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

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