Ultrasonik Lamb Dalgaları Kullanılarak Kompozit Malzemelerde Yüzey Hasarlarının İncelenmesi

Abstract

Bu araştırmada kompozit malzemelerdeki hasarların hava temaslı ultrasonik yöntemle belirlenmesi amaçlanmıştır. Hasarlı malzemelerin C-tarama görüntülerini elde etmek için ultrasonik lamb dalgaları kullanıldı. Bu araştırmada kullanılan malzemelerin yüzeylerinden veri elde etmek için bir çift düzlemsel hava temaslı transduser (500 kHz-Ultran Group-ABD) ve hava temaslı bir tarama sistemi (MISTRAS-EPA, Fransa) kullanılmıştır. Bu dönüştürücüler, kuzu dalgalarını elde etmek için farklı geliş açılarında yerleştirildi. A-tarama sinyalleri olarak elde edilen veriler, txt verisi formatında kaydedildi. Bu txt verileri, malzemelerin yüzeylerinin C-tarama görüntülerini çizmek için MATLAB kodlarıyla işlendi. Bu araştırmadan elde edilen sonuçlar, kompozit malzemelerdeki yüzey hasarlarının ultrasonik lamb dalgaları kullanılarak karakterize edilebileceğini göstermiştir.

Keywords

• Tahribatsız test
• hava temaslı ultrasonik
• yüzey hasarları
• kompozit
• balpeteği sandviç kompozitler

Investigation of Surface Damages in Composite Materials Using Ultrasonic Lamb Waves

Abstract

In this research, it was aimed to figure out the damages in composite materials using air-coupled ultrasonic method. The ultrasonic lamb waves were used to obtain C-scan images of damaged materials. A couple of planar air coupled transducers (500 kHz-Ultran Group-USA) and an air-coupled scanning system (MISTRAS-EPA, France) were used for obtaining the data from the surfaces of materials used in this research. These transducers were located in different incidence angles for obtaining the lamb waves. The data obtained as A-scan signals was saved in txt data. This txt data was processed with the MATLAB codes for drawing C-scan images of the surfaces of materials. The results obtained from this research showed that the surface damages in composite materials can be characterized with using ultrasonic lamb waves.

Keywords

• Non-destructive testing
• air–coupled ultrasonic
• surface damages
• composites
• honeycomb sandwich composites

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