مدل‌سازی فرایند فراصوت لیزری در رژیم دما-ارتجاعی به‌روش اجزای محدود

علوم کاربردی و محاسباتی در مکانیک

مقاله 8، دوره 32، شماره 1 - شماره پیاپی 23، 1399، صفحه 133-152   

نوع مقاله: مقاله پژوهشی

شناسه دیجیتال (DOI): 10.22067/jacsm.2021.56657.0

نویسندگان

سلمان شمسایی؛ فرهنگ هنرور^*

دانشکدۀ مهندسی مکانیک، دانشگاه صنعتی خواجه نصیرالدین طوسی، تهران، ایران

چکیده

دراینمقاله،انتشارامواجفراصوتیحاصلازتابشپرتولیزربهسطحیکجسمجامددررژ‌یمدما-ارتجاعی  وتاآستانۀتبخیرمادهبااستفادهازحل‌کنندهکد-استر(Code-Aster) به‌صورتدوبعدیمدل‌سازیشده است. برخلاف مطالعات پیشین، مسئلۀ فراصوت لیزری در دو مرحله و با مش‌ها و گام‌های زمانی متفاوت و مورد نیاز هر یک از بخش‌های تحلیل‌حرارتی و مکانیکی حل شده است که این امر باعث کاهش چشمگیری در زمان محاسباتشده است. انتشار امواج فراصوتی حاصل از تابش لیزر Nd:YAG با طول موج ۵۳۲ نانومتر، خیز پالس 5 نانوثانیه و شدت لیزر حداکثر 10 میلی‌ژول به‌صورت تابعی از زمان در کل قطعه محاسبه شده و موج‌های طولی و عرضی حاصل و نیز رفتار حرارتی ماده در اثر تابش پرتو بررسی شده است. زمان انجام محاسبات برای تحلیل‌های مجزای حرارتی و مکانیکی روی رایانه‌ای که برای این کار استفاده شد، جمعاً یکساعت و 55دقیقه بوده است؛ درحالی‌که در تحلیل هم‌زمان، محاسبات حداقل 11ساعت و 29دقیقه طول می‌کشد. نتایج به‌دست‌آمدهباداده‌هایآزمایشگاهیوعددیسایرمحققانمقایسهشدهاست. تطابقخوبنتایج،درستیمدل‌سازیراتأیید می‌کند و نشان می‌دهد که کد موجود،رفتار حرارتی و مکانیکی فراصوت لیزری را به‌درستی و با سرعتی بیشتر از روش‌های پیشین محاسبه کرده است.

کلیدواژه‌ها

لیزر؛ فراصوت؛ اجزای محدود؛ کد-استر؛ ارزیابی غیرمخرب

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