پیش‌بینی شکست چندلایه‌های کامپوزیتی تحت خمش توسط مدل‌ دسته ترک و معیار هشین

علوم کاربردی و محاسباتی در مکانیک

مقاله 2، دوره 37، شماره 2 - شماره پیاپی 40، خرداد 1404، صفحه 13-28   

نوع مقاله: مقاله پژوهشی

شناسه دیجیتال (DOI): 10.22067/jacsm.2024.81229.1169

نویسندگان

علیرضا نظری^{* 1}؛ مهدی خانزاده-مرادلو²

¹دانشکده مهندسی عمران، دانشگاه فنی و حرفه ای، تهران، ایران

²گروه مهندسی عمران‌ و محیط‌زیست، دانشگاه تمپل، فیلادلفیا، آمریکا

چکیده

برای ارزیابی مقاومت نهایی در چندلایه‌های کامپوزیتی پایه پلیمری معیارهای مختلفی پیشنهاد شده، حال آنکه شکست ترد در این مواد کمتر برررسی شده است. در مقاله حاضر چندلایه‌های ساخته شده با الیاف تک‌جهته شیشه و رزین وینیل‌استر تحت بارگذاری سه نقطه خمشی در آزمایشگاه قرار گرفته و کاهش سختی وابسته به گسترش ترک‌خوردگی در ماتریس و خرابی نهایی وابسته به شکست ترد لایه‌ها بصورت گروهی ملاحظه شد. در ادامه مدل‌های المان محدود از نمونه‌های آزمایشگاهی شبیه‌سازی شده و با مقایسه نتایج مدل‌ها با نتایج آزمایشگاهی، مدل پیشنهادی برای خرابی مورد تصدیق قرار گرفت. پیش‌بینی کاهش سختی چندلایه‌ها بعلت آسیب پیش‌رونده ماتریس بر مبنای میزان انرژی جذب‌شده و شکست ترد نهایی بر مبنای مدل دسته‌ترک که ایده جدید تحقیق حاضر بوده، دارای دقت خوبی در مقایسه با نتایج آزمایشگاهی بود حال آنکه پیش بینی خرابی توسط معیار تنش بیشینه در مورد تیرهای همراستا با الیاف و عمود بر راستای الیاف به ترتیب با 29% و 50% خطا نسبت به مقادیر آزمایشگاهی بود.

کلیدواژه‌ها

چندلایه‌های کامپوزیتی؛ مدل دسته ترک؛ معیار خرابی هشین؛ انرژی جذب‌شده؛ آسیب پیش‌رونده

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