An experimental investigation of delamination effect on the modal parametersof a composite cylinder
محل انتشار: کنفرانس دو سالانه بین المللی مکانیک جامدات تجربی
سال انتشار: 1392
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 986
فایل این مقاله در 8 صفحه با فرمت PDF قابل دریافت می باشد
- صدور گواهی نمایه سازی
- من نویسنده این مقاله هستم
استخراج به نرم افزارهای پژوهشی:
شناسه ملی سند علمی:
WMECH02_110
تاریخ نمایه سازی: 21 تیر 1393
چکیده مقاله:
Applications of composite cylinders have been widely expanded in recent years. However, delamination which is a common defect in composite materials often propagates because of loading condition especially in vibrational environments or under impact loads. These kinds of damages should be taken under consideration due to avoid life design reduction or catastrophic failures. This paper presents an experimental low frequency investigation on the modal behavior of a delaminated filament wounded Glass/Epoxy cylinder. In order to show the delamination effect on modal parameters, the modal parameters of defected cylinder is compared with the reference state, i.e. healthy cylinder. The surface delamination is created in a healthy cylinder by low velocity impact loads and extended in four stages. Experimental modal analysis is implemented for each stage in order to indicate presence of the delamination. An experimental setup with free-free boundary condition is established with which composite cylinder is excited by a modal hammer while response is measured by a piezoelectric accelerometer. The comparison of natural frequencies, modal assurance criterion (MAC) and modal damping coefficients is illustrated between healthy and defected state of the cylinder for first eight modes. It is observed that damping ratios are more sensitive with respect to either natural frequencies or mode shapes. Moreover, it is revealed that the percentage of modal damping variation is higher in the first modes for small damage and lower in the first modes for bigger damages.
کلیدواژه ها:
نویسندگان
H Soleimani
MSc Student
A. S Nobari
Professor
H Shahverdi
Assitant Professor
J. E Jam
Professor Vibration and Dynamic Systems Research Laboratory, Department of Aerospace Engineering, Amirkabir University of Technology, Hafez Avenue, ۱۹۸۷۵۴۴۱۳, Tehran, Iran,
مراجع و منابع این مقاله:
لیست زیر مراجع و منابع استفاده شده در این مقاله را نمایش می دهد. این مراجع به صورت کاملا ماشینی و بر اساس هوش مصنوعی استخراج شده اند و لذا ممکن است دارای اشکالاتی باشند که به مرور زمان دقت استخراج این محتوا افزایش می یابد. مراجعی که مقالات مربوط به آنها در سیویلیکا نمایه شده و پیدا شده اند، به خود مقاله لینک شده اند :