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| Mohamed, Tarek |
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| Azevedo, Nuno Monteiro |
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| Rignanese, Gian-Marco |
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Colombo, Chiara
Politecnico di Milano
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Publications (7/7 displayed)
- 2024Experimental investigation on low-velocity impact behavior of glass, Kevlar, and hybrid composites with an elastomeric polyurethane matrix
- 2024Exploiting small punch test for mechanical characterization of cold sprayed depositscitations
- 2022Insights on metallic particle bonding to thermoplastic polymeric substrates during cold spraycitations
- 2020Synchrotron radiation μ X-ray diffraction in transmission geometry for investigating the penetration depth of conservation treatments on cultural heritage stone materialscitations
- 2019Consolidation of building materials with a phosphate-based treatment : effects on the microstructure and on the 3D pore networkcitations
- 2014A review of thermographic techniques for damage investigation in compositescitations
- 2014Design and characterization of a biomimetic composite inspired to human bonecitations
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document
Experimental investigation on low-velocity impact behavior of glass, Kevlar, and hybrid composites with an elastomeric polyurethane matrix
Abstract
Low-velocity impacts represent a critical dynamic condition for engineering structures. Combining two reinforcing fibers in a single matrix, i.e., hybridization, is considered a feasible way to improve composite performance. In this context, this paper presents an experimental work on composites with Kevlar and glass fabrics and a novel thermoset polyurethane matrix. The coupons are manufactured by vacuum infusion technique and low-velocity impact tests are carried out. First, the impact behavior of Kevlar and glass laminates of different thicknesses is assessed, and then impact tests are performed on different configurations of hybrid laminates, both symmetric and non-symmetric. For the non-symmetric specimens, impact tests were conducted on both sides of the stack. Load vs displacement curves are reported along with absorbed energy. To investigate the damage mechanism, the front, back, and cross-section views of the specimens are analyzed, and features related to the stacking sequences are discussed. Thermographic analyses are carried out on the impacted specimens to further analyze damage. The failure mechanisms are different from traditional epoxy composites and a hybridization effect is reported. The results evidence that the hybrid coupons are viable for structural applications, being capable of absorbing high-impact energies, in particular, non-symmetric hybrid laminates outperformed the Kevlar, glass, and symmetric ones, absorbing roughly 15% less energy for the highest energy impact.