علوم و فناوری کامپوزیت

علوم و فناوری کامپوزیت

مقایسه رفتار خزشی در کامپوزیت‌های پایه پلیمری ترموست بر اساس دو مدل‌ ویسکوالاستیک انتگرال یگانه شپری و چهار پارامتری برگر

نوع مقاله : مقاله پژوهشی

نویسندگان
1 دانشجوی کارشناسی ارشد، مهندسی مکانیک، دانشگاه کاشان، کاشان .
2 استاد، مهندسی مکانیک، دانشگاه کاشان، کاشان.
10.22068/jstc.2025.2064251.1924
چکیده
در این تحقیق دو مدل تحلیلی ویسکوالاستیک چهار پارامتری برگر و انتگرال یگانه شپری برای پیش‌بینی رفتار خزشی بلند مدت چند لایه‌های کامپوزیتی شیشه/ وینیل استر مقایسه، تحلیل و ارزیابی شده است. برای مشخصه‌سازی پارامترهای معادله ویسکوالاستیک برگر از نتایج آزمایش‌های تجربی موجود، استفاده شد. از آنجا که استفاده از پارامترهای مشخصه‌سازی شده در مرحله خزش برای جایگذاری در معادله مربوط به ریکاوری، خطای زیادی را بین نتایج آزمون‌های تجربی و مدل تحلیلی ویسکوالاستیک برگر ایجاد کرد، پارامترهای مدل برگر در مرحله خزش و ریکاوری بصورت جداگانه مشخصه‌سازی شدند. نتایج بدست آمده از مدل ویسکوالاستیک برگر نسبت به مدل ویسکوالاستیک شپری برای چند لایه‌های کامپوزیتی شیشه/ وینیل استر، از انطباق بسیار خوبی با نتایج بدست آمده از آزمون‌های تجربی بخصوص در سطوح دمایی و تنشی بالا، برخوردار بود. این انطباق در هر دو مرحله خزش و ریکاوری بخوبی مشاهده گردید. همچنین اثر دما و تنش بر روی تغییرات پارامتر‌های معادله برگر بررسی شد و مشاهده گردید که مقادیر این پارامترها با تغییر سطوح دما و تنش تغییر می‌کند. در ادامه معادلات حاکم بر تغییرات این پارامترها نسبت به دما و تنش استخراج گردید. سپس پارامترهای نرمی خزشی، مدول خزشی، فاکتور تخریب و نرخ کرنش خزشی در هر مرحله محاسبه شد. نتایج نشان می‌دهد که با افزایش سطح دما و تنش، نرمی خزشی، فاکتور تخریب، و نرخ کرنش خزشی افزایش و مدول خزشی برای چند لایه‌های کامپوزیتی شیشه/ وینیل استر کاهش می‌یابد.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Creep Behaviour Comparison in Thermoset Polymer Matrix Composites Based on Single Integral Schapery and Four Parameter Burgers Models

نویسندگان English

Mohammad Hossein Ghappani Fard Kashani 1
Ahmad Reza Ghasemi 2
1 Department of Mechanical Engineering, University of Kashan, Kashan, Iran.
2 Department of Mechanical Engineering, University of Kashan, Kashan, Iran.
چکیده English

In this study two viscoelastic analytical models -the four-parameter Burgers model and the single-integral Schapery model- were compared, analyzed, and evaluated for predicting the long-term creep behavior of glass/vinylester composite laminates. The parameters of the Burgers viscoelastic model were characterized using available experimental data. Since using the same set of characterized parameters from the creep stage in the recovery stage resulted in significant discrepancies between experimental results and the Burgers analytical model, the model parameters for the creep and recovery stages were characterized separately. The results obtained from the Burgers model showed significantly better agreement with experimental data for glass/ vinylester composite laminates, especially at high temperature and stress levels, compared to the Schapery model. This agreement was observed clearly in both the creep and recovery stages. Furthermore, the effects of temperature and stress on the variations of the Burgers model parameters were investigated, revealing that these parameters change with varying temperature and stress levels. Subsequently, the governing equations describing the variation of these parameters with respect to temperature and stress were derived. Finally, the creep compliance, creep modulus, damage factor, and creep strain rate were calculated at each stage. The results for glass/ vinylester composite laminates indicate that with increasing temperature and stress levels, the creep compliance, damage factor, and creep strain rate increase, while the creep modulus decreases.

کلیدواژه‌ها English

Creep
Schepery viscoelastic model
Burgers four-parameter viscoelastic model
Long-term creep behavior
Composite multi-layers
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