Damage Detection in Bolted Joint by Lamb Wave Technique

Abstract

Lamb waves are a type of ultrasonic waves has a wide range of applications in non-destructive testing. Most of the studies used simple and flat structures for breaking, cracking or corrosion damages. In this study, the detection of damage in the welding is examined. Two 4.5mm thickness AL2024 plates joined by overlay welding method. Damage was applied to the weld region gradually. Three piezoelectric (PZT) discs were used to create surface waves and to monitor their propagation. For better examination, the envelopes of the monitored signals were calculated by using the Hilbert transform. Damages occurring in the weld region, has led to reflections and attenuation in waves. The study indicated that degradation occurring in the weld can be identified with the Lamb wave technique

Keywords

• Lamb wave
• Hilbert transform
• structural health monitoring

Cıvatalı Birleştirmelerdeki Hasarların Lamb Dalgası Tekniğiyle Bulunması

Abstract

Bu çalışmada, cıvatalı birleştirmeye sahip yapılardaki cıvata hasarlarının gerçek zamanlı bulunması hedeflenmektedir. Yapılan çalışma ile Alüminyum 2024 plakaları birleştiren cıvatalardaki gevşemeler bulunabilmektedir.  Cıvatalı birleştirmelerde Lamb dalgaları türlerinden olan düşük frekanslı asimetrik A0 ve yüksek frekanslı simetrik S0 modlarının karşılaştırılması yapılmıştır. Sonuç olarak S0 modunun bu tip birleştirmelerde hasar belirlenmesinde kullanılamayacağını görülmüştür. S0 modunda cıvataların İletilen enerji çok zayıflattığı ve cıvatalardan enerji çok büyük kısmına geri yansıttığı ortaya konulmuştur. A0 modunun ise daha uygun olduğu görülmüştür. Sinyallerin birleştirme bölgesinin diğer kısmına daha az kayıpla geçtiği, hem de yansıma özelliği barındırdığı görülmüştür.

Keywords

• Lamb dalgası
• Yapısal durum izleme
• Hasarların Lamb

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