پژوهشنامه حمل و نقل

پژوهشنامه حمل و نقل

شبیه‌سازی رفتار ترک‌خوردگی مخلوط آسفالتی با بکارگیری مدلسازی غیرهمگن مبتنی بر الگوریتم تولید و توزیع تصادفی سنگدانه‌ها

نوع مقاله : مقاله پژوهشی

نویسندگان
مجید جبالبارزی 1
حسن زیاری 2
1 استادیار، گروه مهندسی عمران، دانشکده فنی ومهندسی‌، دانشگاه جیرفت‌، جیرفت، ایران
2 استاد، گروه راه و ترابری، دانشکده مهندسی عمران، دانشگاه علم و صنعت ایران، تهران، ایران
10.22034/tri.2023.368379.3100
چکیده
مخلوط آسفالتی یک ماده کامپوزیت ومتشکل از فضای خالی، قیر و سنگدانه می‌باشد. خواص مکانیکی هر یک از این اجزا بر رفتار ترک‌خوردگی مخلوط آسفالتی تاثیر می‌گذارند. در این تحقیق سعی شده تا با استفاده از مدلسازی غیرهمگن رفتار ترک‌خوردگی مخلوط آسفالتی بررسی گردد. بدین منظور ابتدا با استفاده از الگوریتم تولید و توزیع تصادفی سنگدانه‌ها، نمونه‌های عددی ایجاد می‌گردند. سپس، با بکارگیری روش المان محدود، تاثیر عوامل مختلف از جمله مدول الاستیسیته سنگدانه‌ها و ماستیک، نسبت پواسون سنگدانه‌ها و ماستیک، توزیع سنگدانه‌ها؛ شکل سنگدانه‌ها، فضای خالی و موقعیت نوک ترک بر ضرایب شدت تنش بررسی می‌گردند. نتایج نشان می‌دهند ضرایب شدت تنش بدست آمده از مدلسازی غیرهمگن به مقدار قابل توجهی با ضرایب شدت تنش بدست آمده از مدلسازی همگن متفاوت می‌باشند. هنگامیکه نوک ترک درون سنگدانه‌ها می‌باشد، ضرایب شدت تنش بدست آمده از مدلسازی غیرهمگن بیشتر از ضرایب شدت تنش بدست آمده از مدلسازی همگن می‌باشند. درحالیکه اگر نوک ترک درون ماستیک باشد، مقادیر ضرایب شدت تنش بدست آمده از مدلسازی همگن بیشتر می‌باشند. همچنین نتایج نشان می‌دهد که موقعیت نوک ترک، مدول الاستیسیته ماستیک و سنگدانه‌ها تاثیر بسزایی بر ضرایب شدت تنش دارند. علاوه بر این مسیر رشد ترک با استفاده از معیار حداکثر تنش کششی پیش‌بینی گردید. براساس نتایج مسیر کلی رشد ترک برای نمونه‌های همگن و غیرهمگن یکسان می‌باشد. در صورتیکه به صورت محلی، مسیر رشد ترک متفاوت می‌باشد.
کلیدواژه‌ها
غیرهمگن
الگوریتم تولید و توزیع تصادفی سنگدانه‌ها
مسیر رشد ترک
ضرایب شدت تنش
تاثیر خواص مکانیکی

موضوعات

عنوان مقاله English

Simulating the Cracking Growth Behavior of Asphalt Mixture Using Heterogeneous Modeling Based on the Generation and Packing Algorithm

نویسندگان English

Majid Jebalbarezi 1
Hassan Ziari 2
1 Assistant Professor, Department of Civil Engineering,‌ University of Jiroft, Jiroft, Iran.
2 Professor, School of Civil Engineering, Iran University of Science and Technology (IUST), Tehran, Iran.
چکیده English

Asphalt mixture is a composite material which contains aggregates, binder, and air voids. The mechanical properties of these subsets affect the cracking growth behavior of asphalt mixture. In the present paper, heterogeneous modeling is used to study cracking growth behavior of asphalt mixture. To reach this goal, at first, numerical samples were created using the aggregate generation and packing algorithm. Then, these samples were simulated using finite element software and the effect of elastic modulus and Poisson’s ratios of both aggregates and mastic parts, , shape and distribution pattern of aggregates, crack tip location, and air void distribution on stress intensity factors were evaluated. It was observed that stress intensity factors obtained from heterogeneous modeling are completely different in comparison with those of homogeneous modeling. When the crack tip was located inside the aggregates, stress intensity factor was greater than those obtained from homogeneous model. On the other hand, if the crack tip was located inside the mastic part, the stress intensity factors was smaller than the homogeneous SCB model. Moreover, the results showed that the crack tip location and elastic modulus of aggregates and mastic parts had significant effects on the magnitude and sign of stress intensity factors. Further, the crack growth path was predicted using the maximum tensile stress criterion. It was observed the aggregates could change the crack growth path locally; however, the general direction of crack growth in heterogeneous and homogeneous modeling was the same.

کلیدواژه‌ها English

Heterogeneous
Aggregate Generation and Packing Algorithm
Crack Trajectory
Stress Intensity Factors
Mechanical Property Effects
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