首页> 外文期刊>Journal of the mechanical behavior of biomedical materials >Mechanical properties of a nanoporous membrane used in implantable medical devices. Correlation between experimental characterization and 2D numerical simulation
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Mechanical properties of a nanoporous membrane used in implantable medical devices. Correlation between experimental characterization and 2D numerical simulation

机译:植入医疗装置中使用的纳米多孔膜的力学性能。 实验表征与2D数值模拟的相关性

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Abstract Nanoporous membranes are used for the elaboration of implantable medical devices. In order to guaranty their integrity after implantation in a patient body, it is necessary to characterize the microstructure and the mechanical behavior of such membranes. They present randomly distributed pores around 1 μm in diameter at the surface. X-ray nanotomography permits to get the geometry of the pores through the thickness with a reduction of the diameter in the core. A multiscale study is done to characterize the membranes: macroscopic tensile tests permit to get the behavior law of the non porous material and in situ tensile tests are carried on in a Scanning Electron Microscope in order to observe the evolution of pores and cracks during loading. A 2D Finite Element Model is also developed in parallel. The confrontation between experiments and numerical simulations permit to validate the accuracy of the model. The latter is then used to simulate several types of loadings considering various pore distributions and sizes. Graphical abstract Display Omitted Highlights ? Complete microstructural characterization of the membranes using nanotomography. ? Mechanical behavior at several scales. ? In situ observations during loading in SEM. ? Predictive Finite Element Model developed and comparison with experiments. ? Use of the model to validate the safety of the medical device. ]]>
机译:摘要纳米多孔膜用于拟订可植入的医疗装置。为了在植入患者体内植入后保证它们的完整性,需要表征这种膜的微观结构和机械行为。它们在表面的直径直径约为1μm的随机分布的孔。 X射线纳米图允许通过芯中的直径降低,使孔的几何形状通过芯中的直径降低。进行多尺度研究以表征膜:宏观拉伸试验允许得到非多孔材料的行为定律,并且原位拉伸试验在扫描电子显微镜中进行,以观察孔隙过程中的孔隙和裂缝的演变。 2D有限元模型也是平行开发的。实验与数值模拟之间的对抗允许验证模型的准确性。然后,后者用于模拟考虑各种孔隙分布和尺寸的几种类型的装载。图形抽象显示省略了亮点?使用纳米分析膜的完全微观结构表征膜。还几个尺度的机械行为。还在SEM加载过程中的原位观察。还预测有限元模型与实验开发和比较。还使用模型以验证医疗设备的安全性。 ]]>

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