An elastic-plastic indentation model for different geometric indenters and its applications. (December 2020)

• Record Type: Journal Article
• Authors: Chen, Hui; Cai, Li-xun; Li, Chuanxi
• Is Part Of: Materials today communications. Volume 25(2020)
• Publication Date: 2020-12
• Subjects: Indentation -- Load-depth relation -- Equivalent energy method -- Stress-strain relation -- Hardness; Materials science -- Periodicals; 620.11
• DOI: 10.1016/j.mtcomm.2020.101440
• Languages: English
• ISSNs: 2352-4928

Abstract

Graphical abstract: Highlights: An elastic-plastic indentation model about load, depth and materials properties for various indenters is proposed. For both elastic and elastic-plastic stage, the model predictions agree well with the theoretical solutions and FEA results. The novel model can be used to obtain the stress-strain curves and convert the hardness of metallic materials. Abstract: Based on equivalent energy method, an elastic-plastic indentation model (EIM) to describe the elastic and the elastic-plastic load-depth relations is developed for conical, spherical, cylindrical and Vickers penetration. The model contains a few parameters related to the volume of deformed region and the equivalent strain at mean value point for energy integral. Once and five times FEA (finite element analysis) calculations are respectively conducted to calibrate these parameters for elastic and elastic-plastic indentation. For the indentations with different geometric indenters, the model predicted load-depth curves coincide with those of the existing theoretical or numerical solutions and FEA simulations. Moreover, conical and spherical indentation testing data from our experiments and the others are adopted to acquire stress-strain relations of materials and the indentation results are still consistent with tensile stress-strain curves. A hardness conversion is conducted for nickel alloys based on the EIM, which is close to the discrete data from the ASTM standard.