Ultrasound characterisation of features and defects in 2D and 3D woven composite materials

Speaker:
TAYONG, Rostand; University of Bristol; United Kingdom

Authors:
Tayong, R.B.; University of Bristol; United Kingdom
Smith, R.A.; University of Bristol; United Kingdom

ID: ECNDT-0403-2018
Download: PDF
Session: Composite Material - UT 3
Room: G1
Date: 2018-06-14
Time: 16:00 - 16:20

Woven composites are expected to be widely used in the automotive industry to achieve improved strength-to-weight ratios and reduce CO2 emissions. Woven composites are susceptible to various types of defects, which can considerably alter mechanical properties whilst only subtly changing the response to ultrasound excitation. However, use of the analytic signal in a way originally explored for non-woven composites has proven that these features can be detected and characterised using the instantaneous amplitude, phase and frequency. The presented study compares experimental results for real woven specimens with different stitching weaves with both analytical and 3D time-domain finite-element models to understand the response of these materials in the presence of defects such as broken yarns, missed stitches, porosity, draping distortions and changes of warp and weft spacings.
This work is performed with support from the UK Engineering and Physical Sciences Research Council (EPSRC) aimed at underpinning the design of more efficient composite structures and reducing the environmental impact of travel.