The Necessary Condition for a Hard Coating to Strengthen a Coated Sphere

Author:

Chen Z.123

Affiliation:

1. State Key Laboratory of Fluid Power and Mechatronic Systems, Zhejiang University, Hangzhou 310027, China;

2. School of Mechanical Engineering, Zhejiang University, Hangzhou 310027, China;

3. Department of Mechanical Engineering, Technion, Haifa 32000, Israel

Abstract

Abstract The yield resistance of a coated sphere subjected to normal contact loading is studied based on a finite element analysis. Moderately hard coatings that were omitted in previous literature are considered. A maximum weakening/strengthening effect of minimizing/maximizing the yield resistance is observed to be linked to the transition of yield inception location. The necessary condition for a hard coating to strengthen a coated sphere is proposed. Only hard coatings with yield strength ratio above a threshold value can provide a constructive strengthening effect.

Publisher

ASME International

Subject

Surfaces, Coatings and Films,Surfaces and Interfaces,Mechanical Engineering,Mechanics of Materials

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