پیش‌بینی عمر خستگی پرچرخه تحت بارگذاری دامنه متغیر با استفاده از روش ترموگرافی

علوم کاربردی و محاسباتی در مکانیک

مقاله 5، دوره 36، شماره 2 - شماره پیاپی 36، مرداد 1403، صفحه 59-76   

نوع مقاله: مقاله پژوهشی

شناسه دیجیتال (DOI): 10.22067/jacsm.2023.83002.1189

نویسندگان

محمد کشت گر؛ محمود شریعتی^* ؛ خلیل فرهنگدوست

دانشکده مهندسی، گروه مهندسی مکانیک، دانشگاه فردوسی، مشهد، ایران.

چکیده

در این مقاله عمر فلزات تحت بارگذاری خستگی با دامنه متغیر مورد بررسی قرار گرفته است. به همین منظور از روش مکانیک آسیب پیوسته برای مدل‌سازی پارامتر آسیب بهره گرفته شده که در آن میزان انرژی اتلافی در هر سیکل در واحد حجم به‌عنوان شاخص آسیب شناخته می‌شود. مدل آسیب معرفی‌شده در این مقاله توانایی استفاده در مسائل با دامنه متغیر را دارد، به همین دلیل در این مطالعه یک نمونه از جنس فولاد Q235، در نرم‌افزار آباکوس شبیه‌سازی و از دو سابروتین UMAT و UMATHT برای استخراج هم‌زمان انرژی اتلافی در هر سیکل و دما مربوط به آن استفاده شده‌است. به‌منظور بررسی عمر خستگی تحت بارگذاری دامنه متغیر، دو بلوک بارگذاری با دامنه‌های مختلف در نظر گرفته شده‌است. حالات مختلفی برای این دو بلوک بارگذاری در نظر گرفته شده‌است که نتایج آنها نشان می‌دهد مدل آسیب معرفی‌شده حساسیت بالایی نسبت به تاریخچه و توالی بارگذاری دارد؛ هم‌چنین مطابقت خوبی بین نتایج این پژوهش و نتایج آزمایشگاهی وجود دارد.

کلیدواژه‌ها

عمر خستگی پرچرخه؛ روش مکانیک آسیب؛ شاخص آسیب؛ میزان انرژی اتلافی در هر سیکل؛ ترموگرافی

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