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تحلیل عددی شریان کرونری استنت گذاری شده: بررسی عملکرد دو استنت با جنس های منیزیمی و فولادی | ||
| نشریه مهندسی مکانیک امیرکبیر | ||
| مقاله 20، دوره 52، شماره 4، تیر 1399، صفحه 1055-1076 اصل مقاله (3.14 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22060/mej.2018.13282.5601 | ||
| نویسندگان | ||
| یاسین تقی زاده1؛ بهمن وحیدی* 2؛ بابک اکبری2؛ شیما جلالیان صداقتی1 | ||
| 1دانشجو/دانشگاه تهران | ||
| 2استادیار/دانشگاه تهران | ||
| چکیده | ||
| سازه‌های کامپوزیتی مشبک به دلیل خواص منحصر بفردشان، یکی از سازه‌های پرکاربرد در صنایع هوایی، دریایی و خودروسازی می‌باشند. در دهه‌های اخیر تحقیقات زیادی برای پیش‌بینی بار بحرانی کمانش سازه‌های کامپوزیتی، بدون خرابی یا شکست انجام شده است. یکی از مهم‌ترین روش‌های غیرمخرب، روش همبستگی ارتعاشی می‌باشد. هدف تحقیق حاضر پیش‌بینی بار بحرانی کمانش ورق‌های کامپوزیتی تقویت شده با استفاده از روش همبستگی ارتعاشی می‌باشد. برای این منظور در ابتدا تحلیل ارتعاشات غیرخطی ورق‌های کامپوزیتی تقویت شده با استفاده از نرم‌افزار المان محدود آباکوس و در بارهای فشاری مختلف انجام شد. در مرحله‌ی بعد با استفاده از نتایج عددی و روش همبستگی ارتعاشی، بار بحرانی کمانش سازه مذکور پیش‌بینی گردید. در ادامه و برای صحت سنجی نتایج روش همبستگی ارتعاشی، سه ورق تقویت شده کامپوزیتی مشابه و با شرایط یکسان و با استفاده از روش با روش رشته پیچی و لایه چینی دستی ساخته شد و تحت آزمون فشار محوری قرار داده شد. در نهایت بار بحرانی کمانش تجربی به دست آمد. نتایج نشان می‌دهد که اختلاف بار بحرانی کمانش پیش‌بینی شده به روش همبستگی ارتعاشی با بار بحرانی کمانش به دست آمده از آزمایش تجربی کمتر از 5 درصد می‌باشد که این موضوع دال بر مناسب بودن روش همبستگی ارتعاشی برای پیش‌بینی بار بحرانی کمانش با دقت بسیار بالا برای ورق‌های کامپوزیتی تقویت شده می‌باشد. | ||
| کلیدواژه‌ها | ||
| وراتروسکلروسیس؛ کاشت استنت؛ گرفتگی مجدد؛ درصد کاهش طول؛ برگشت‌پذیری | ||
| عنوان مقاله [English] | ||
| Numerical Analysis of a Stented Coronary Artery: Investigating Function of Two Stents with Magnesium and Stainless Steel Materials | ||
| نویسندگان [English] | ||
| Yasin Taghizadeh1؛ Bahman Vahidi2؛ Babak Akbari2؛ Shima Jalalian Sedaghati1 | ||
| 1MSc/University of Tehran | ||
| چکیده [English] | ||
| Recently, the use of coronary stents in interventional procedures has rapidly increased. Biodegradable magnesium alloy stents gained increasing interest in the past years due to their potential prospects. However, for the magnesium alloy stents to be feasible for widespread clinical use, it is important that their performance can be compared to modern permanent stents. In this research, a finite element method is used for investigating the effect of the stent geometry and material properties on its behavior. The stent designs made with two different materials, stainless steel 304 and magnesium alloy AZ 31, and the Palmaz-Schatz geometry are modeled and their behavior during the deployment is compared in terms of stress distribution in the stent, vessel wall, plaque as well as in terms of outer diameter changes, radial recoil ratio, axial recoil ratio, and Foreshortening. Moreover, the effect of stent material properties on the restenosis after coronary stent placement is investigated by comparing the stress distribution in the arteries. According to the findings, the possibility of restenosis after coronary stenting is lower for magnesium alloy stents in comparison with the stainless steel 304 stent. | ||
| کلیدواژه‌ها [English] | ||
| Atherosclerosis, Stent implantation, Restenosis, Foreshortening, Recoil | ||
| مراجع | ||
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