Modeling and analysis of ductility of brittle materials using indentation method

Guoyan Sun; Zhe Lu; Jianming Bai; Fangsu Yu

doi:10.1117/12.2069591

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6 August 2014 Modeling and analysis of ductility of brittle materials using indentation method

Guoyan Sun; Zhe Lu; Jianming Bai; Fangsu Yu

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Proceedings Volume 9281, 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies; 928122 (2014) https://doi.org/10.1117/12.2069591
Event: 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT 2014), 2014, Harbin, China

Abstract

Nowadays, many optical elements are fabricated by means of glass molding using hard and brittle inserts such as Silicon Carbide (SiC) and Silicon Nitride (Si₃N₄). However, for those hard-to-machine materials, the most feasible solution is still with ultra-precision grinding and following polishing. Hence, it is necessary and meaningful to study their plastic properties for the development of optical fabrication and ultra-precision manufacturing process. However, the conventional methods including compression test and indentation fracture mechanics are not sufficient to obtain the accurate parameters and still lack of reliable supporting of the machining process. To solve this problem, this paper presents a novel way to correlate the plastic properties to the indentation data using dimensional analysis for the two sorts of hard and brittle materials of SiC and Si₃N₄. Through integrating the data obtained by the indentation tests and the modeling method presented in this paper, stress-strain behavior, yield stress σ_y, yield strain epsilon_y and strain hardening exponent n could be determined. The processing performance of these two materials reflected by the above parameters are consistent with the conclusions drawing from the indentation crack development under varying loads during the indentation test, which verifies the effectiveness and feasibility of the presented modeling method.

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Guoyan Sun, Zhe Lu, Jianming Bai, and Fangsu Yu "Modeling and analysis of ductility of brittle materials using indentation method", Proc. SPIE 9281, 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies, 928122 (6 August 2014); https://doi.org/10.1117/12.2069591

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