DEVELOPMENT OF VIBRATION-BASED DAMAGE DETECTION ON COMPOSITE MATERIAL

• Main Author: Rizal Ardiansyah, Muhammad
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/70286
• Institution: Institut Teknologi Bandung

Carbon fiber reinforced polymer, or CFRP, is a strong and lightweight composite material that often being used in a high-performance demanding industry such as aerospace and high-performance vehicle. However, the high-complexity process of manufacturing CFRP causes a high likelihood that defects and damages be embedded in the component. If ignored, these defects may cause a catastrophic failure during usage. Hence it is crucial to be able to reliably detect damages and defects on a CFRP component. From common industry standards, damage detection on metal material is commonly done using vibration. This gave the idea of using the same method on CFRP materials to detect embedded defects. As a proof of concept, this research tries to detect artificial delamination, fiber-breakages, and cracks on a CFRP specimens utilizing a low frequency (? 100 Hz) sinusoidal wave generated from an oscillator. Using qualitative visual observation on time and frequency domain data combined with the results from test of equivalence of spectra as a quantitative method, the vibration-based method has successfully detected the artificial damages and defects. Visual observation shows that the crack damage can be clearly detected but not the defects. The equivalence of spectra tests shows a better result that the defects can be detected and even identified from each other. In other words, the concept of using vibration as damage detection method on CFRP has been proven to be a capable method.