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Question: in an aluminium surface with a roughness depth after applying...

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In an aluminium surface with a roughness depth (after applying pressure) of 0.01 mm, the area of crests is 50% of the total area. The outer plate is in contact with stainless steel with roughness depth of 0.01 mm with the area of contact of 50%. Determine the contact resistance (i) If the inter space is filled with air (ii) If it is filled with oil of k = 0.15 W/mK.

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