نوع مقاله : مقاله کامل پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد، دانشکده‌ی مهندسی مکانیک، دانشگاه تربیت مدرس، تهران، ایران

2 دانشیار، دانشکده‌ی مهندسی مکانیک، دانشگاه تربیت مدرس، تهران، ایران

10.22041/ijbme.2020.122037.1566

چکیده

با توجه به کاربرد آزمایش و تحلیل شکست استخوان در هر دو حوزه‌ی پزشکی و مهندسی، یافتن نمونه‌ی مناسب برای اندازه‌گیری خواص مکانیکی شکست بسیار مهم است. لذا در این مطالعه به تحلیل تجربی و عددی شکست استخوان کورتیکال گوساله برای 4 ناحیه‌ی آناتومیکی با استفاده از نمونه‌های کمان-شکل پرداخته شده است. تست تجربی شکست برای نمونه‏های کمان-شکل در دمای محیط انجام شده و در عمل فاکتور شدت تنش با استفاده از فرمول تحلیلی استاندارد برای نمونه‏های کمان-شکل و روش مدل المان محدود مربوط به نمونه‏ها محاسبه شده است. به منظور صحت‌سنجی مدل المان محدود، نتایج تحلیل تنش و کرنش با نتایج به دست آمده از روش برهم‏نگاری تصاویر دیجیتالی مقایسه شده است. توافق بسیار خوب بین نتایج تحلیل تنش و کرنش عددی و تجربی، نشان دهنده‌ی دقت تحلیل المان محدود است. در این مطالعه ارتباط خوبی در شروع و رشد ترک بین نتایج تجربی و المان محدود و هم‌چنین مقادیر چقرمگی شکست به دست آمده از روش عددی با دیگر مطالعات مشاهده شده است. هم‌چنین نتایج حاصل از این مطالعه نشان می‏دهد که فاکتور شدت تنش تحلیلی می‏تواند نتایج دقیقی برای نمونه‏های کمان-شکل ایجاد شده از نواحی آناتومیکی خلفی و قدامی ارائه کند، هرچند برای نواحی آناتومیکی میانی و جانبی، تنها مدل المان محدود می‏تواند دقت لازم را فراهم سازد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Determination of Fracture Properties of Cortical Bone using Arc-Shaped Specimen

نویسندگان [English]

  • Fereshteh Alizadeh Fard 1
  • Majid Mirzaei 2

1 M.Sc. Student, Department of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran

2 Associate Professor, Department of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran

چکیده [English]

Regarding the application of testing and analysis of bone fractures in both medical and engineering fields, finding proper specimens for measuring fracture properties is important. In this study, the experimental and numerical fracture analyses of bovine cortical bone were performed for 4 anatomical regions using arc-shaped specimens. The tensile fracture tests for arc-shaped specimens were performed at ambient temperature. In practice, the stress intensity factor was calculated using standard analytical formula for arc-shaped specimens and also the related finite element (FE) models. In order to validate the FE models, the stress and strain analyses results were compared with the results obtained from digital image correlation (DIC) method. The very good agreement between these results was indicative of the accuracy of FE analyses. There were also good correlations between the initiation and propagation of crack from both experimental and FE results and the measured fracture toughness values were in good agreement with those reported in the literature. The results of this study showed that the analytical stress intensity expressions can give accurate results for the arc-shaped specimens excised from posterior and anterior regions. However, for the medial and lateral regions only the FE models can provide the required accuracy.

کلیدواژه‌ها [English]

  • Cortical bone
  • finite element method
  • Arc-Shaped Specimen
  • Stress analysis
  • Digital Image Correlation
  • Fracture toughness
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