Fatigue Behavior of Ni-Ti Alloy Endodontic Files under Ultrasonic Unconstrained Condition

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外文摘要：Nickel-titanium alloy are extensively used in engineering and biomedical fields for their excellent properties of shape-memory, super-elasticity and biocompatibility. Their fatigue performance has been attracted increasingly attention, because they are often used under cyclic conditions. In this paper, the ultrasonic fatigue behavior of nickel-titanium endodontic files under unconstrained condition has been studied using the self-designed ultrasonic fatigue testing equipment. The vibration and harmonious response properties of nickel-titanium endodontic files are also analyzed using finite element method. Experimental results show that the average ultrasonic fatigue life of nickel-titanium endodontic files under unconstrained conditions is more than 108. Fracture of the files always occurred at the position about 2 -3 mm near the file tip. Results of finite element analysis show that the maximum stress of the nickel-titanium endodontic files located at the position about 2-3 mm near the file tip, where is prone to generate fatigue cracks. The results of finite element analysis are consistent with the experimental results. The scanning electronic microscope (SEM) results show that the ultrasonic fatigue cracks always initiated at the surfaces of the files, where the secondary phases or impurities existed and induced fatigue cracks under repeated stress.

外文关键词：

fatigue behaviornickel-titanium (Ni-Ti) alloyendodontic filesultrasonic condition

作者：

Zhou Hui-min、Li Qing-fen、Zheng Yu-feng、Li Li

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作者单位：

Center for Biomedical Materials and Engineering, College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China

Center for Biomedical Materials and Engineering, College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China College of Mechanical and Electrical Engineering, Harbin Engineering University,Harbin 150001, China

出版年：

2010

Key engineering materials

ISSN：1013-9826

年,卷(期)：2010.417/418