Damage Tolerance Analysis of Artificial Mechanical Heart Valve

doi:10.11901/1005.3093.2020.238

Chinese Journal of Materials Research

2021, Vol. 35

Issue (2): 128-134 DOI: 10.11901/1005.3093.2020.238

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Damage Tolerance Analysis of Artificial Mechanical Heart Valve

ZHANG Jianhui(

), XING Xing, RUAN Yepeng, SUN Zhenguo

School of Mechanical Engineering, Hangzhou Dianzi University, Hangzhou 310018, China

Cite this article:

ZHANG Jianhui, XING Xing, RUAN Yepeng, SUN Zhenguo. Damage Tolerance Analysis of Artificial Mechanical Heart Valve. Chinese Journal of Materials Research, 2021, 35(2): 128-134.

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Abstract

The structural reliability of artificial mechanical heart valve made of pyrolytic carbon was assessed by means of damage tolerance methodology. In particular, a conservative estimation concerning the possible life-time, or the number of loading cycles was established, in that estimated duration, the pyrolytic carbon artificial heart valve can operate properly in service under given physiological loadings until a pre-existing flaw of minimum size grows gradually to the critical size. It is shown that a minimum pre-existing defect size computed is typically of the order of tens of microns for such pyrolytic carbon valve, for structural life of any pyrolytic carbon component in excess of patient lifetimes. The use of such analysis must be regarded as an essential requirement for the design and quality control of new and the existing pyrolytic carbon artificial heart valve in order to provide maximum assurance of patient safety.

Key words: composite pyrolytic carbon for prosthetic heart valve damage tolerance analyses pre-existing defect size

Received: 17 June 2020

ZTFLH:

TB332

Fund: Major Science and Technology Projects of Zhejiang Province(2015C01035)

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	Jianhui ZHANG
	Xing XING
	Yepeng RUAN
	Zhenguo SUN

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https://www.cjmr.org/EN/10.11901/1005.3093.2020.238 OR https://www.cjmr.org/EN/Y2021/V35/I2/128

Fig.1 Schematic diagram of domestic-made mechanical heart valve prosthesis. 1-valve orifice; 2-valve leaflet; 3-valve ring; 4-reinforcing ring; 5-stiffening ring; 6-snap ring; 7-pivot; α-leaflet openning angle; β-leaflet closing angle

Table 1 Material parameters of the valve leaflet model

Fig.2 Finite element meshing of the valve leaflet

Fig.3 Boundary constraints of the valve leaflet

Fig.4 Operating stress distribution of the valve leaflet applied the first strength theory

Fig.5 Finite element meshing of residual thermal stress of the valve leaflet

Fig.6 Residual thermal stress distribution of the valve leaflet

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