17-01-2011, 07:20 PM
ULTRASONIC TECHNIQUES FOR HIDDEN CORROSION DETECTION IN AIRCRAFT WING SKIN
Joby Devasia
8th Semester Mechanical Engineering
[attachment=8268]Joby Devasia
8th Semester Mechanical Engineering
CONTENTS
1. INTRODUCTION
CONVENTIONAL METHODS
DEFECTS OF CONVENTIONAL METHODS
4. PRINCIPLE OF OPERATION
5. SELECTION OF WAVE MODES
6. CORROTION DETECTION
7. EQUIPMENT & INSTRUMENTATION
8. INSTRUMENT SPECIFICATIONS
9. INSPECTION RESULTS
10. ADVANTAGES & DISADVANTAGES
INTRODUCTION
CAUSE OF CORROSION – MOISTURE, WATER, CRACKS
AREAS AFFECTED – SURFACE, LAP JOINTS, FASTENERS
3. NEED OF NDT
NON DESTRUCTIVE TESTS (NDT)
VISUAL INSPECTION
MAGNETIC PARTICLE TEST
LIQUID (DYE) PENITRATION TEST
X – RAY PENETRATION INSPECTION
EDDY CURRENT INSPECTION
ULTRASONIC INSPECTION
DEFECTS OF CONVENTIONAL SYSTEMS
INSPECTION FROM TOP NORMAL TO SURFACE
2. TIME CONSUMING FOR POINT TO POINT INSPECTION
3. INABILITY TO DETECT (a) DISBONDS IN MULTILAYER
(b) FATIGUE CRACKS AT FASTNERS