Novel Photomechanics Approaches to Determine the Intra- and Inter-laminar Properties of Composites at High Rates of Strain
Abstract
This project aims at exploring news ways of testing composite materials at high rates. In particular, the project focuses on transverse tension and shear, both intra and interlaminar. It is well known that such properties are difficult to measure using Kolsky bars because of the relatively low wave speeds and low strains to failure, preventing quasi-static equilibrium to be achieved before failure. As a consequence, reliable available data only span up to a few 100s of s-1. Recently, progress in ultra-high speed imaging has allowed a new methodology to emerge. The underpinning idea is to use acceleration fields obtained by ultra-high speed imaging of grid or speckle patterns to provide stress information through mechanical equilibrium. Moreover, the implementation of inertial impact enables for free edge reflection of the impeding compression wave to be turned into tension, providing tensile properties (stiffness and strength) without the need for any gripping of the test specimen. This methodology has been termed Image-Based Inertial Impact (IBII). In this project, the IBII methodology has been adapted so far to the transverse tensile properties of carbon/epoxy UD composites, as well as to interlaminar tension. Strain rates in the range of 1000s of s-1 were achieved with exceptional quality data to measure the stiffness and strength. Future work will extend it to intra and interlaminar shear, and the combination of transverse tension and shear.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 12, 2019
- Accession Number
- AD1077583
Entities
People
- Fabrice Pierron
Organizations
- University of Southampton