کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7207911 | 1469084 | 2016 | 13 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Evaluating the macroscopic yield behaviour of trabecular bone using a nonlinear homogenisation approach
ترجمه فارسی عنوان
ارزیابی رفتار عملکرد ماکروسکوپیک استخوان ترابکولر با استفاده از یک روش همگن سازی غیر خطی
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کلمات کلیدی
(CT)Trabecular bone - استخوان اسفنجی یا استخوان ترابکولار Finite element - المان محدودcomputed tomography - توموگرافی کامپیوتری یا سی تی اسکن یا مقطعنگاری رایانهایMessage passing interface - رابط عبور پیامFinite elements - روش اجزای محدودYield surface - سطح عملکردRepresentative volume element - عنصر حجم نمایندهMultiscale modelling - مدل سازی چند بعدیAnisotropic material - مواد غیر انعکاسی
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی پزشکی
چکیده انگلیسی
Computational homogenisation approaches using high resolution images and finite element (FE) modelling have been extensively employed to evaluate the anisotropic elastic properties of trabecular bone. The aim of this study was to extend its application to characterise the macroscopic yield behaviour of trabecular bone. Twenty trabecular bone samples were scanned using a micro-computed tomography device, converted to voxelised FE meshes and subjected to 160 load cases each (to define a homogenised multiaxial yield surface which represents several possible strain combinations). Simulations were carried out using a parallel code developed in-house. The nonlinear algorithms included both geometrical and material nonlinearities. The study found that for tension-tension and compression-compression regimes in normal strain space, the yield strains have an isotropic behaviour. However, in the tension-compression quadrants, pure shear and combined normal-shear planes, the macroscopic strain norms at yield have a relatively large variation. Also, our treatment of clockwise and counter-clockwise shears as separate loading cases showed that the differences in these two directions cannot be ignored. A quadric yield surface, used to evaluate the goodness of fit, showed that an isotropic criterion adequately represents yield in strain space though errors with orthotropic and anisotropic criteria are slightly smaller. Consequently, although the isotropic yield surface presents itself as the most suitable assumption, it may not work well for all load cases. This work provides a comprehensive assessment of material symmetries of trabecular bone at the macroscale and describes in detail its macroscopic yield and its underlying microscopic mechanics.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the Mechanical Behavior of Biomedical Materials - Volume 61, August 2016, Pages 384-396
Journal: Journal of the Mechanical Behavior of Biomedical Materials - Volume 61, August 2016, Pages 384-396
نویسندگان
Francesc Levrero-Florencio, Lee Margetts, Erika Sales, Shuqiao Xie, Krishnagoud Manda, Pankaj Pankaj,