Question: Two nominally flat steel surfaces are lapped to give standard deviation of surface heights of 0.15 um and correlation lengths of 1 m. When

Two nominally flat steel surfaces are lapped to give standard deviation of surface heights of 0.15 um and correlation lengths of 1 m. When the surfaces are placed in contact, (a) would you expect the asperity deformation to be elastic, predominately plastic, or elastic- plastic? (b) What is the real area of contact for a normal load of 100 N? Given parameters are composite modulus E* = 110 GPa and H = 8GPa.

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