Rotating bending fatigue response of laser processed porous NiTi alloy

被引：31
|
作者：
Bernard, Sheldon [1 ]
Balla, Vamsi Krishna [1 ]
Bose, Susmita [1 ]
Bandyopadhyay, Amit [1 ]
机构：
[1] Washington State Univ, Sch Mech & Mat Engn, WM Keck Biomed Mat Res Lab, Pullman, WA 99164 USA
来源：
MATERIALS SCIENCE & ENGINEERING C-MATERIALS FOR BIOLOGICAL APPLICATIONS | 2011年 / 31卷 / 04期
基金：
美国国家科学基金会;
关键词：
Laser processing; NiTi alloy; Porous; Rotating bending; Fatigue; Mechanical properties; SHAPE-MEMORY ALLOY; TI-NI; CRACK GROWTH; MICROSTRUCTURE; DEFORMATION; PROPAGATION; STRENGTH; STRESS; TUBE; LIFE;
D O I：
10.1016/j.msec.2010.12.007
中图分类号：
TB3 [工程材料学]; R318.08 [生物材料学];
学科分类号：
0805 ; 080501 ; 080502 ;
摘要：
Porous implants are known to promote cell adhesion and have low elastic modulus, a combination that can significantly increase the life of an implant. However, porosity can significantly reduce the fatigue life of porous implants. Very little work has been reported on the fatigue behavior of bulk porous metals, specifically on porous nitinol (NiTi) alloy. In this article, we report high-cycle rotating bending fatigue response of porous NiTi alloys fabricated using Laser Engineered Net Shaping (LENS (TM)). Samples were characterized in terms of monotonic mechanical properties and microstructural features. Rotating bending fatigue results showed that the presence of 10% porosity in NiTi alloys can decrease the actual fatigue failure stress, at 10(6) cycles, up to 54% and single reversal failure stress by similar to 30%. From fractographic analysis, it is clear that the effect of surface porosity dominates the rotating bending fatigue failure of porous NiTi samples. (C) 2010 Elsevier B.V. All rights reserved.
引用
收藏
页码：815 / 820
页数：6
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