Size-Effect Law for Scratch Tests of Axisymmetric Shape
Publication: Journal of Engineering Mechanics
Volume 142, Issue 12
Abstract
This paper presents a theoretical and experimental framework for the application of size-effect analysis to microscratch testing as a means to quantify the fracture properties and internal friction of materials at the microscale. The energetic size-effect law (SEL) for microscratch tests is developed for a general monomeric probe shape in terms of an intrinsic size function. The fundamental idea of the proposed approach is to rescale the scratch response to that of the flat punch, a conjecture that allows one to compare the SEL for different probe geometries, and thus solve for the asymptotic fracture toughness and effective process zone length from scratch tests done on homogenous (acetal homopolymer resin and polycarbonate resin) and inhomogeneous materials (mica ceramic and gas shale). As a material of current interest for controlled fracture studies, two samples of gas shale cored from the Marcellus and Eagle Ford formations are tested and analyzed to quantify all material properties that may be derived from the scratch resistance; namely fracture parameters, asymptotic hardness, strength, cohesion, and internal friction.
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Acknowledgments
The authors acknowledge the support of this study through the Massachusetts Institute of Technology X-Shale project sponsored by Shell and Schlumberger, and enabled through MIT’s Energy Initiative. Additional thanks go to Ange-Therese Akono and Christian Hoover for valuable discussions, and Konrad Krakowiak for providing microscratch data on fused silica for the analysis.
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Published In
Journal of Engineering Mechanics
Volume 142 • Issue 12 • December 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Mar 10, 2016
Accepted: Jun 29, 2016
Published online: Aug 9, 2016
Published in print: Dec 1, 2016
Discussion open until: Jan 9, 2017
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