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首页> 外文期刊>Journal of Materials Engineering and Performance >Effect of Prestrain on the Fatigue Life of Superelastic Nitinol
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Effect of Prestrain on the Fatigue Life of Superelastic Nitinol

机译：presthain对超弹性镍钛醇疲劳寿命的影响

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摘要

Three types of fatigue testing are performed to elucidate the effects of prestraining superelastic Nitinol on its subsequent fatigue lifetime: rotary bending and tension-tension testing of wire, and beam bending using diamond-shaped specimens fabricated from tubing. Results show that local plastic deformation during prestraining induces residual stresses that have a pronounced effect on fatigue performance, enhancing performance when the fatigue duty cycle is of the same sense as the prestraining (tensile prestraining followed by a tensile duty cycle, for example), and decreasing fatigue lifetime when the sense of the duty cycle is opposite to that of prestraining. This provides an avenue to increasing fatigue lifetime, but more importantly it highlights the need to fully understand the nature of the duty cycle: for example, prestraining a stent by crimping it into a delivery catheter induces favorable residual stresses with respect to subsequent pulsatile fatigue, but might accelerate fracture in other modes, such as axial or crush fatigue. Caution is also advised when trying to apply data from "constant life diagrams" derived from the literature (Ref 1, 2 for example) that may not properly reflect the strain history of the device being analyzed.
机译：进行三种类型的疲劳试验以阐明普拉克斯超弹性镍钛醇对其随后的疲劳寿命：旋转弯曲和张力张力试验，以及使用管道制造的菱形样品的轴弯曲。结果表明，普里普拉地局部塑性变形诱导残余应力对疲劳性能具有明显的影响，当疲劳占空比具有与普拉斯的普鲁斯（例如拉伸占循环之后的抗拉占循环的抗拉悬垂循环时）和当占空比的感觉与普拉斯坦的感觉相反时，减少疲劳寿命。这提供了提高疲劳寿命的途径，但更重要的是，它突出了完全理解占空比的性质的需要：例如，通过将其压制到输送导管中，将支架置于相对于随后的脉动疲劳的较好的残余应力，但可能会加速其他模式的骨折，例如轴向或粉碎疲劳。在尝试应用来自从文献（例如，例如ref 1,2）的“恒定寿命图”中应用数据时，还建议谨慎地建议，这可能无法正确地反映所分析的设备的应变历史。

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