1PhD Student, Mechanical Engineering, School of Mechanical Engineering, Iran University of Science and Technology
2Assistance Professor, Mechanical Engineering, School of Mechanical Engineering, Iran University of Science and Technology
Abstract
In this paper, effects of ply orientation of adjacent plies with (ϕ//θ) interfaces on mode II critical strain energy release rate (fracture toughness) of multidirectional (MD) laminate has been studied. Ply orientation of adjacent plies is one of the most important parameters affects the mode II critical strain energy release rate () in the initiation of the delamination. To study this parameter, End Notch Flexure (ENF) specimen has been used for measuring of laminated composites. Eventually, the purpose is to predict of of MD composite specimen, without direct experimental tests and finite element modeling using the results of unidirectional (UD) ply. First, of unidirectional composites will be studied and by the results obtained, the behavior of multidirectional laminated composites is predicted. In this context, a comprehensive method was proposed that combines prediction methods, and analytical modeling. The obtainedof multidirectional laminated composites with (ϕ//θ) interfaces can be used for design purposes. Results obtained using this method has been compared with the results of numerical and theoretical methods. This prediction method reduces the calculation costs of FE and analytical models, and also the costs of experiments significantly.
پیش‌بینی مود II نرخ رهایی انرژی کرنشی در کامپوزیت‌های چند لایه‌ای چند جهته
Abstract [Persian]
جهت‌گیری الیاف یکی از مهم‌ترین پارامترهای مؤثر بر مود دوم نرخ رهایی انرژی کرنشی در شروع جدایش بین‌لایه‌ای است. از تیری با شکاف انتهایی برای اندازه‌گیری نرخ رهایی انرژی کرنشی در شروع جدایش بین‌لایه‌ای کامپوزیت‌های لایه‌ای استفاده شده است. در واقع هدف از این تحقیق، پیش‌بینی مقدار نرخ رهایی انرژی کرنشی نمونهی چندجهته از روی نتایج تجربی مربوط به قطعهی تک‌جهته می‌باشد، بدون اینکه مستقیماً به آزمایش‌های تجربی و مدل‌سازی اجزاء محدود قطعهی کامپوزیتی لایه‌ای چندجهته نیاز شود. در این زمینه، روشی پیشنهاد شده که ترکیبی از روش‌های پیش‌بینی و تحلیلی است. ضمناً نتایج بدست آمده از این روش با نتایج مدل‌سازی عددی و نتایج تحلیلی مقایسه شده است. این روش، حجم محاسبات عددی و تحلیلی و نیز هزینهی مطالعات آزمایشگاهی را به مقدار چشم‌گیری کاهش میدهد
Keywords [Persian]
شروع جدایش بین‌لایه‌ای، کامپوزیت، مود دوم، نرخ رهایی انرژی کرنشی
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