تعیین پاسخ خستگی تیر مدور کامپوزیتی با به‌کارگیری یک مدل نوین آسیب کوپلی پیشرو

نوع مقاله: مقاله پژوهشی

نویسنده

عضو هیات علمی / مجتمع دانشگاهی هوافضا، دانشگاه صنعتی مالک اشتر

چکیده

محاسبات مربوط­به پاسخ خستگی ساختارهای کامپوزیتی، از طرفی با چالش وجود مدل­های نه­چندان کارآمد و از طرف دیگر با هزینه­های گزاف در اجرای آزمایشات متعدد با پیچیدگی‌های عملی و نیاز به تجهیزات پیشرفته و دقیق مواجه ­است. از این ­منظر، توسعه و تکامل هرچه­ بیشتر مدل­ها در تعیین پاسخ خستگی المان­ها و سازه­ها بسیار ارزشمند است. در این مقاله، ضمن ارائة مدل­ کوپلی نوین آسیب از ارزیابی خستگی، پاسخ خستگی تیر مدور کامپوزیتی مشخصه­سازی شده ­است. با تعریف یک متغیر آسیب سیکلی تابع مکان، رابطة پاسخ مکانیکی با متغیر آسیب از طریق مدل مکانیک آسیب پیوسته تعیین شده ­است. در ادامه از طریق کوپل‌نمودن متغیر آسیب با یک مدل آسیب ­موضعی و تئوری اصلاح‌شدة تیر مدور با ترم­های غیرخطی، محاسبة پیشرفت موضعی آسیب با هر سیکل بارگذاری هر نقطه از تیر میسر شده ­است. مقادیر ثابت معرفی­شده در روابط مدل، از طریق انجام تعداد بسیار معدودی آزمایش تحت بارگذاری­های نوسانی دامنة ثابت تا تعداد محدودی سیکل به‌دست آمده ­است. نتایج ­نهایی حاصل از طریق محاسبات ­مدل، تطابق رضایت­بخشی با نتایج تجربی نشان می­دهد. در نتیجه کارآمدی فرایند ارائه‌شده، کاهش قابل ملاحظة تعداد آزمایشات مورد نیاز و در نهایت کاهش هزینه و زمان لازم میسر شده ­است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Determination of fatigue response of composite circular beam through a new coupled progressive fatigue damage model

نویسنده [English]

  • Mahmood Zabihpoor
Assistant Professor, Malek Ashtar University of technology, Tehran
چکیده [English]

Fatigue behavior of fiber reinforced composites is still difficult to analyze or understand to be determined. It is due to various parameters affecting and their complicated interactions which come from the constituents’ physical and mechanical behavior. Hence, conducting experiments and developing fatigue models are necessary in determination of fatigue behavior in many cases. On the other hand, complicated behaviors lead the application of composite materials to be accomplished with a number of experiments and/or including high safety factors in design calculations in both the process may not be cost effective. This paper introduces a new algorithm and model to determine fatigue response of damaged circular composite beam. The results are evaluated by experimental results. By using the proposed model, the number of experiments and the time needed to determine fatigue behavior of damaged circular beams are significantly reduced. To determine the constants introduced in the local fatigue damage model, cyclic tests are performed up to limited load cycles. The predicted results by the model and obtained from the experiments represent satisfactorily good agreements.

کلیدواژه‌ها [English]

  • fatigue
  • circular composite beam (CCB)
  • continuum damage mechanics (CDM)
  • beam stiffness
  • local damage model

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