The loading-rate dependent tensile behavior of CNT film and its bismaleimide composite film
Autor: | Min Li, Yanjie Wang, Yongyi Zhang, Zuoguang Zhang, Mengsi Zhang, Shaokai Wang, Qingwen Li, Yizhuo Gu |
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Rok vydání: | 2017 |
Předmět: |
chemistry.chemical_classification
Materials science Mechanical Engineering Composite number 02 engineering and technology Polymer Carbon nanotube Strain rate 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences law.invention chemistry Magazine Mechanics of Materials law Ultimate tensile strength lcsh:TA401-492 lcsh:Materials of engineering and construction. Mechanics of materials General Materials Science Composite material 0210 nano-technology Necking Tensile testing |
Zdroj: | Materials & Design, Vol 117, Iss, Pp 37-46 (2017) |
ISSN: | 0264-1275 |
Popis: | Carbon nanotube (CNT) macroscopic assembly, as a promising candidate for the protective and anti-collision materials, has attracted lots of researchers to explore its mechanical behavior under different loading rates. In this paper, the loading-rate dependent mechanical behavior of CNT film and its composite with bismaleimide (BMI) matrix is investigated. The pristine CNT film shows decreased tensile strength by 33.8% when the loading rate increases from 0.05 mm/min to 40 mm/min. An obvious necking extending phenomenon is observed in the CNT film during the tensile test under lower tensile rates, e.g. 0.05 mm/min and 0.5 mm/min. However, the random composite film and the oriented composite film both display increased tensile strength, by 58.2% and 35.7% respectively, with the increasing loading rate from 0.05 mm/min to 40 mm/min. The different loading-rate dependence of tensile behavior is ascribed to the different tensile-induced motions of CNTs and CNT bundles in composite film. Moreover, strain rate sensitivity coefficients of different film are calculated according to a simplified Johnson-Cook model. The results suggest that the pristine CNT film with the strain rate sensitivity coefficient of −0.0941 has a high loading-rate sensitivity, meanwhile polymer infiltration and oriented alignment can weaken the loading-rate sensitivity of CNT film. Keywords: Carbon nanotube film, Polymer composite, Tensile properties, Loading-rate sensitivity |
Databáze: | OpenAIRE |
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