| 摘要 | 第6-8页 |
| ABSTRACT | 第8-9页 |
| Chapter 1 Introduction | 第15-23页 |
| 1.1 Problem statement and background | 第15-20页 |
| 1.1.1 Adhesive bonded joints in automotive industry | 第15-16页 |
| 1.1.2 Deflects in adhesive bonded joints | 第16-17页 |
| 1.1.3 Inspection methods for bonded joint | 第17-20页 |
| 1.2 Literature review | 第20-22页 |
| 1.3 Thesis Objectives | 第22-23页 |
| Chapter 2 Principles | 第23-27页 |
| 2.1 The principle of the air-coupled guided wave inspection technique | 第23-24页 |
| 2.2 The lamb waves propagation in the solid domain | 第24-25页 |
| 2.3 The key problems in this technique | 第25-27页 |
| 2.3.1 Energy loss in the propagation | 第25-26页 |
| 2.3.2 Boundary condition at the interface | 第26-27页 |
| Chapter 3 Simulation | 第27-50页 |
| 3.1 Calculation of dispersion curves | 第27-33页 |
| 3.1.1 The introduction of CIVA simulation tool | 第27-28页 |
| 3.1.2 The dispersion curves of the aluminum plate | 第28-29页 |
| 3.1.3 The dispersion curves of the bonded joints | 第29-33页 |
| 3.2 The COMSOL-Multiphysics simulation study using benchmark | 第33-38页 |
| 3.2.1 The introduction of COMSOL-Multiphysics | 第33-34页 |
| 3.2.2 Set-up of the benchmark model | 第34-36页 |
| 3.2.3 Result comparison between literature and model | 第36-38页 |
| 3.3 The simulation for the theoretical bonded joint inspection | 第38-45页 |
| 3.3.1 Set-up of the theoretical bonded joint inspection | 第38-39页 |
| 3.3.2 The results from the model | 第39-40页 |
| 3.3.3 The influence caused by the incident angle and air-gap | 第40-44页 |
| 3.3.4 Detection of the imperfection bonded joint by simulation | 第44-45页 |
| 3.4 The simulation for specimens | 第45-50页 |
| 3.4.1 The simulation of the real aluminum plate | 第45-47页 |
| 3.4.2 The simulation of the real bonded joint | 第47-50页 |
| Chapter 4 Validation and result analysis | 第50-63页 |
| 4.1 Experiments of the aluminum plate inspection | 第50-54页 |
| 4.1.1 The influence caused by the incident angle | 第50-52页 |
| 4.1.2 The influence caused by the air-gap | 第52-54页 |
| 4.2 Experiments for the bonded joint inspection | 第54-58页 |
| 4.2.1 The influence caused by the incident angle | 第54-56页 |
| 4.2.2 The influence caused by the distance between transducers | 第56-58页 |
| 4.3 Comparison between experiments and simulations | 第58-63页 |
| 4.3.1 The comparison for the aluminum plate inspection | 第58-60页 |
| 4.3.2 The comparison for the bonded joint inspection | 第60-61页 |
| 4.3.3 Exploration of the defect testing by simulation | 第61-63页 |
| Conclusion and outlook | 第63-65页 |
| Acknowledgements | 第65-66页 |
| Reference | 第66-71页 |
| 攻读硕士学位期间发表的论文及科研成果 | 第71页 |
