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Compressive strength after blast of sandwich composite materials
1Department of Mechanical Engineering, Imperial College London, , London SW7 2AZ, UK.
Summary
Naval vessels can benefit from composite sandwich panels, but their blast performance is unclear. This study quanties the residual strength of carbon-fibre-reinforced polymer (CFRP) and glass-fibre-reinforced polymer (GFRP) sandwich panels after air blast events.
Area of Science:
- Materials Science
- Naval Engineering
- Explosion Mechanics
Background:
- Composite sandwich materials offer advantages for naval construction, including high strength-to-weight ratios and low radar signatures.
- Limited understanding of composite sandwich material performance under air blast conditions hinders their adoption in naval vessels.
- Assessing residual strength after blast damage is crucial for ensuring structural integrity and safety in naval applications.
Purpose of the Study:
- To investigate the residual strength of composite sandwich panels after exposure to air blast loading.
- To compare the blast performance of carbon-fibre-reinforced polymer (CFRP) and glass-fibre-reinforced polymer (GFRP) sandwich panels.
- To provide experimental data on the post-blast compressive load-bearing capacity of naval composite structures.
Main Methods:
- Full-scale blast experiments were conducted on 1.6×1.3m composite sandwich panels.
- Panels were subjected to a 100kg TNT equivalent air blast at a scaled distance of 3.02m·kg⁻¹/³.
- High-speed speckle strain mapping was used to analyze panel performance during blast events.
- Residual compressive strength was experimentally determined using loading conditions relevant to in-service naval vessels.
Main Results:
- CFRP and GFRP sandwich panels were evaluated for their performance under air blast.
- High-speed imaging and strain mapping provided insights into damage mechanisms.
- Experimental data on residual compressive strength after blast loading was collected.
- The study contributes to understanding the survivability of composite structures in explosive environments.
Conclusions:
- The research provides critical data on the residual strength of composite sandwich panels post-air blast.
- Findings will inform the design and application of these materials in naval vessels.
- Further research into blast-resistant composite structures is warranted for enhanced naval platform survivability.
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