نوع مقاله: مقاله پژوهشی

نویسندگان

1 استادیار، دانشکده مهندسی مکانیک،دانشگاه علم و صنعت ایران ،تهران، ایران

2 دانشجوی کارشناسی ارشد، دانشکده مهندسی مکانیک، دانشگاه علم و صنعت ایران ، تهران، ایران

3 دانشیار، دانشکده مهندسی مکانیک، دانشگاه علم و صنعت ایران، تهران ، ایران

چکیده

کامپوزیت‌ها به‌دلیل وجود مکانیزم‌های مختلف آسیب و تفاوت در رشد و تأثیر این مکانیزم‌ها بر یکدیگر، نسبت به فلزات دارای پیچیدگی بیشتری می‌باشد. در این تحقیق یک مدل مبتنی بر مکانیک خرابی محیط‌های پیوسته برای پیش بینی عمر چندلایه‌های متعامد متقارن کامپوزیتی تحت بارگذاری خستگی ارائه شده است. ثوابت الاستیک ماده بر پایه روش مایکرومکانیکی برحسب ثوابت الاستیک الیاف و رزین به‌دست می‌آیند. در مدل ارائه شده بر پایه مکانیک خرابی محیط‌های پیوسته دو متغیر آسیب الیاف و رزین معرفی شده به بررسی افت سفتی در سطح یک لایه می‌پردازند، به‌همین دلیل مدل ارائه شده مستقل از لایه‌چینی قادر به پیش‌بینی سفتی باقیمانده و عمر چندلایه‌های متعامد کامپوزیتی تحت وضعیت‌ها و نسبت‌های مختلف تنش خواهد بود. ثوابت مادی مدل ارائه شده با استفاده از تست‌های خستگی کشش-کشش روی تک‌لایه‌ قابل تعیین می‌باشد. نمودار افت سفتی پیش‌بینی شده توسط مدل ارائه شده با نتایج حاصل از آزمایش‌های موجود در مراجع روی تک‌لایه‌ها مقایسه شده است. همچنین اعتبار سنجی مدل بر پایه آزمایشات موجود روی چندلایه متعامد صورت گرفته که نتایج حاصل شده دارای دقت مناسبی هستند.

کلیدواژه‌ها

عنوان مقاله [English]

Fatigue life prediction of symmetric cross ply laminated composite using a developed continuum damage mechanics based model

نویسندگان [English]

  • Bijan Mohammadi 1
  • Babak Fazlali 2
  • Reza Madoliat 3

1 Department of Mechanical Engineering, University of Science and Technology, Tehran, Iran

2 Department of Mechanical Engineering, University of Science and Technology, Tehran

3 Department of Mechanical Engineering, University of Science and Technology, Tehran, Iran

چکیده [English]

Composite materials behavior is complicated more than metallic material because of different mechanisms of damage, damage growth rate and effect of them in each other. In this paper, a continuum damage mechanic based model is proposed to predict the fatigue life of symmetric cross ply laminated composites under fatigue loading. According to fiber and matrix elastic properties, Elastic material constants of lamina are defined base on micromechanical approach. Two damage variable of matrix and fiber direction are considered to explain stiffness degradation on the scale of the plies, which thus makes it possible to use in any stacking sequences of cross ply laminated composites. Also, it is capable to predicted fatigue life and residual stiffness of laminates under different states of stress and stress ratio. The available tension-tension fatigue tests on 0◦ and 90◦ unidirectional laminates are used to identify material parameters of damage evolution equations in matrix and fiber direction. Finally, the stiffness degradation and final failure cycle of laminates during the fatigue loading on unidirectional plies and cross-ply layups are compared with available experiments. The obtained results are show a good agreement with the experiments.

کلیدواژه‌ها [English]

  • fatigue
  • Continuum damage mechanics
  • Fiber
  • Matrix

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