| Effect of fiber distribution on residual thermal stress in titanium matrix composite |
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| 作者姓名： | 马志军 杨延清 朱艳 陈彦 |
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| 作者单位： | DepartmentofMaterialsScienceandEngineering,NorthwesternPolytechnicalUniversity,Xi＇an710072,China |
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| 基金项目： | Project(50371069)supportedbytheNationalNaturalScienceFoundationofChina,project(J1500E002)supportedbytheNationalDefenseFundamentalResearchProgramofChina,project (51412020401HK03 02)supportedbytheAdvancedResearchFoundationforWeaponEquipmentofChina |
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| 摘 要： | Residual thermal stresses (RTS) of SCS-6 SiC/Ti-24Al-11Nb composite were analyzed by using finite element method (FEM). Three models of fiber array in the composite and the effect of fiber distance on the RTS were discussed. In all the three models compressive stress was found in the radial direction and tensile stress in the tangential direction. It is pointed out that, in real composite system, hexagonal fiber geometry is superior because the distribution and the magnitude of the residual stress are similar to those in single fiber model. In square fiber geometry, it is easier to make the matrix crack due to the larger residual tangential stress. RTS becomes very large and changes violently when the fiber distance is less than 15μm or so, therefore too high fiber volume is apt to result in matrix crack.
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| 关 键 词： | 钛合金 SiC纤维 残余热压力 有限元 FEM RTS 数值模拟 |
Effect of fiber distribution on residual thermal stress in titanium matrix composite |
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| MA Zhi-jun,YANG Yan-qing,ZHU Yan,CHEN Yan.Effect of fiber distribution on residual thermal stress in titanium matrix composite[J].Transactions of Nonferrous Metals Society of China,2004,14(2):330-334. |
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| Authors: | MA Zhi-jun YANG Yan-qing ZHU Yan CHEN Yan |
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| Abstract: | Residual thermal stresses (RTS) of SCS-6 SiC/Ti-24Al-11Nb composite were analyzed by using finite element method (FEM). Three models of fiber array in the composite and the effect of fiber distance on the RTS were discussed. In all the three models compressive stress was found in the radial direction and tensile stress in the tangential direction. It is pointed out that, in real composite system, hexagonal fiber geometry is superior because the distribution and the magnitude of the residual stress are similar to those in single fiber model. In square fiber geometry, it is easier to make the matrix crack due to the larger residual tangential stress. RTS becomes very large and changes violently when the fiber distance is less than 15μm or so, therefore too high fiber volume is apt to result in matrix crack. |
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| Keywords: | titanium matrix composite SiC fiber residual thermal stress finite element method |
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