Electrical self-sensing of strain and damage of thermoplastic hierarchical composites subjected to monotonic and cyclic tensile loading
| Autor: | A. May-Pat, C. Martin-Barrera, Omar Rodríguez-Uicab, A. Can-Ortiz, Francis Avilés, P. I. Gonzalez-Chi |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Polypropylene
chemistry.chemical_classification Materials science Self sensing Thermoplastic Strain (chemistry) Mechanical Engineering 02 engineering and technology Carbon nanotube 010402 general chemistry 021001 nanoscience & nanotechnology Smart material 01 natural sciences 0104 chemical sciences law.invention Aramid chemistry.chemical_compound chemistry law Ultimate tensile strength General Materials Science Composite material 0210 nano-technology |
| Zdroj: | Journal of Intelligent Material Systems and Structures. 30:1527-1537 |
| ISSN: | 1530-8138 1045-389X |
| DOI: | 10.1177/1045389x19835962 |
| Popis: | Electrical monitoring of strain and damage in multiscale hierarchical composites comprising unidirectional aramid fibers modified by multiwall carbon nanotubes and polypropylene as matrix is investigated. The key factor for electrical self-sensing in these thermoplastic composites is the formation of a multiwall carbon nanotube network, which is achieved by using two material architectures. In the first architecture, the multiwall carbon nanotubes are dispersed within the polypropylene matrix, while aramid fibers remain unmodified. The second architecture uses also multiwall carbon nanotube-modified polypropylene matrix, but the aramid fibers are also modified by depositing multiwall carbon nanotubes. Under tensile loading, the electrical response is nonlinear with strain ( ε), and the piezoresistive sensitivity was quantified by gage factors corresponding to low ( ε 0.3%) strain regimes. Such gage factors were 4.83 (for ε 0.3%) for composites containing multiwall carbon nanotubes only in the polypropylene matrix. The composites containing multiwall carbon nanotubes in the matrix and fibers presented higher piezoresistive sensitivity, with average gage factors of 9.24 ( ε 0.3%). The higher sensitivity to strain and damage for a specific material architecture was also evident during cyclic and constant strain loading programs and is attributed to the preferential localization of multiwall carbon nanotubes in the hierarchical composite. |
| Databáze: | OpenAIRE |
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