ارزیابی غیرمخرب ترک‌های داخلی در مواد مرکب تقویت‌شده با الیاف شیشه به کمک روش تداخل‌سنجی برشی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 ساخت و تولید، مهندسی مکانیک، دانشگاه تربیت مدرس

2 استادیار- دانشکده مهندسی مکانیک- دانشگاه تربیت مدرس

چکیده

روش تداخل‌سنجی برشی لیزری یا برش‌نگاری، یکی از روش‌های نوین آزمون‌های غیرمخرب است که بر پایه‌ی تداخل امواج تک‌رنگ بازتاب‌شده از سطح نمونه می‌باشد. این روش، با اندازه‌گیری مستقیم گرادیان جابه‌جایی خارج از صفحه، قادر است با دقت و سرعت بالایی تمام سطح نمونه را به‌طور یکجا مورد ارزیابی قراردهد. در این مقاله امکان تشخیص ترک‌های زیرسطحی با طول و زاویه‌های مختلف در نمونه‌های کامپوزیتی به کمک روش برش‌نگاری و سیستم تحریک حرارتی مورد بررسی قرار گرفته است. به‌این منظور، در نمونه‌های ساخته‌شده، ترک‌های مصنوعی و کنترل‌شده با طول و زاویه‌های مختلف ایجاد شد. پس از صحت‌سنجی عملکرد چیدمان برش‌نگاری، از دو منبع حرارتی تشعشعی برای اعمال بار روی نمونه‌ها استفاده شد. تاثیر متغیرهای اندازه بارگذاری، اندازه و جهت برش، طول ترک و زاویه‌ی آن‌ها بر روی کیفیت نتایج، مورد بررسی قرار گرفت. نتایج حاصله نشان می‌دهد که تغییر در اندازه‌ی بارگذاری، نقش مهم‌تری را نسبت به تغییر در اندازه‌ی برش در تشخیص صحیح ترک دارد. برای دست‌یابی به بهترین نتایج در تشخیص ترک بر روی نمونه‌های انتخاب‌شده، بارگذاری بهینه در حالت حرارتی برابر 12 و 15 ثانیه از جلوی نمونه بدست آمد. همچنین اندازه‌ بهینه‌ی برش در نمونه‌های کامپوزیتی مورد بررسی، حدود ده درصد عرض تصویر ثبت‌شده توسط دوربین تخمین زده‌شد. به کمک این مقادیر بهینه‌شده، تمامی ترک‌های زیرسطحی شناسایی شدند.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Non-destructive evaluation of internal cracks in glass fiber-reinforced polymers using digital shearing interferometry

نویسندگان [English]

  • farzad banakar 1
  • Davood Akbari 2
1 Mechanical Engineering, Tarbiat Modares University
چکیده [English]

Shearography is one of the advanced methods of non-destructive techniques based on the interference of laser beams that have been reflected from the surface of the specimen. This method, which has high speed and accuracy, can evaluate the displacement derivative on the sample surface at once. In this paper, the possibility of sub-surface cracks detection with different lengths and angles in composite samples was investigated by shearography method and thermal stimulation system. For this purpose, in composite samples, controlled cracks were created with different lengths and angles. After calibration of the performance of the shearography setup, two heat sources of radiation were used to load samples. Loading quantity, the amount and direction of the shear, the cracks length, and their angles were chosen as the studied parameters. The results of this paper showed that the optimum loading amount plays a more critical role in the quality of the results than shear amount, and this value is related to the materials of the samples. To achieve the best results in crack detection on the selected specimens, optimum thermal loading was obtained between 12 and 15 seconds from in front of the specimen. Also, the optimum shear amount in the composite specimens was estimated at about 0.1 image width recorded by the camera. With the optimized values, all sub-surface cracks were identified.

کلیدواژه‌ها [English]

  • Laser shearing interferometry
  • Shearography
  • Non-destructive test
  • composite
  • crack detection
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