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.
Highlights
Material characterization using contact mechanics-based testing, in particular normal indentation, most often relies on the classical analyses by Sneddon [1], Tabor [2], and Johnson [3,4] pertinent to standard elasto-plasticity
It has been shown previously that correlation can be achieved by using a combination of stresses at different levels of plastic strains to define representative quantities at scratching
These theoretical correlational relations were compared to experimental results for different material behavior pertinent to polymers, as well as metals
Summary
Material characterization using contact mechanics-based testing, in particular normal indentation (and scratch testing), most often relies on the classical analyses by Sneddon [1], Tabor [2], and Johnson [3,4] pertinent to standard elasto-plasticity. The outline of the theory below is—essentially—a repetition of the foundation laid down present investigation was instead to determine, by comparison with pertinent previous experimental previously by Larsson [23,24]. The following features constituted the basis (and notation) for the issue at hand: experimental results, the validity of the closed-form relations given by the theory.
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