مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

شبیه سازی توزیع دمای سینترینگ زیرکونیا با تابش لیزر سینوسی توسط مدل غیرفوریه DPL

نوع مقاله : مقاله پژوهشی

نویسندگان
1 گروه مهندسی مکانیک، واحد لاهیجان ، دانشگاه آزاد اسلامی ، لاهیجان ، ایران
2 گروه مهندسی مکانیک، واحد فومن ، دانشگاه آزاد اسلامی ، فومن ، ایران
10.48311/mme.2026.121101.83037
چکیده
در این پژوهش به جهت بکارگیری تابع لیزر در فرآبند سینترینگ زیرکونیا، مدل سازی عددی تابش لیزر با تابع مدولاسیون سینوسی توسط مدل غیرفوریه با تاخیر فاز دوگانه شبیه سازی شده است. تابع تعریف شده برای این لیزر به گونه ای است که شار حرارتی تابش در محدوده مقادیر 2 کیلو وات بر سانتی متر مربع باشد ولی این شدت تابش لیزر بصورت پالسی و با ایجاد فرصت آسایش حرارتی به روکش دندان بر آن تابیده می‌شود. توزیع مکانی پرتوهای لیزر گاوسی و شعاع پرتو 2 میلی متر است. حل معادلات به وسیله تقریب تفاضلات محدود توسط نرم افزار متلب انجام شده است. به منظور تحلیل فرآیند سینترینگ روکش زیرکونیا، هندسه‌ای از روکش دندان با ابعاد واقعی مورد مطالعه قرار می‌گیرد. توسط روش نگاشت مختصاتی، هندسه مسئله با تمام پیچیدگی‌های آن شبکه بندی خواهد شد. در این پژوهش نتایج شبیه‌سازی نشان داد که در فرآیند سینترینگ با تابع لیزر سینوسی، دما در مدت حدود 140 دقیقه از دمای محیط به ۱۶۰۰ درجه افزایش پیدا می کند و سپس خنک شدن روکش نیز سریع و با شیب نمایی اتفاق می‌افتد. سینترینگ سریع با لیزر به دلیل امکان افزایش سریع دما و کاهش زمان کلی فرایند، گزینه‌ای جذاب خواهد بود، ولی ممکن است باعث ایجاد گرادیان دمایی شدید شود. اهمیت موضوع افزایش دما در زمان بسیار کوتاه حدودا 3 ساعت نسبت به فرآیندهای عادی با مدت زمان 10 ساعت، در کاهش زمان تولید و افزایش بهره‌وری است.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Simulation of temperature distribution of zirconia sintering with sinusoidal laser radiation using non-Fourier model DPL

نویسندگان English

mohammad ahmadi syahkolorodi 1
shahram falahatkar 2
mehdi borji badaghi 1
javad rezapour 1
1 Department of technical Engineering, La.C. , Islamic Azad University, Lahijan, Iran
2 Department of Technical Engineering, Fsh.C., Islamic Azad University, Fouman, Iran
چکیده English

In this study, to incorporate the laser function into the zirconia sintering process, the numerical modeling of laser irradiation employing a sinusoidal modulation function was simulated using a non-Fourier, dual-phase-lag model. The defined laser function ensures the irradiation heat flux remains within the range of 2 kW/cm², while the intensity is delivered in a pulsed manner, allowing for thermal relaxation intervals within the dental veneer. The laser beam exhibits a Gaussian spatial distribution with a beam radius of 2 mm. The equations were solved using the finite difference approximation method in MATLAB. To analyze the sintering process of a zirconia dental coping, a geometry based on actual dimensions was examined. A coordinate mapping technique was employed to generate a mesh for the geometry, accounting for all its complexities. Simulation results indicated that during the sintering process using a sinusoidal laser function, the temperature rises from ambient levels to 1600°C over approximately 140 minutes, followed by rapid cooling of the coping at an exponential rate. While rapid laser sintering is an attractive option due to the ability to raise temperatures quickly and reduce total processing time, it may induce steep temperature gradients. The significance of raising the temperature over a very short period approximately 3 hours, compared to the 10 hours required for standard processes lies in the reduction of production time and the increase in productivity.

کلیدواژه‌ها English

sinusoidal Laser
non-Fourier equations
sintering furnace
zirconia
coordinate mapping
finite differences
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