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Investigation on the Thermophysical Properties of Multi-Directional Textile Composites

Author: ZhangMo
Tutor: MengSongHe
School: Harbin Institute of Technology
Course: Engineering Mechanics
Keywords: C / C composites Multi - directional woven Thermophysical properties Finite Element Simulation
CLC: TB332
Type: Master's thesis
Year: 2008
Downloads: 81
Quote: 0
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Abstract


Multi- woven C / C composites at high temperatures due to its high specific strength and high specific modulus , excellent resistance to erosion / corrosion and thermal shock performance , has been successfully used in missile warheads , rocket engine throat , space shuttle and other key components of the nose cone and wing leading edge . In these applications , the material to withstand temperatures up to 3000 ℃ , grasp and understanding of thermophysical properties is crucial to clarify the mechanism of heat transfer and thermal structural behavior . For fine knitting puncture C / C composites , using FLASHLINETM 5000 heat conduction rate test instrument and MODEL 1252 thermal expansion test instrument , respectively, of their different direction thermal diffusion rate of the test than the heat capacity and thermal expansion coefficient , a test maximum temperature of 2500 ° C , thermal physical properties of the material changes with temperature . Established a three- woven C / C composite micromechanical model , using the finite element method , its thermal physical properties of the forecast . The results show that the thermal diffusivity and specific heat capacity of the numerical prediction results with the experimental test results agree well with the thermal expansion coefficient difference . Take into account the impact of component performance , the use of the geometric relationships , based on the experimental test results on the coefficient of thermal expansion of fiber bundles and matrix 600 ℃ identification, and back on behalf of the finite element model , the simulation results and experimental test results are in good agreement . In turn , will identify the components performance extended to the woven C / C composites, studies have shown that the thermal expansion coefficient with the experimental data are still significant gaps . Stagnation point ablation test the three thin arranges puncture C / C composite volume ablation of its internal microstructure analysis , and on this basis the thermal conductivity of the porosity and degree of graphitization the impact . The results show that the porosity of the material thermal conductivity significantly .

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CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Composite materials > Non-metallic composite materials
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