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Crystals 2019, 9(3), 154; https://doi.org/10.3390/cryst9030154

Representative Stress Correlation of Global Scratch Quantities at Scratch Testing: Experimental Verification

Department of Solid Mechanics, Royal Institute of Technology, SE-10044 Stockholm, Sweden
Received: 28 February 2019 / Revised: 11 March 2019 / Accepted: 12 March 2019 / Published: 14 March 2019
(This article belongs to the Section Crystalline Materials)
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Abstract

Evaluation and correlation of global quantities, i.e., normal and tangential hardness, at scratch testing in the context of a representative stress description was investigated. In particular, verification based on experimental results is at issue. It has been shown previously that within the framework of classical von Mises elasto-plasticity and quasi-static conditions, correlation can be achieved by using a combination of stresses at different levels of plastic strains to define representative quantities at scratching, accounting for the difference in mechanical behavior at elasto-plastic and rigid plastic scratching. However, verification from experimental results is required, which has been attempted in this study. Predictions based on previous theoretical results were compared with experimental findings for polymeric materials, as well as for different metals. Good agreement was found between the two sets of results, particularly so for the case of polymers modelled by von Mises elasto-plasticity. Accordingly, these results are of direct practical, accurate, and novel relevance for semi-crystalline polymers where viscoelastic effects are negligible. View Full-Text
Keywords: scratch testing; contact behavior of global properties; normal hardness; tangential hardness; polymeric materials; metals scratch testing; contact behavior of global properties; normal hardness; tangential hardness; polymeric materials; metals
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Larsson, P.-L. Representative Stress Correlation of Global Scratch Quantities at Scratch Testing: Experimental Verification. Crystals 2019, 9, 154.

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