| 摘要: |
| 基于ABAQUS有限元软件系统探究热等静压制备SiCf/Ti2AlNb复合材料过程中的致密化演变特征，
分析纤维排布方式、体积分数以及热等静压参数对复合材料致密化动力学行为的影响，探讨成型后材料内部残
余应力场的空间分布以及热压参数对残余应力的影响规律。结果表明，复合材料的热等静压致密化过程呈现出
5个阶段；相比四方纤维排布，六方纤维排布达到完全致密化的速度更快，但热等静压结束后，两种排布方式
下的相对密度趋于相同；当SiC纤维体积分数为45%时，复合材料相对密度最低；热等静压温度和压力与复合
材料的相对密度呈正相关；随着热等静压温度和压力升高，基体的径向热残余应力增加；适当提高热等静压压
力，可有效降低基体的环向残余拉应力。 |
| 关键词: 钛基复合材料 SiC纤维 致密化 残余应力 有限元模拟 |
| 基金项目:国家科技重大专项（HT-J****-VI-****-0121）；稳定支持项目（KZ0****526） |
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| Numerical Simulation of Hot Isostatic Pressing Densification Process of SiCf/Ti2AlNb Composites |
|
Yang Keyan1, Zhou Wenlong1, Wang Minjuan2, Fu Xuesong1, Chen Guoqing1, Huang Hao2
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1. School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024;2. Titanium Alloy
Research Institute, AECC Beijing Institute of Aeronautical Materials, Beijing 100095
钛合金研究所，北京100095
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| Abstract: |
| The finite element simulation method was used to study the hot isostatic pressing densification process
of SiCf/Ti2AlNb composites, to analyze the effects of fiber arrangement, fiber volume fraction and hot isostatic pressing
parameters on the densification of the composites and to explore the distribution of the thermal residual stresses in the
composites after molding, as well as the influence of the hot pressing parameters on the residual stresses. The results
show that the thermal isostatic densification process of the composites exhibits five stages; the hexagonal fiber
arrangement reaches full densification faster than the tetragonal fiber arrangement, but at the end of the thermal isostatic
pressing, the relative densities tend to be the same under both arrangements. The relative density of the composites is
lowest when the volume fraction of SiC fibers is 45%. Thermal isostatic pressing temperature and pressure are
positively correlated with the relative density of composites. As the thermal isostatic pressing temperature and pressure
increase, the radial thermal residual stress of the matrix increases. Appropriately increasing the thermal isostatic pressing
pressure can reduce the annular residual stress of the matrix. |
| Key words: TMCs SiC fiber densification residual stress finite element simulation |
