The column is built up by gluing the two boards together. Determine the maximum normal stress on the cross section when the eccentric force of P = 50 kN is applied.
1. Introduction: Rough Surface in Contact I. Surface of Engineering Materials: Generals Surfaces have chemical properties, which are different from bulk virgin material. o Most metallic surfaces in air have oxide layers, which change the chemical and mechanical properties of the surfaces. Surfaces have mechanical properties, which are different from bulk material. o Machining or sliding contact makes strain hardened (or work hardened) layer and highly deformed layer, whose strength are different from bulk. Real engineering surfaces are rough. Mirror like smooth surface AFM image