Proceedings ArticleDOI
Design and analysis of indentation tester with nanometer accuracy
Song Zhongkang,Ma Dejun,Chen Wei,Guo Junhong +3 more
- pp 3106-3109
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TLDR
Based on the instrumented indentation technique, an indentation tester with nanometer accuracy, which integrate the functions of driving, measuring, controlling and data-analyzing together, is presented in this paper.Abstract:
Based on the instrumented indentation technique, an indentation tester with nanometer accuracy, which integrate the functions of driving, measuring, controlling and data-analyzing together, is presented in this paper. The test's intermediate error is decreased by loading with voice coil actuator without transmission mechanism. And the signal is acquired from high-precision capacitive displacement sensor and strain gauge load cell. An closed loop control system based on PID algorithm is developed and control software is programmed. By analyzing the displacement influence factors, calibrating the instrument compliance and confirming the initial contact point, the accuracy of the testing result is guaranteed sufficiently.read more
References
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Journal ArticleDOI
An improved technique for determining hardness and elastic modulus using load and displacement sensing indentation experiments
Warren C. Oliver,George M. Pharr +1 more
TL;DR: In this paper, the authors used a Berkovich indenter to determine hardness and elastic modulus from indentation load-displacement data, and showed that the curve of the curve is not linear, even in the initial stages of the unloading process.
Journal ArticleDOI
Measurement of hardness and elastic modulus by instrumented indentation: Advances in understanding and refinements to methodology
Warren C. Oliver,George M. Pharr +1 more
TL;DR: In this article, the authors review the current understanding of the mechanics governing elastic-plastic indentation as they pertain to load and depth-sensing indentation testing of monolithic materials and provide an update of how they now implement the method to make the most accurate mechanical property measurements.
Journal ArticleDOI
Indentation size effects in crystalline materials: A law for strain gradient plasticity
William D. Nix,Huajian Gao +1 more
TL;DR: In this article, the indentation size effect for crystalline materials can be accurately modeled using the concept of geometrically necessary dislocations, which leads to the following characteristic form for the depth dependence of the hardness: H H 0 1+ h ∗ h where H is the hardness for a given depth of indentation, h, H 0 is a characteristic length that depends on the shape of the indenter, the shear modulus and H 0.
Journal ArticleDOI
Indentation size effect in metallic materials: Correcting for the size of the plastic zone
TL;DR: In this article, a correction method for the Nix/Gao model of the indentation size effect is proposed, assuming that the geometrically necessary dislocations are stored within the plastically deformed volume, whose radius is given, depending on the material, by a factor times the contact radius.
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