بررسی چقرمگی شکست مود یک بین لایه‌ای در ورق‌های کامپوزیتی موج‌دار

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده مهندسی مکانیک، دانشگاه صنعتی کرمانشاه، کرمانشاه، ایران.

چکیده

در این پژوهش جدایش بین لایه‌ای ورق‌های کامپوزیتی موجدار ساخته شده از الیاف شیشه تک جهته و رزین پلی‌استر مورد بررسی قرار گرفته است. نمونه‌ها با فرآیند لایه چینی دستی و مطابق با استاندارد  ساخته شده  و با استفاده از تست‌های آزمایشگاهی، نرخ انرژی کرنشی آزاد شده در مود یک با روش‌های رایج در زمینه شکست بین لایه‌ای، برای نمونه‌های موج دار کامپوزیتی محاسبه شده است. همچنین به کمک نرم افزار آباکوس و با خواص مکانیکی الیاف تک جهته شیشه/پلی استر، شبیه سازی نمونه‌ها بعنوان تیر یکسرگیردار دولبه انجام شده و نتایج حل عددی نیز بدست آمده است. سطوح شکست نمونه‌های آزمایشگاهی با میکروسکوپ الکترونی روبشی تحلیل و بررسی شده‌ است و نمودارهای نیرو‌جابه‌جایی حاصل از تست‌های آزمایشگاهی و شبیه سازی‌های عددی جهت بررسی رفتار ماده و محاسبه نرخ انرژی کرنشی آزاد شده برای نمونه‌های مختلف با سه طول پیش ترک ایجاد شده مورد مقایسه قرارگرفته است. نتایج نشان می‌دهد که ورق‌های موجدار در مقایسه با ورق‌های تخت، از مقاومت به رشد ترک بالاتر، نرخ انرژی کرنشی آزاد شده و چقرمگی شکست بین لایه‌ای بیشتری برخوردارند و نمونه چهار موج در طول ترک 60 و 65 میلیمتر دارای بالاترین مقدار نرخ انرژی کرنشی آزاد شده به ترتیب برابر 963/77 و705/95 ژول بر متر مربع می‌باشد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Investigation of Interlaminar Mode-I Fracture Toughness of Corrugated Composite Plates

نویسندگان [English]

  • Sayed Amir Safipour
  • Mahmood Heshmati
Department of Mechanical Engineering, Kermanshah University of Technology, Kermanshah, Iran
چکیده [English]

In this study, delamination of the corrugated composite plates made of unidirectional glass fibers and polyester resin has been investigated. The samples are fabricated by hand lay-up process based on the ASTM-D5528 standard. Using experimental tests, the strain energy release rate in mode I has been calculated for composite corrugated specimens by the prevalent method of interlaminar failure. Also, the samples were simulated as a double cantilever beam by Abaqus software, and the mechanical properties of unidirectional glass/polyester composite and the results of the numerical solution are also obtained. Fracture surfaces of experimental samples were analyzed by scanning electron microscope. Force-displacement curves obtained from experimental and numerical methods have been compared to find the material behavior and calculate the strain energy release rate for different samples with three pre-crack lengths. The results show that the corrugated composite plates have a higher interlaminar fracture toughness rather than flat samples and the four-wave sample with a crack length of 60 and 65 mm has the highest values of the strain energy rate released, equal to 963.77  J/m2 and 705.95  J/m2, respectively.

کلیدواژه‌ها [English]

  • Corrugated composite plates
  • Delamination
  • Fracture toughness
  • Strain energy
  • Failure mode I
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