Hyperelastic Hybrid Molecular Chain Model of Thermal-Oxidative Aging Viscoelastic Damping Materials Based on Physical–Chemical Process
Publication: Journal of Engineering Mechanics
Volume 149, Issue 1
Abstract
The viscoelastic damping materials (VDMs) used in the viscoelastic (VE) damping equipment may undergo thermal-oxidative aging during long-time exposure to complicated working environments and exhibit significant property degradation in their lifespan. Therefore, it is imperative to comprehend the mechanical performance of VDMs after aging. In this paper, the molecular chains of VDMs are categorized into elastic chains and free chains, and the effects of variable physical–chemical reactions in the thermal-oxidative aging process on these two kinds of chains are analyzed and then mathematically described based on the theory of chemical kinetics. By introducing the molecular chain statistical model to consider the influence of microstructure change on the macroscopic mechanical behavior of VDMs, a hyperelastic hybrid molecular chain model for thermal-oxidative aging VDMs is addressed in conjunction with the tube constraint model and filler reinforcement theory. Combined with the test data, the accuracy and applicability of the proposed model are comparatively evaluated, and the sensitivity analyses on the mechanical parameters and aging parameters of the proposed model are also conducted. The verified results suggest that the proposed model can reflect the mechanical behavior of aging VDMs during thermal-oxidative conditions with remarked accuracy. The results of the parameters analyses display that the macroscopic mechanical property of VDMs is prominently affected by their macromolecular chain structure, and the physical–chemical reactions occurring in the aging process synthetically play a collaborative influence on the mechanical performance of aging VDMs.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
The authors acknowledge the financial support for this research from National Key Research and Development Plans with Grant No. 2019YFE0121900, the Program of Chang Jiang Scholars of the Ministry of Education, the Tencent Foundation through the XPLORER PRIZE, the Program of China Scholarships Council with Grant No. 202006090290, and the Key Project of Collaborative Innovation Center of Shaanxi Provincial Department of Education with Grant No. 22JY029.
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Published In
Journal of Engineering Mechanics
Volume 149 • Issue 1 • January 2023
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Jun 20, 2022
Accepted: Sep 8, 2022
Published online: Nov 14, 2022
Published in print: Jan 1, 2023
Discussion open until: Apr 14, 2023
ASCE Technical Topics:
- Aging (material)
- Continuum mechanics
- Damping
- Deterioration
- Dynamics (solid mechanics)
- Engineering fundamentals
- Engineering mechanics
- Material mechanics
- Material properties
- Materials characterization
- Materials engineering
- Mathematical models
- Model accuracy
- Models (by type)
- Rheology
- Solid mechanics
- Structural dynamics
- Thermal analysis
- Thermal effects
- Thermodynamics
- Viscoelasticity
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