Development of Image-Based High Strain Rate Tests for Adhesively Bonded Joints
Abstract
A post-doctoral researcher, Dr Vinay Shekar, has been successfully hired and established in Southampton. He has a background in blast/impact. He did his PhD in the group led by Prof. Gerald Nurick at the University of Cape Town. Dr Shekar was trained on the many aspects of the projects he needed to master: understanding the Virtual Fields Method and its application to inertial tests; understanding the Matlab code use to process the data, and adapting it to bonded joints; learning how to run parametric models in Abaqus explicit for the finite element sweeps; Health and Safety training in the lab, and training on the gas gun. A brief literature survey on high strain rate testing of adhesives and bonded joints was undertaken by Dr Shekhar. Two adhesive systems were identified and sourced after consultation with, on the one side, Vipul Ranatunga (AFRL, Dayton OH) and on the other, Joe Shaefer and Brian Justusson from Boeing. A bulk adhesive, Loctite EA9394 and Solvay's FM-300 tape adhesive were selected. Manufacturing routes for both bulk adhesive and bonded joint specimens were set in place, using vacuum to avoid porosities. Good quality specimens were obtained for the bulk EA9394 adhesive and for the bonded joints. Aluminium was selected as the substrate for the bonded joints, and brass was used for the waveguides and impactors as it matched better the average wave speed in the tested specimens. Testing the tape adhesive was abandoned because of the very small bondlines it created which would have needed more research to find a suitable data processing approach. The tests were replaced by solid bulk adhesive specimens to have a reference for the mechanical properties to check against for the bonded joints tests. Four bulk adhesive specimens were tested in the IBII configuration and very consistent stiffness values were obtained, showing a 20 dynamic amplification factor on both Youngs and shear moduli (compared to existing data on this adhesive
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 24, 2024
- Accession Number
- AD1229730
Entities
People
- Fabrice Pierron
Organizations
- University of Southampton