碳纤维增强复合材料微观烧蚀行为数值模拟

李伟; 方国东; 李玮洁; 王兵; 梁军

doi:10.6052/0459-1879-18-351

碳纤维增强复合材料微观烧蚀行为数值模拟

doi: 10.6052/0459-1879-18-351

李伟^*,
方国东^*2), ,,
李玮洁,
王兵^*,
梁军^†,;3), ,

* 哈尔滨工业大学特种环境复合材料技术国家级重点实验室,哈尔滨 150001
† 北京理工大学先进结构技术研究院,北京 100081

基金项目: 1) 国家自然科学基金资助项目(11732002,11672089).

详细信息

通讯作者:
方国东

方国东,梁军

中图分类号: O346.1;
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- 被引次数: 0
出版历程
- 收稿日期: 2018-10-24
- 刊出日期: 2019-05-18

NUMERICAL SIMULATION OF MICRO-ABLATION BEHAVIOR FOR CARBON FIBER REINFORCED COMPOSITES

Wei Li^*,
Guodong Fang^{*2)
, ,},
Weijie Li,
Bing Wang^*,
Jun Liang^{†,;3)
, ,}

* Science and Technology on Advanced Composites in Special Environment Key Laboratory, Harbin Institute of Technology, Harbin 150001,China
† Institute of Advanced Structure Technology,Beijing Institute of Technology,Beijing 100081,China

摘要

摘要: 碳纤维增强复合材料已广泛应用于烧蚀热防护系统中,其微观结构直接影响材料的烧蚀行为,因此材料微观烧蚀机制分析对材料设计和制备具有重要意义.本文采用有限体积法并引入固体相体积分数与界面重构技术,建立了碳纤维增强复合材料微观烧蚀数值模型.利用该微观烧蚀数值模型对碳基体包裹单根碳纤维进行烧蚀模拟,将数值模拟的烧蚀形貌与解析解结果进行对比,验证了数值求解方法的正确性.对单向碳纤维增强复合材料在不同碳纤维倾斜角下的微观烧蚀行为进行了模拟分析,得到了碳纤维倾斜角对微观烧蚀行为的影响规律.研究发现：对于碳纤维的抗氧化性能比基体强的情况,当氧扩散速率远远大于碳氧反应速率时,碳纤维将出现"笋尖"状的烧蚀形貌;当碳氧反应速率远远大于氧扩散速率时,纤维和基体将以相同速率烧蚀.当碳纤维的抗氧化性能比基体强时,纤维倾斜角会对材料微观烧蚀行为产生较大影响;相反,则影响不显著.
- 微观烧蚀 /
- 碳纤维 /
- 复合材料 /
- 数值模拟 /
- 倾斜角度
Abstract: Carbon fiber reinforced composites are widely used in ablative thermal protection systems (TPS). The microstructures of the composites are greatly related with the ablation behavior. Thus, the study of micro-ablation mechanisms of the composites is significant for the material design and manufacturing. A mathematic micro-ablation model is developed by using the finite-volume-method (FVM) combing with the piecewise linear interface calculation (PLIC) method. Comparing with the analytical results, the numerical method is validated by calculating the ablation morphologies for single fiber embedded in carbon matrix. The effect of carbon fiber inclination on the microscopic ablation behavior is studied for the unidirectional carbon reinforced composites with different carbon fiber inclination. The results are found that the ablation morphology for carbon fiber is bamboo shoot shape if the oxygen diffusion rate is far greater than that of carbon oxygen reaction when the oxidation resistance of carbon fibers is stronger than that of matrix. If the carbon oxygen reaction rate is far greater than that of oxygen diffusion, carbon fiber and matrix will be ablated at the same rate. When the oxidation resistance of carbon fiber is stronger than that of the matrix, the inclination angle of the carbon fiber has a great influence on the micro-ablation behavior of the material. On the contrary, the effect is not significant.
- micro-ablation /
- carbon fibre reinforced composites /
- numerical simulation /
- fiber inclination angle /

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