人工心瓣热解炭断裂韧性有限元分析

doi:10.3969/j.issn.0258-8021.2012.06.013

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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K_IC　and compared the calculated results with the results of related experiments, then analyzed the effectiveness of the method that used ANSYS to calculateK_IC as well as the influence of the thickness ratio of the coating and substrate and crack tip radius for theK_IC　of pyrolytic carboncoated graphite composite material. Results showed that theK_IC of the pure pyrolytic carbon and graphite material were respectively 1.176 MPa $\100dpi \inline \sqrt{m}$ and 1415 MPa $\100dpi \inline \sqrt{m}$ ， which were close to the results of related experiments, verifying the accuracy of using ANSYS to calculateK_IC; theK_IC 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 K_IC was proportional toρ^1/2, and when ρ<ρ₀, the measured value of K_IC was in line with the value of samples with sharp crack.

Key words： pyrolytic carbon pyrolytic carbon-coated graphite ANSYS fracture toughness

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	ZHANG Jian Hui^*XING Xing

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ZHANG Jian Hui^*XING Xing. Finite Element Analysis of Fracture Toughness of Pyrolytic Carbon in Prosthetic Heart Valve[J]. journal1, 2012, 31(6): 889-894.

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http://cjbme.csbme.org/EN/10.3969/j.issn.0258-8021.2012.06.013 OR http://cjbme.csbme.org/EN/Y2012/V31/I6/889

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