Nano Scratch Testing of Composite Materials

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  • Topic: Finite element method, Finite element method in structural mechanics, Materials science
  • Pages : 23 (7247 words )
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  • Published : April 10, 2013
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Faculty of Science and Engineering
Department of Mechanical, Aeronautical and Biomedical Engineering

Nano-scratch testing of Composite Materials

Author
Mohamed Gouse

Interim Report (inc. Literature review), submitted as part of the M.Eng. in Aeronautical Engineering

It is hereby declared that this report is entirely my own work, unless otherwise stated, and that all sources of information have been properly acknowledged and referenced. It is also declared that this report has not previously been submitted, in whole or in part, as part fulfillment of any module assessment requirement.

Signed: Date:
Abstract

Composites have been very successful in displacing the traditional materials due to their high level of specific properties, namely strength and stiffness. In recent years, a large amount of research has led to the emergence of advanced multi-scale predictive capabilities, potentially providing composite material and structural designers with enhanced knowledge and understanding the behavior of the material system that could help to reduce the time between research phase and the industry-based implementations. Nano indentataion and nanoscratch tests are most widely used techniques for the study of micromechanical properties of the Composite material on the surfaces. In this regard, FEM has been more successful in design and analysis of the Composite materials in the recent years. Many FEM models have been studied which gives approximation method to calculate the micromechanical properties of the composites and its interphase properties. FEM has been very useful in developing a composite model which can analyzed micromechanical properties in assistance with nano-indentation and nano-scratch technique and can be served for the correlation of experimental results with the numerical approximation values. In this study a finite element modeling assisted nanoscratch measurement system will be developed and applied for quantitatively evaluating the micromechanical properties of the composite material. The evaluation is based on the nanoscratch test with the aid of nanoindentor and the optimal process will be simulated by finite element method. Both 2D and 3D finite element model of the composite material to incorporate the microscopic nanoscratch mechanism will be developed. This development will be validated with the nanoindentor test and numerical, experimental and analytical results will be compared. Keywords: Nanoindentation, Nanoscratch test, Elastic-Plastic properties, Finite Element Method.

Contents

Abstract2
Contents3
List of Figure5
1. Introduction:6
2. Theory7
2.1 Nano-indentation theory7
2.2 Nano-Scratch Test9
2.3 Finite Element Method (FEM)10
2.3.1Discretisation of the structure11
2.3.2Selection of a proper interpolation or displacement model11
2.3.3Derivation of element stiffness matrices and load vectors11
2.3.4Assemblage of element equations11
2.3.5Solution for the unknown nodal displacements12
2.3.6Computation of element strains and stresses12
Progress till date12
3. Literature Review12
3.1 The effect of fibre constraint in the nanoindentation of fibrous composite microstructures: A finite element investigation12
3.2 Micromechanical stress analysis of closely packed fibrous composites14
3.3 Application of nano-indentation, nano-scratch and single fibre tests in investigation of interphases in composite materials15
3.4 Nano-indentation of polymer-glass interfaces Part I. Experimental and mechanical analysis16
3.5 COMM Toolbox: A MATLAB toolbox for micromechanical analysis of composite materials17
4. Objective18
4.1 Statement of Problem18
4.2 Solution Approach18
Progress to Work19
5. Finite Element Modeling19
5.1 Nanoindentation modeling19
5.2 FEA result of the nanoindentation modelling20
5.2 Nanoscratch modeling20...
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