INTRODUCTION TO NDT SLIDE.pptx
- 1. To RUPREKHA PATRO Senior Research Fellow at Defence Research and Development Laboratory (DRDL) - DRDO
- 2. OUTLINES What is NDT Purpose of NDT Objective Of NDT Difference Between Destructive and Non-destructive testing Advantages and Disadvantages NDT Technology Types And Methods Application Standards For NDT
- 3. What Is NDT Non destructive testing is a non-invasive inspection techniques used to evaluate material properties, components, or entire process units. NDT is the “development and application of technical methods to examine materials or components in ways that do not impair future usefulness and serviceability in order to detect, locate, measure and evaluate flaws; to assess integrity, properties and composition; and to measure geometrical characteristics.”
- 4. Objective/purpose Of Non Destructive Testing Material sorting Material characterization Property monitoring (for process control) Thickness measurement Defect Detection/ Location and Defect characterization.
- 5. “Development and application of technical methods to examine materials or components in ways that do not impair future usefulness and serviceability in order to detect, locate, measure and evaluate flaws; to assess integrity, properties and composition; and to measure geometrical characteristics.” Non-destructive testing
- 6. Destructive Testing Destructive testing methods are commonly used for materials characterization, fabrication validation, failure investigation. In this technique, an application is intentionally made to fail to check the robustness and identify the points of failure.
- 7. Difference Between destructive and Non Destructive testing Non destructive testing Destructive Testing It do not alter the sample or structure. It involves damaging some of structure or elements. Used for finding out defects in materials. Used for find out properties of materials. Load is not applied on material Load is applied on material Non expensive Expensive Application: Surface/Ground penetrating radar, cover meter, Resistivity Application: Test on hardened Specimen made specifically is destructive Ex: Liquid penetrant testing,Radiography,ultrasaonic Ex: Tensile testing, Compression Testing
- 8. Selection Of NDT Methods Depends On • Material • Process • Location and Orientation • Surface roughness and Surface Condition • Size, Shape and Complexity • Magnetic and Non-Magnetic • Electrical Conductivity • Cost • Accessibility