Scattering of Lamb Waves From Typical Structure Defects in Plates - Essay Example

Scattering of Lamb Waves from Typical Structure Defects in Plates Hatem Alharbi a1184188 Introduction The term Structural Health Monitoring (SHM) is generally defined as a process of implementing a damage detection and characterization plan or strategy for an engineering structure. Due to potential significant of life-safety and economic benefits SHM have vital importance and in last couple of decades a significant increase in research has been done in this field. Various techniques have been developed to locate, identify and quantify structural damage to save lives and avoid any economic loss.

SHM through the scattering of Lamb waves from typical structure defects using piezoelectric transducer (PZT) sensors and 3-D Scanning Laser vibrometry and simulation the results by using Autodyne ANSYS is an important wildly recognized non-destructive evaluation SHM technique to locate, identify and quantify the structural damage and hence we can improve the survivability of mechanical structure. In current project work, 3D laser vibrometer will be applied to locate, identify and quantify typical structural damage in aluminium.

Academic objectives The main objective of project work is conducted a feasibility study on the application of 3D laser vibrometer in conjunction with Lamb wave technique. Aims1- To review and evaluate the research development that has been done in SHM including various tools and techniques involved in SHM.2- Design experiment Rig.3- Conduct measure.4- Analyse the results with 3D finite element (3DFE).Methodology1- The project work will be carried out first by reviewing the various research works and techniques involved in SHM including project related above mentioned non-destructive evaluation SHM technique with Autodyn ANSYS as simulation tool.

The information obtained through literature review will further be used for practical work to study and investigate the various aspects of practical applications.2- Since the practical work involved the application of 3D laser vibrometer in conjunction with Lamb wave technique to locate, identify and quantify typical structural damage like any crack, corrosion and dent, hence as next step I have to prepare test specimens. The test specimen can be a single aluminium plate having all three structural damages or three separate aluminium plates with different structural damage.

For my experiment for the worse case situation, I have to prepare a single aluminium plate of 800 X 200 X 20 mm dimensions with all three defects i.e. crack, corrosion and dents as shown in following figure 1, 2 and 3 below. Fig. 1 Crack damageFig. 2 Corrosion damageFig.3 Dents damage3- My next step will be to fabricate the sensing devices to the specimen. Since I am using piezoelectric transducer (PZT) as sensors to Lamb wave through 3-D laser scanning hence I fabricate PZT to target plate.4- After adjusting all experiment apparatus, as a final step the specimen is scanned through 3-D laser and data will be stored and analysed for SHM for structural damage.

5- All the information obtained through literature review, project procedure, observations and experimental results are recorded and presented in project final report.