Presentation is loading. Please wait.

Presentation is loading. Please wait.

Non Destructive Testing: Finding Defects in Metal Objects

Similar presentations

Presentation on theme: "Non Destructive Testing: Finding Defects in Metal Objects"— Presentation transcript:

1 Non Destructive Testing: Finding Defects in Metal Objects
Design Team 4: Chad Church Ron Fox John Vogel Geoff Brigham Matt Hamm

2 Agenda The Need For Non-Destructive Testing Methods of NDT Summary
Eddy Currents Acoustic Ultrasonic Testing Summary

3 Non-Destructive Testing
“Test object, material or system without impairing its future usefulness” Industrial Application Crack Detection Wall Thinning Porosity Thickness of Material Medical Application Ultrasound X-Ray

4 Benefits of NDT Ensure Product Integrity To Avoid Failures
Better Product Design Lower Manufacturing Costs Maintain Uniform Quality Level

5 Methods of NDT Visual Testing Penetrant Testing
Magnetic Particle Testing Infrared/Thermal Testing Eddy Current Testing Acoustic Emission Testing Ultrasonic Testing

6 Method: Eddy Currents Eddy current probe is a coil of wire
Induces a magnetic field Induces a current in the part Induces a current in the probe Measure the Current VICTORY!

7 Method: Eddy Currents Detect: Depth of penetration “Skin effect”
Conductivity Magnetic Permeability Distance Presence of a flaw Depth of penetration “Skin effect” Exponential drop-off

8 Method: Eddy Currents Limitations Aluminum parts Iron parts

9 Method: Acoustic Testing
Inspiration: Hit it with a hammer, listen Resonance frequency Harmonic frequencies Fourier transform

10 Method: Acoustic Testing
Mechanical impact on different locations Microphone reception Fourier Transform Correlation of multiple impact resonations doi: /jaer     

11 Method: Acoustic Testing

12 Method: Acoustic Testing

13 Method: Acoustic Testing
Variety of material and composition Environmental deterioration Damping Access to many points

14 Method: Ultrasonic Testing
What is Ultrasound? Sound Waves 100 KHz to 50 MHz for NDT Short Wavelength Reflections Off Small Defects Requires Elastic Medium

15 Method: Ultrasonic Testing
Components of an Ultrasonic Flaw Detector Power Supply Timer Pulser/Amplifier Ultrasonic Transducer Receiver Computer Display

16 Method: Ultrasonic Testing
Ultrasonic Transducer Electrical Energy Mechanical Energy Piezoelectric Effect Alternating Voltage Applied To Crystal Crystal Expands and Contracts Creates High Frequency Alternating Charge on Crystal

17 Method: Ultrasonic Testing
Couplants High Frequency/Short Wavelength Minimal Propagation in Air Medium Types of Couplants Oil Glycerine Water Another Option Direct Contact Transducer

18 Method: Ultrasonic Testing
Advantages of Ultrasonic Testing Fast Response Accuracy High Sensitivity Flexibility Penetrating Power

19 Method: Ultrasonic Testing
Limitations of Ultrasound Sensitivity Resolution Noise Discrimination

20 Summary Necessary to use a Non Destructive Testing Eddy Currents
Abilities Problems Acoustic Ultrasound Team Designed Method (

21 Questions?

Download ppt "Non Destructive Testing: Finding Defects in Metal Objects"

Similar presentations

Ads by Google