考虑过渡界面相的单向Cf/C复合材料界面脱黏有限元模拟研究
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厦门大学航空航天学院,厦门 361005

作者简介:

许伟伟,副教授,主要从事新型金属、复合和功能材料的多尺度成分设计与性能优化等相关理论和实验研究工作。Email:wwxu306@ xmu.edu.cn

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V45

基金项目:

福建省自然科学基金项目(2020J01051)、厦门市青年创新基金项目(3502Z20206057)、国家自然科学基金面上项目(11972136)、国家自然科学基金企业创新发展联合基金(U22B20132)、中央高校基本科研业务费(20720230036)


Finite Element Simulation for Interfacial Debonding of Unidirectional-Cf/C Composites by Considering Transition Interphase
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School of Aeronautics and Astronautics, Xiamen University,Xiamen 361005

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    摘要:

    建立合理的复合材料界面模型并系统分析纤维脱黏过程是解析Cf/C防热复合材料损伤失效微观机制的关键。本研究基于实验文献报道,考虑纤维与基体间亚微米尺度的界面过渡区,提出了一种包含纤维、界面相、基体三相的界面模型。采用指数梯度模型对界面相的平均力学性能进行校准,并对比分析了传统两相和改进三相界面处理方式在预测材料有效弹性性能上的差异性。模拟结果显示三相模型相比两相模型能够更为精确地模拟出材料的整体力学响应行为。进一步地,使用该三相模型对单纤维顶出实验进行模拟,分析界面参数对纤维渐进脱黏过程的影响。研究结果表明:当界面临界断裂能释放率与内聚力强度的取值分别为0.001~0.006 N/mm和13~33 MPa时,纤维的最大顶出力与这两个参数均呈正相关,超出该范围提升效果不再显著;增大界面临界断裂能释放率或减小内聚力强度可以延缓界面完全损伤的过早发生,提升界面的断裂韧性。此外,通过试验-仿真结合的细观力学方法对界面内聚参数进行校准。分析结果将为后续多尺度研究Cf/C复合材料界面损伤机制提供理论支撑。

    Abstract:

    Establishing a reasonable interface model for composites and systematically analyzing the fiber debonding process were the key to analyzing the microscopic mechanism of damage and failure in heat resistant Cf/C composite. This study was based on experimental literature reports, considering the submicron scale interfacial transition zone between fiber and matrix, and proposed an interface model that includes fiber, interphase and matrix. The exponential gradient model was used to calibrate the average mechanical properties of the interphase, and the differences between the traditional two-phase and improved three-phase interface treatments were compared and analyzed in predicting the effective elastic properties of the material. The simulation results show that the three-phase model can simulate the overall mechanical response behavior of the material more accurately than that of the two-phase model. Further, the three-phase model was used to simulate single fiber push-out experiment to analyze the effect of interfacial parameters on the progressive debonding process of the fiber. The results indicate that when the release rate of interficial critical fracture energy and cohesive strength are 0.001~0.006 N/mm and 13~33 MPa, respectively, the maximum ejection force of the fiber is positively correlated with these two parameters; beyond this range, the enhancement effect is no longer significant. Increasing the release rate of interficial critical fracture energy or decreasing the cohesive strength can delay the premature occurrence of complete damage at the interface and improve the fracture toughness of the interface. In addition, the cohesive parameters are calibrated by a combined experimental-simulation approach. The analysis results will provide theoretical support for the subsequent multi-scale research on the interfacial damage mechanism of Cf/C composites.

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李正宁,黄清涟,陈立杰,金华,许伟伟.考虑过渡界面相的单向Cf/C复合材料界面脱黏有限元模拟研究[J].宇航材料工艺,2024,54(5):14-23.

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  • 收稿日期:2023-02-20
  • 最后修改日期:2023-05-21
  • 录用日期:2023-05-29
  • 在线发布日期: 2024-12-03
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