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中国生物医学工程学报
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人工心瓣热解炭断裂韧性有限元分析
杭州电子科技大学机械工程学院,杭州 310018
Finite Element Analysis of Fracture Toughness of Pyrolytic Carbon in Prosthetic Heart Valve
School of Mechanical Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
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摘要 利用有限元分析软件ANSYS,对人工心瓣各向同性热解炭和热解炭包覆石墨复合材料进行紧凑拉伸以及三点弯曲实验仿真分析,计算材料的平面应变断裂韧性KIC,并将计算结果与相关实验结果进行对比,分析利用ANSYS计算KIC方法的有效性,以及涂层与基体厚度比、裂纹尖端半径对热解炭包覆石墨复合材料KIC值的影响。结果表明,纯热解炭和石墨材料的ANSYS计算KIC值分别为1176 MPa以及1.415 MPa 与相关实验结果接近,验证了ANSYS计算KIC值的准确性;热解炭包覆石墨复合材料的计算KIC值随涂层与基体厚度比的增加而降低,涂层与基体厚度比偏低时,复合材料断裂性能均优于纯热解炭和石墨材料;热解炭包覆石墨材料存在临界裂纹尖端半径ρ0(约5 μm)。当裂纹尖端半径ρ>ρ0时,KIC测量值与ρ1/2成正比;ρ<ρ0时,KIC测量值与尖锐裂纹样品测量值一致。
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作者相关文章
张建辉*邢兴
关键词 热解炭热解炭包覆石墨ANSYS断裂韧性    
Abstract:This article  used ANSYS to conduct simulation analysis of compact tension and 3 points bending test for the isotropic pyrolytic carbon and pyrolytic carboncoated graphite composite material used in heart valve prosthesis, calculated the plane strain fracture toughnessKIC and compared the calculated results with the results of related experiments, then analyzed the effectiveness of the method that used ANSYS to calculateKIC as well as the influence of the thickness ratio of the coating and substrate and crack tip radius for theKIC of pyrolytic carboncoated graphite composite material. Results showed that theKIC of the pure pyrolytic carbon and graphite material were respectively 1.176 MPa and 1415 MPa, which were close to the results of related experiments, verifying the accuracy of using ANSYS to calculateKIC; theKIC of composite material of pyrolytic carboncoated graphite reduced with the increase of thickness ratio for the coating and substrate. The fracture toughness of composite material was better than that of pure pyrolytic carbon or graphite composite material when the thickness ratio of coating and substrate was on the low side; pyrolitic carboncoated graphite had a limit notch root radiusρ0, which was about 5 μm, when the notch root radiusρ>ρ0, the measured value of KIC was proportional toρ1/2, and when ρ<ρ0, the measured value of KIC was in line with the value of samples with sharp crack.
Key wordspyrolytic carbon    pyrolytic carbon-coated graphite    ANSYS    fracture toughness
    
基金资助:国家自然科学基金(50975070);浙江省自然科学基金(LY12E05002)
引用本文:   
张建辉*邢兴. 人工心瓣热解炭断裂韧性有限元分析[J]. 中国生物医学工程学报, 2012, 31(6): 889-894.
ZHANG Jian HuiXING Xing. Finite Element Analysis of Fracture Toughness of Pyrolytic Carbon in Prosthetic Heart Valve. journal1, 2012, 31(6): 889-894.
链接本文:  
http://cjbme.csbme.org/CN/10.3969/j.issn.0258-8021.2012.06.013     或     http://cjbme.csbme.org/CN/Y2012/V31/I6/889
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