Scholarlink

Purpose <p>The use of carbon nanotubes as reinforcement fillers has been associated with improvements in the damping characteristics of composites. The occurrence of stick-slip motion, a phenomenon that leads to interfacial slippage depending on the loading conditions, is often regarded as the predominant reason for these effects. In this paper, a constitutive model is presented with the goal of incorporating the stick-slip mechanism into the stress-strain relationship of composites reinforced with carbon nanotubes, thereby enabling the vibration analysis of structural components.</p> Methodology <p>The model is built on a set of assumptions related to a representative volume element, regarding the characteristics of the individual components and the interactions between them. Its mathematical representation is achieved through algebraic piecewise functions. Free vibration analysis is applied to a discrete single degree-of-freedom system, assuming a rod finite element, and using Newmark’s method for integration over time.</p> Results and Conclusion <p>The resulting model establishes a non-linear, history-dependent, hysteretic constitutive relationship. Assuming a known harmonic response solution, the features of the model, particularly concerning the resulting loss factor, are evaluated. Furthermore, free vibration analysis of the rod element was conducted and discussed, enabling the assessment of the dissipative characteristics of the model on the transient response of the system.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Non-linear Constitutive Model to Represent Damping Phenomenon in CNT-reinforced Composites

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年7月18日

查看全文
  • Pedro Camacho,
  • Pedro Ribeiro,
  • Hamed Akhavan,
  • José Dias Rodrigues

摘要

Purpose

The use of carbon nanotubes as reinforcement fillers has been associated with improvements in the damping characteristics of composites. The occurrence of stick-slip motion, a phenomenon that leads to interfacial slippage depending on the loading conditions, is often regarded as the predominant reason for these effects. In this paper, a constitutive model is presented with the goal of incorporating the stick-slip mechanism into the stress-strain relationship of composites reinforced with carbon nanotubes, thereby enabling the vibration analysis of structural components.

Methodology

The model is built on a set of assumptions related to a representative volume element, regarding the characteristics of the individual components and the interactions between them. Its mathematical representation is achieved through algebraic piecewise functions. Free vibration analysis is applied to a discrete single degree-of-freedom system, assuming a rod finite element, and using Newmark’s method for integration over time.

Results and Conclusion

The resulting model establishes a non-linear, history-dependent, hysteretic constitutive relationship. Assuming a known harmonic response solution, the features of the model, particularly concerning the resulting loss factor, are evaluated. Furthermore, free vibration analysis of the rod element was conducted and discussed, enabling the assessment of the dissipative characteristics of the model on the transient response of the system.