نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد، دانشکده مهندسی مکانیک، دانشگاه علم و صنعت ایران، تهران.

2 دانشکده مهندسی مکانیک، دانشگاه علم و صنعت ایران، تهران

3 استادیار، دانشکده مهندسی مکانیک، دانشگاه علم و صنعت ایران، تهران.

10.22068/jstc.2022.546257.1765

چکیده

ارزیابی غیرمخرب افت خواص مکانیکی و ضخامت سازه‌‌های دو لایه به منظور پایش سلامت این سازه‌ها از اهمیت بالایی برخوردار است. هدف این پژوهش پیشنهاد یک روش ارزیابی غیرمخرب بر پایه گسترش امواج لمب برای بررسی سازه‌‌های دو لایه فلز-کامپوزیت بوده است. بدین منظور، مدل اجزای محدود یک صفحه فولادی پوشش داده شده با کامپوزیت ایجاد شد که در آن پوشش کامپوزیتی از لایه‌های نمد الیاف شیشه خرد شده و پارچه فیبر شیشه روینگ بافته شده تشکیل شده بود. مود پادمتقارن اصلی موج لمب (A0) با فرکانسهای تحریک مختلف در نمونه‌های دو لایه مدل شده گسترش یافتند. نمودارهای پراکندگی مود A0 موج لمب با در نظر گرفتن ضخامتهای مختلف و افت خواص مکانیکی لایه فلزی و پوشش کامپوزیتی بدست آمدند. بر اساس نتایج بدست آمده مشاهده شد که تاثیر ضخامت و افت خواص مکانیکی صفحه فولادی بر سرعت مود A0 موج لمب بیشتر از تاثیر ضخامت و افت خواص مکانیکی پوشش کامپوزیتی بود. همچنین، تخمین ضخامت پوشش کامپوزیتی در فرکانس‌های پایین بهتر انجام شد، در حالی که شناسایی افت خواص مکانیکی پوشش کامپوزیتی و صفحه فولادی در فرکانس‌های بالاتر بهتر صورت گرفت. در نتیجه،‌ روش شبیه‌سازی گسترش امواج لمب می تواند به عنوان یک آزمایشگاه مجازی برای ایجاد روشهایی برای ارزیابی غیرمخرب سازه‌‌های دو لایه فلز-کامپوزیت با خواص مکانیکی و ضخامت‌های مختلف مورد استفاده قرار گیرد.

کلیدواژه‌ها

عنوان مقاله [English]

Nondestructive evaluation of bilayer metal-composite structures using finite element simulation of guided Lamb wave propagation

نویسندگان [English]

  • Yousef Parvari 1
  • Hasan Ramezani 2
  • Siavash Kazemirad 3

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.

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

چکیده [English]

Nondestructive evaluation (NDE) of the mechanical properties and thickness loss of bilayer structures is of great importance for health monitoring purposes. This study aimed to propose an NDE method based on the Lamb wave propagation for the inspection of bilayer metal-composite structures. The finite element model of a steel substrate coated with a layered composite material was developed, where the composite coating constituted by chopped strand glass fiber mat and woven roving glass fiber cloth layers. The fundamental antisymmetric Lamb wave mode (A0) with different excitation frequencies were generated and propagated on the modeled bilayer specimens. The dispersion curves for the A0 Lamb wave mode were obtained for the simulated specimens, considering different thicknesses and a range of material properties decay for the metal substrate and composite coating. The obtained results showed that the effect of the thickness and decay in the mechanical properties of the substrate on the A0 Lamb wave mode velocity was more than the effect of the thickness and decay in the mechanical properties of the composite coating. Besides, the estimation of coating thickness was performed more accurately at low frequencies, while the decay in the mechanical properties of the coating and substrate was better evaluated at higher frequencies. It was concluded that the simulated Lamb wave propagation method can be used as a virtual lab for the development of methods for nondestructive evaluation of bilayer metal-composite structures with different material properties and thicknesses.

کلیدواژه‌ها [English]

  • Guided waves
  • Lamb wave
  • composite coating
  • Coated structures
  • Finite element modeling
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