Abstract

The aim of this paper is to assess and compare the performance of both high speed 2D and 3D digital image correlation (DIC) configurations in the characterization of unidirectional carbon fiber reinforced epoxy composites in high strain rate tension in the transverse direction. The criteria for assessment were in terms of strain resolution and measuring the strain localization within the gauge section. Results showed the high-speed 3D DIC technique has lower strain resolution compared to the high-speed 2D DIC technique. In addition, the analysis of the full strain fields indicated that the 3D DIC technique could accurately locate and measure the concentrations of strains within the gauge section of the tested samples.

Highlights

  • Composite materials are increasingly being used in impact critical aeronautical and automotive applications

  • The split Hopkinson bar technique has been most suited for characterization of such materials at high strain rates, where strain rates can reach up to

  • The material used in this study was unidirectional carbon fiber reinforced epoxy composite in the transverse direction (90° fiber orientation)

Read more

Summary

Introduction

Composite materials are increasingly being used in impact critical aeronautical and automotive applications. It is, important to study the behavior of these materials at high strain rates for design and material modelling purposes alike. Typical engineering stress strain curves can be determined from split Hopkinson bar tests by application of the one-dimensional wave propagation theory [2]. Due to the very low levels of strains for certain composite materials, accurate measurement of the specimen’s strain from the 1 dimensional elastic wave equations is usually difficult to achieve. It is known that the classical Hopkinson equations usually overestimate the strains of the samples in high strain rate tensile tests [3,4]. Local strain measurement on the sample is necessary during split

Objectives
Methods
Results
Conclusion
Full Text
Published version (Free)

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call