مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

استفاده از آزمون نشرآوایی برای مطالعه تاثیر ابعاد و لایه چینی بر رفتار مواد کامپوزیتی شیشه/اپوکسی تحت ضربه سرعت پایین

نوع مقاله : پژوهشی اصیل

نویسندگان
1 دانشکده مهندسی مکانیک، دانشگاه تبریز، تبریز، ایران
2 دانشگاه تبریز، تبریز، ایران
3 دانشکدۀ هوافضا، دانشگاه گلاسکو، گلاسکو، اسکاتلند
چکیده
سازه­های کامپوزیتی تحت بارگذاری ضربه مستعد انواع مکانیزم­های خرابی از قبیل جدایش بین لایه­ای، شکست الیاف و یا ترک ماتریس می­باشند. مطاعات نشان می­دهد که خرابی سازه­های کامپوزیتی در اثر ضربه وابسته به ابعاد (درون صفحه‌‌ای و بین صفحه‌‌ای) و چینش لایه‌‌ها می­باشند. تحقیق حاضر با استفاده از روش نشرآوایی سی اسکن و سی تی اسکن به بررسی تاثیر ابعاد و چینش لایه‌‌ها بر خرابی صفحات کامپوزیتی اثر ضربه سرعت پایین پرداخته است. بدین منظور چهار نمونه با ساختار شبه ایزوتروپ با لایه‌‌چینی [45m/0m/90m/-45m]ns ساخته شده و تحت بارگذاری قرار گرفتند و سیگنال‌های نشرآوایی آن‌ها ثبت شدند. سه نمونه IS، PS و SS بر اساس استاندارد D6264/D6264M، و یک نمونه مرجع R که نصف ابعاد درون صفحه­ای سه نمونه­ی قبلی را دارند بررسی شدند. مقادیر m و n متناسب با طراحی مورد نظر تغییر کرده است. داده­های آزمون نشرآوایی با استفاده از تابع سنتری تحلیل شدند و سپس تصاویر سی اسکن و سی تی اسکن نیز جهت مشاهده اندازه و محل خرابی­ها به کار گرفته شدند. نتایج این تحقیق نشان داد که تغییرات ابعادی و نوع لایه چینی باعث تغییر نوع و شدت مکانیزم­های خرابی و رفتار مکانیکی مواد کامپوزیتی می­شود. همچنین نشان داده شده است که آزمون نشرآوایی توانایی مشاهده تاثیر ابعاد و لایه چینی در کامپوزیت­های شیشه/اپوکسی را دارد.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Utilizing Acoustic Emission for Studying Scaling and Layup Configuration Effect on Behavior of Glass/Epoxy Composite Materials Under Low-Velocity Impact

نویسنده English

Sakineh Fotouhi 1
1 Faculty of Mechanical Engineering, University of Tabriz, Tabriz, Iran
چکیده English

Composite structures under impact loading are prone to a variety of damage mechanisms such as delamination, fiber breakage, or matrix cracking. It is proven that the impact-induced damage mechanisms of composite materials are dependent on scaling (in-plane and out-of-plane) and layup configurations. The present study has investigated the effect of scaling and layup configurations on the failure mechanisms of composite materials under low-velocity impact force using acoustic emission, C-scan and CT-scan tools. For this purpose, four samples with quasi-isotropic configurations of [45m/0m/90m/-45m]ns were manufactured, then they were loaded and acoustic signals were recorded. The three IS, PS, and SS samples were investigated based on D62624/D6264M ASTM standard test and the R sample had half of the in-plane dimension of them. The variables m and n vary according to the design plan. The obtained acoustic emission data were analyzed using sentry function, then C-Scan and CT-scan were utilized for damages’ size and location. It was proven that scaling and layup configuration affect the type and intensity of damage mechanisms as well as mechanical behavior of the laminated composites. Furthermore, the acoustic emission method is shown as an indicator of scaling and layup configuration effects in glass/epoxy composite materials under the low-velocity impact.

کلیدواژه‌ها English

CT-scan
Glass
Epoxy
Composite Materials
Configuration
Scaling
Impact
Acoustic emission
C-scan
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