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The Application of Full-Field Techniques to Estimate both Tensile and Fracture Properties: an Investigation into Modifications to Standard Sample Geometries

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Abstract

This paper investigates modifications to the Brazilian disk and compact tension C(T) standard test geometries to allow full-field extraction of elastic tensile and toughness properties. A central notch has been introduced in the Brazilian disk to allow for the extraction of fracture properties, while the C(T) sample has been lengthened to allow for the extraction of tensile properties. Full-field displacements, measured on samples prepared from PMMA (Polymethyl methacrylate) using digital image correlation are analysed under the assumption of linear elasticity. First, the Virtual Fields Method is applied to estimate Young’s Modulus (E) and Poisson’s Ratio (v). These tensile properties are then used to determine estimates for the peak stress intensity factor (SIF) prior to fracture through a non-linear least squares field fitting approach. Test results show that a modified disk sample performed well in both analysis approaches with relative errors obtained as: 2.1% in E, 12.9% in v and 1% in SIF. A modified C(T) sample obtained relative errors of: 1.5% in E, 40.2% in v and 1% in SIF. Furthermore it is shown that field fitting approaches are less sensitive to error in v than error in E. The presented evidence aims to guide future experiments utilizing full-field techniques to study material properties in the framework of fracture mechanics, in particular in applications where limited material for obtaining tensile properties is available.

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Notes

  1. The code was adapted with permission by Matthew Molteno of Stellenbosch University for 2D and 3D DIC.

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Acknowledgements

The authors disclosed receipt of the following financial support for the research, authorship, and publication of this article: This work is based on the research supported in part by the National Research Foundation of South Africa for the grant, Unique Grant No. 87955 and 106932, and in part by the ESKOM Power Plant Engineering Institute (EPPEI) Material Science Specialisation programme.

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  1. Department of Mechanical and Mechatronic Engineering, Stellenbosch University, Private Bag X1, Matieland, 7602, South Africa

    Richard Lynn Huchzermeyer & Thorsten Hermann Becker

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  1. Richard Lynn Huchzermeyer
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  2. Thorsten Hermann Becker
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Correspondence to Thorsten Hermann Becker.

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Huchzermeyer, R.L., Becker, T.H. The Application of Full-Field Techniques to Estimate both Tensile and Fracture Properties: an Investigation into Modifications to Standard Sample Geometries. Exp Tech 42, 671–683 (2018). https://doi.org/10.1007/s40799-018-0267-9

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