{"title":"Homogenization-based analysis of pyrolysis and mechanical degradation of ablative silica fiber-reinforced phenolic resin composites","authors":"","doi":"10.1016/j.ijheatmasstransfer.2024.126328","DOIUrl":null,"url":null,"abstract":"<div><div>Silica fiber-reinforced phenolic resin composites (SiFPRCs), characterized by exceptional insulative properties and ablation resistance, are widely utilized in thermal protection systems (TPS) and structural materials for hypersonic vehicles. Under extreme thermal conditions, the physicochemical ablative processes, including severe local thermal conduction, decomposition, and structural failure, lead to complex variations in thermomechanical properties. This study developed a homogenization-based thermomechanical model to investigate the micro-ablation characteristics of SiFPRCs and the resultant overall mechanical degradation. The ablation rate and porosity evolution were experimentally analyzed firstly, through oxyacetylene ablation experiments and mechanical property tests coupled with high-precision CT technology. Within the framework of non-equilibrium dissipative thermodynamics, a cross-scale consistent thermomechanical model integrating heat conduction and pyrolysis reaction characteristics of SiFPRCs was developed and implemented through a nonlinear finite element algorithm. After calibration and validation through comparison with experimental results, the developed model was applied to examine multiple thermal dissipation mechanisms, including thermal decomposition of phenolic resin, heat blocking effects, phase transitions in silica fibers, carbo-silicon reactions, and mechanical degradation. This research provides robust theoretical support and a design foundation for the development and application of high-performance TPS materials.</div></div>","PeriodicalId":336,"journal":{"name":"International Journal of Heat and Mass Transfer","volume":null,"pages":null},"PeriodicalIF":5.0000,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Heat and Mass Transfer","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0017931024011578","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, MECHANICAL","Score":null,"Total":0}
引用次数: 0
Abstract
Silica fiber-reinforced phenolic resin composites (SiFPRCs), characterized by exceptional insulative properties and ablation resistance, are widely utilized in thermal protection systems (TPS) and structural materials for hypersonic vehicles. Under extreme thermal conditions, the physicochemical ablative processes, including severe local thermal conduction, decomposition, and structural failure, lead to complex variations in thermomechanical properties. This study developed a homogenization-based thermomechanical model to investigate the micro-ablation characteristics of SiFPRCs and the resultant overall mechanical degradation. The ablation rate and porosity evolution were experimentally analyzed firstly, through oxyacetylene ablation experiments and mechanical property tests coupled with high-precision CT technology. Within the framework of non-equilibrium dissipative thermodynamics, a cross-scale consistent thermomechanical model integrating heat conduction and pyrolysis reaction characteristics of SiFPRCs was developed and implemented through a nonlinear finite element algorithm. After calibration and validation through comparison with experimental results, the developed model was applied to examine multiple thermal dissipation mechanisms, including thermal decomposition of phenolic resin, heat blocking effects, phase transitions in silica fibers, carbo-silicon reactions, and mechanical degradation. This research provides robust theoretical support and a design foundation for the development and application of high-performance TPS materials.
期刊介绍:
International Journal of Heat and Mass Transfer is the vehicle for the exchange of basic ideas in heat and mass transfer between research workers and engineers throughout the world. It focuses on both analytical and experimental research, with an emphasis on contributions which increase the basic understanding of transfer processes and their application to engineering problems.
Topics include:
-New methods of measuring and/or correlating transport-property data
-Energy engineering
-Environmental applications of heat and/or mass transfer