Abstract

The validity of material properties obtained from uniaxial tension tests using different specimen types and measurement techniques is investigated in this paper. Four different specimen geometries were tested, including round axisymmetric and rectangular flat samples of different sizes. This gave a significant variation in both size and shape of the specimens. The specimens were strained in tension to fracture, and different measurement techniques were applied to measure the deformation of the specimens during loading. This involved an extensometer, a laser micrometre, digital image correlation (DIC) and edge tracing. Cauchy stress versus logarithmic strain curves were obtained from the experimental data, and little spread was seen between the different test series. The data were further used to calibrate a work-hardening relation for the material, and it was found that the fitted curves differed mainly for strains beyond diffuse necking.

Highlights

  • The uniaxial tension test is by far the most used material test for providing information about the mechanical properties of metallic materials required for finite element simulations [1]

  • If digital image correlation (DIC) is combined with the finite element method (FEM), a powerful tool in obtaining optimized material properties based on rather simple material tests becomes available [3]

  • The measurement techniques used included a laser micrometre, 2D-DIC, edge tracing available in the DIC software and extensometers, depending on the specimen geometry

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Summary

Introduction

The uniaxial tension test is by far the most used material test for providing information about the mechanical properties of metallic materials required for finite element simulations [1]. The specimen is subjected to a linearly increasing displacement while simultaneously recording the applied force and the elongation of the gauge area Based on these measurements the engineering stress-strain curve until necking can be constructed, and this forms the basis for a direct calibration of material parameters. The main objective is to examine the validity of the material properties obtained using different measurement techniques and specimen types. The measurement techniques used included a laser micrometre, 2D-DIC, edge tracing available in the DIC software and extensometers, depending on the specimen geometry From these measurements, Cauchy (true) stress versus logarithmic strain curves were obtained ( after necking), providing a basis for a direct calibration of the work-hardening parameters. Acquiring experimental data after necking is important in order to have a good representation of the material response until fracture

Experimental Study
Experimental Results
Calibration of Work-Hardening Relation
Concluding Remarks
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