علوم و فناوری کامپوزیت

شبیه‌سازی عددی و تجربی دمانگاری برای شناسایی جدایش در آلومینیوم ترمیم شده با وصله کامپوزیتی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناس یارشد ، مهندسی مکانیک ، دانشگاه علم و صنعت ایران ، تهران.

2 دانشیار، مهندسی مکانیک، دانشگاه علم و صنعت، تهران.

10.22068/jstc.2019.104433.1516

چکیده

در سازه‌های مهم و حساسی مانند هواپیما، کشتی و خطوط انتقال گاز تعویض قطعات آسیب دیده امری پرهزینه و زمان‌بر است. در نتیجه، ترمیم سازه معیوب، یک روند قابل قبول می‌باشد. به منظور ترمیم سازه‌های آسیب دیده در صنایع مختلف و به ویژه صنعت هوافضا، از وصله‌های کامپوزیتی استفاده می‌شود. ارزیابی سازه ترمیم شده برای اطمینان از بازسازی، موضوعی چالش‌برانگیز است. تکنیک دمانگاری یکی از قدرتمندترین روش‌های آزمون غیرمخرب است که برای ارزیابی سازه‌های ترمیم شده استفاده می‌شود. در مطالعه حاضر، عیوب نوع جدایش بین سازه مادر آلومینیومی و وصله کربن/اپوکسی 4 لایه با لایه‌چینی [04] به وسیله روش دمانگاری گامی ارزیابی شده است. عیوب نزدیک لبه وصله قرار گرفته‌اند چرا که در عمل، شروع جدایش در یک سازه ترمیم شده از لبه‌ها محتمل‌تر است. علاوه‌براین، به دلیل اثرات لبه، شناسایی عیوب لبه نسبت به عیوب میانی دشوارتر می‌باشد. نتایج آزمون دمانگاری گامی با استفاده از روش دمانگاری فاز پالسی پردازش شده است. همچنین شبیه‌سازی روند آزمون دمانگاری به وسیله مدل‌سازی اجزا محدود انجام شده است. در نهایت، نتایج تجربی و شبیه‌سازی اجزا محدود مقایسه شده‌اند و دقت خوبی در دمانگاری گامی و الگوریتم دمانگاری فاز پالسی بدست آمده است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Experimental and Numerical Simulation of Thermography for Detection of Disbond in Repaired Aluminum by Composite Patch

نویسندگان [English]

  • Morteza Moradi 1
  • Mir Saeed Safizadeh 2

1 School of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran.

2 School of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran.

چکیده [English]

The replacement of damaged components is not affordable in important structures such as aircraft, ship or gas pipelines. So, the repair of a defective structure is an acceptable process. Composite patches are used to repair the damaged metal and composite structures in different industries, especially the aerospace industry. Assessment of the repaired structure is a challenging topic in order to ensure the restoration. The thermography technique is one of the most powerful non-destructive testing methods that is used to survey the repaired structures. In the present study, the defects of the de-bonding type between the based aluminum structure and the carbon/epoxy patch made by 4 layers with layup configuration [04] have been investigated by step heating thermography method. Defects locate close to the patch edges because it is more likely that debond onset in a repaired structure at edges in practice. Furthermore, detection of the edge defects is more difficult than the middle defects because of edge effects. The step heating thermography results have been processed by using pulse phase thermography (PPT) approach. Also, the simulation of thermography testing procedure carried out by finite element modeling (FEM). Finally, the results of the experiment and finite element modeling have been compared and good accuracy has been obtained in step heating thermography and PPT algorithm.

کلیدواژه‌ها [English]

  • Composite patches
  • Thermography
  • Disbond
  • Finite element modeling
  • Pulse phase thermography
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علوم و فناوری کامپوزیت
دوره 6، شماره 4
اسفند 1398
صفحه 591-600
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