مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

ارزیابی ناحیه عیب ناشی از ضربه در کامپوزیت پایه پلیمریِ تقویت شده با الیاف کربن با دو روش رادیوگرافی و آزمون فراصوتی روبش C

نویسندگان
1 دانشکده مهندسی مکانیک، دانشگاه تربیت دبیر شهید رجایی، تهران، ایران
2 دانشیار در دانشگاه تربیت دبیر شهید رجایی
3 استادیار دانشگاه تربیت دبیر شهید رجایی
4 استاد، گروه مهندسی مکانیک، شیمی و مواد، دانشگاه کالیاری، ایتالیا
چکیده
امروزه استفاده از مواد کامپوزیتی پایه پلیمری در صنایع مختلف به دلیل خواص مکانیکی خوب، سبکی و عایق بودن نسبت به حرارت و صوت و مقاومت به خوردگی با استقبال روزافزونی مواجه شده است. طی دو دهه اخیر، کامپوزیت‌های پایه پلیمریِ تقویت شده با الیاف کربن دارای ساختار لایه‌ای کاربرد فراوانی در صنایع هوافضا و اتومبیل یافته‌اند. این مواد ممکن است در زمان تولید یا سرویس، تحت ضربه قرار گرفته و ناحیه عیب کوچکی در آن‌ها به وجود آید. این عیب کوچک می‌تواند باعث کاهش خواص مکانیکی سازه شده و منجر به شکست آن گردد. از این رو لزوم بهره‌گیری از روشی جهت تشخیص عیوب در این مواد احساس می‌شود. در این مقاله، نمونه‌ کامپوزیتی پایه پلیمری از الیاف کربن در رزین پلی استر ساخته شد و تحت آزمون ضربه قرار گرفت. به منظور در نظر گرفتن تکرارپذیری در فرایند عیب یابی، نمونه تحت 4 آزمون متفاوت ضربه قرار گرفت و نواحی عیب با استفاده از روش‌های آزمون رادیوگرافی با مایع نافذ و آزمون فراصوتی بازتابی به روش غوطه‌وری روبش C، مورد ارزیابی قرار گرفت. تصویر حاصل از روش رادیوگرافی با استفاده از دستگاه اسکنر دیجیتال، اسکن شد و همچنین تصویر حاصل از آزمون فراصوتی روبش C، با در نظر گرفتن مقدار رزولوشن در آزمون، کالیبره گردید. مساحت نواحی عیب با استفاده از نرم افزار ایمیج جی بدست آمد. بررسی نتایج حاصل حاکی از توانایی دو روش مذکور در تشخیص و اندازه گیری نواحی عیب در نمونه کامپوزیتی می‌باشد و روش روبش C ناحیه عیب را با دقت بیش‌تری می‌یابد.
کلیدواژه‌ها

عنوان مقاله English

Impact Area Assessment in the Carbon Fiber Reinforced Polymer Composite using Radiography and Ultrasonic C-scan testing methods

نویسندگان English

Seyyed Abbas Arhamnamazi 1
Nasrollah Banimostafa Arab 2
Amir Refahi Oskouei 3
Francesco Aymerich 4
1 Mechanical Engineering Department, Shahid Rajaee Teacher Training University, Tehran, Irann
2 َAssociate Professor in Shahid Rajaee Teacher Traning University
3 Assistant Professor Shahid Rajaee Teacher Training University
4 Department of Mechanical Engineering, Chemistry and Materials, Cagliari University, Cagliari, Italy
چکیده English

Nowadays, the use of polymer composite materials in various industries has been increased due to their good mechanical properties, lightness, sound and thermal insulation and corrosion resistance. Over the past two decades, carbon fiber reinforced polymer (CFRP) materials have been widely used in aerospace and automotive industries. These materials may be subjected to impact during manufacturing or service period and a lsmal impact region may be produced in them. This small defect can reduce the mechanical properties of the structure and lead to its failure. Therefore, it is necessary to use a method for defect detection in these materials. In this study, a polymer composite sample made of carbon fiber in polyester resin was made and subjected to impact test. To consider the repeatability of the defect detection process, the sample was subjected to four various impact tests and the defect areas were evaluated using penetrant-enhanced X-ray radiography and ultrasound immersion pulse-echo C-scan. The image obtained from the penetrant-enhanced X-ray method was scanned using a digital scanner, and the image of the ultrasound C-scan test was calibrated, taking into account the step of scanning.The areas of the defect region were obtained using Imagej software. The results show that these methods are able to detect and measure the impact area in the composite sample and Ultrasonic C-scan method detect impact area more accurately.

کلیدواژه‌ها English

Carbon Fibre Reinforced Polymer
Non-Destructive Testing
Radiography
Ultrasonic C-scan
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