and 50 years is roughly 25 years of daylight and 25 years of night (a lot of approximations in there), so we calculated the total amount of energy that the tower will receive in 25 years.. it's a lot of energy, and I know a lot of it is dissipated (how?)

Anyway, that's why I'm here: Is there any way to determine how will a steel (or any other material) will resist to sunlight provided we know it thermal properties (transmittance, resistivity, etc..)?

Thank you