Experimental investigation on a fully thermoplastic composite subjected to repeated impacts
| Autor: | Simonetta Boria, Alessandro Scattina, Giovanni Belingardi |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
repeated impact tests Mechanical Engineering Stiffness 02 engineering and technology Composite laminates 021001 nanoscience & nanotechnology 020303 mechanical engineering & transports 0203 mechanical engineering medicine Laminated thermoplastic composite damage tolerance Composite material medicine.symptom 0210 nano-technology Damage tolerance Laminated thermoplastic composite repeated impact tests damage tolerance Thermoplastic composites |
| Zdroj: | Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science. 233:6985-7002 |
| ISSN: | 2041-2983 0954-4062 |
| DOI: | 10.1177/0954406219866883 |
| Popis: | In the last years, the spread of composite laminates into the engineering sectors was observed; the main reason lies in higher values of strength/weight and stiffness/weight ratios with respect to conventional materials. Firstly, the attention was focused on fibres reinforced with thermosetting matrix. Then, the necessity to move towards low density and recyclable solutions has implied the development of composites made with thermoplastic matrix. Even if the first application of thermoplastic composites can be found into no structural parts, the replacement of metallic structural parts with such material in areas potentially subjected to impact has become worthy of investigation. Depending on the field of application and on the design geometry, in fact, some components can be subjected to repeated impacts at localized sites either during fabrication, activities of routine maintenance or during service conditions. When composite material was adopted, even though the impact damage associated to the single impact event can be slight, the accumulation of the damage over time may seriously weaken the mechanical performance of the structure. In this overview, the capability of energy absorption of a new composite completely made of thermoplastic material was investigated. This material was able to combine two conflicting requirements: the recyclability and the lightweight. In particular, repeated impacts at low velocity, on self-reinforced laminates made of polypropylene (PP), were conducted by experimental drop dart tests. Repeated impacts up to the perforation or up to 40 times were performed. In the analysis, three different energy levels and three different values of the laminate thicknesses were considered in order to analyse the damage behaviour under various experimental configurations. A visual observation of the impacted specimens was done, in order to evaluate the damage progression. Moreover, the trend of the peak force interchanged between specimen and dart and the evolution of both the absorbed energy and of the bending stiffness with the impacts number were studied. The results pointed out that the maximum load and the stiffness of the specimens tended to grow increasing the number of the repeated impacts. Such trend is opposite compared to the previous results obtained by other researchers using thermosetting composites. |
| Databáze: | OpenAIRE |
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