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<p>Composites reinforced by carbon nanotubes (CNTs) with extraordinary properties are increasingly used to improve the performance of structures under complex dynamic and thermal loading. This paper studies the transient response to a moving mass of inclined composite microbeams reinforced by CNTs, focusing on the influence of CNT agglomeration. The effective properties of the composite are temperature-dependent, and they are estimated by the Eshelby-Mori–Tanaka approach. Considering both the shear deformation and rotary inertia, a size-dependent finite element beam model is derived in the framework of the <i>n</i>-order shear deformation theory and the modified couple stress theory (MCST). The transverse shear rotation rather than the sectional rotation is adopted as an independent variable in the&#xa0;model which helps to fulfill a longitudinally linear variation of the bending strain. The transient response is predicted for a simply supported microbeam with different inclination angles and CNT volume fractions. The&#xa0;result reveals that the agglomeration reduces&#xa0;efficiency of the CNT reinforcement, and the increase of CNT volume fraction does not improve the transient response when the agglomeration is severe.&#xa0;The effect of temperature rise on the transient response is found to be&#xa0;governed by the degree of CNT agglomeration and the microstructural size effect. The effect of temperature rise is more pronounced when the CNT&#xa0;agglomeration&#xa0;is severe, while this effect becomes insignificant for the microbeam associated with a higher size scale parameter. The influence of the CNT reinforcement, inclination angle, and the size scale parameter on the thermoelastic transient behavior of the microbeams is studied in detail.</p>

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Thermoelastic Transient Response to a Moving Mass of Inclined Composite Microbeams Reinforced by Carbon Nanotubes with Agglomeration Effect

  • 期刊论文

  • 发表日期：

    2025年6月18日

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  • Thi Thom Tran,
  • Dinh Kien Nguyen

摘要

Composites reinforced by carbon nanotubes (CNTs) with extraordinary properties are increasingly used to improve the performance of structures under complex dynamic and thermal loading. This paper studies the transient response to a moving mass of inclined composite microbeams reinforced by CNTs, focusing on the influence of CNT agglomeration. The effective properties of the composite are temperature-dependent, and they are estimated by the Eshelby-Mori–Tanaka approach. Considering both the shear deformation and rotary inertia, a size-dependent finite element beam model is derived in the framework of the n-order shear deformation theory and the modified couple stress theory (MCST). The transverse shear rotation rather than the sectional rotation is adopted as an independent variable in the model which helps to fulfill a longitudinally linear variation of the bending strain. The transient response is predicted for a simply supported microbeam with different inclination angles and CNT volume fractions. The result reveals that the agglomeration reduces efficiency of the CNT reinforcement, and the increase of CNT volume fraction does not improve the transient response when the agglomeration is severe. The effect of temperature rise on the transient response is found to be governed by the degree of CNT agglomeration and the microstructural size effect. The effect of temperature rise is more pronounced when the CNT agglomeration is severe, while this effect becomes insignificant for the microbeam associated with a higher size scale parameter. The influence of the CNT reinforcement, inclination angle, and the size scale parameter on the thermoelastic transient behavior of the microbeams is studied in detail.