Abstract
This study introduces a comprehensive experimental methodology allowing for the direct measurement of the rate dependent multiaxial response of polymer syntactic foams under combined direct-shear loading. The combined tension-torsion behaviour of a syntactic foam and its rate dependence are investigated for the first time.
Dynamic tension-torsion experiments were conducted using a newly developed Tension-Torsion Hopkinson Bar (TTHB) enabling the measurement of the combined tensile-shear response of engineering materials at high rates of strain.
The response and multiaxial failure envelope of a polyamide syntactic foam were experimentally measured and analysed to determine the combined influences of stress state, strain rate, and temperature. The multiaxial failure stress locus was defined in both the normal versus shear stress space and the principal stress space, providing a comprehensive characterisation of the behaviour of the material under various loading and environmental conditions.
The suitability of existing pressure dependent failure criteria to represent the measured experimental data was also assessed. The Drucker-Prager pressure dependent criterion proved to be effective in capturing the measured quasi-static and dynamic multi-axial stress loci at different temperatures.
The effects of temperature, loading rate and stress state on the deformation and failure modes were analysed by means of SEM micrographs of the tested samples.
Dynamic tension-torsion experiments were conducted using a newly developed Tension-Torsion Hopkinson Bar (TTHB) enabling the measurement of the combined tensile-shear response of engineering materials at high rates of strain.
The response and multiaxial failure envelope of a polyamide syntactic foam were experimentally measured and analysed to determine the combined influences of stress state, strain rate, and temperature. The multiaxial failure stress locus was defined in both the normal versus shear stress space and the principal stress space, providing a comprehensive characterisation of the behaviour of the material under various loading and environmental conditions.
The suitability of existing pressure dependent failure criteria to represent the measured experimental data was also assessed. The Drucker-Prager pressure dependent criterion proved to be effective in capturing the measured quasi-static and dynamic multi-axial stress loci at different temperatures.
The effects of temperature, loading rate and stress state on the deformation and failure modes were analysed by means of SEM micrographs of the tested samples.
| Original language | English |
|---|---|
| Article number | 109864 |
| Journal | International Journal of Mechanical Sciences |
| Volume | 286 |
| Early online date | 30 Nov 2024 |
| DOIs | |
| Publication status | Published - 15 Jan 2025 |
Data Availability Statement
Data will be made available on requestFunding
The research in this article was conducted independently and was not associated with any specific funding or project. However, Antonio Pellegrino and Yuan Xu would like to acknowledge Rolls Royce PLC and EPSRC for their previous support during the development of the experimental apparatus under the Prosperity Partnership Grant \u2018Cornerstone: Mechanical Engineering Science to Enable Aero Propulsion Futures\u2019 (Grant Ref: EP/R004951/1).
| Funders | Funder number |
|---|---|
| Rolls Royce PLC | |
| Engineering and Physical Sciences Research Council | EP/R004951/1 |
| Engineering and Physical Sciences Research Council |
Keywords
- Combined loading failure criteria
- Multiaxial failure stress loci
- Split hopkinson tension-torsion bar
- Strain rate dependency
- Syntactic foam
- Temperature dependency
ASJC Scopus subject areas
- Civil and Structural Engineering
- General Materials Science
- Condensed Matter Physics
- Aerospace Engineering
- Ocean Engineering
- Mechanics of Materials
- Mechanical Engineering
- Applied Mathematics