Non-Destructive Evaluation Ultrasound Testing Team: David Drozd Sean Broderick Rick Eckert Joseph...
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Transcript of Non-Destructive Evaluation Ultrasound Testing Team: David Drozd Sean Broderick Rick Eckert Joseph...
Non-Destructive Evaluation
Ultrasound Testing
Team:
David Drozd
Sean Broderick
Rick Eckert
Joseph OagaroConsultant:
Michael Ciocco
Project Manager:
Shreekanth Mandayam
Introduction Ultrasound Applications
NDE of metals and composites Airplanes, Tanks, Sewer & Gas Pipelines
Customers Needs Internal Customer: Shreekanth Mandayam
Effective Composite Scanning to find defect geometry, depth, and location
External Customer Future Marketing to airplane and pipeline
manufacturers
Previous Work Done Ultrasound Testing of Concrete
Objectives Learn fundamentals in ultrasound testing
and ultrasound equipment Image metal plates with known defects
and build ultrasound C-scan database Scan Kevlar composites to find evidence
of disbonding and delaminations Use Matlab for image processing to
estimate defect geometry
Ultrasonic Inspection Project Outline
Ultrasound Basic Metal C-Scans Kevlar Composites Image Processing
Project Timescale
Immersion Ultrasound Test Station
Ultrasound transducers Testspecimen
Immersiontank
Linearactuators forscanning
Scanner controller & stepper motors
PC fordata acquisition & processing
Ultrasound Scanning Basics
Thru Transmission vs. Pulse Echo
A-Scan and C-Scan
TOF and Amplitude
A-Scan and Gate Settings
Settings Detection Threshold: 40%, Gate Width: 14.46
us, Gate Start: 52.40us, Gain: 39db
Ultrasonic Inspection Project Outline
Ultrasound Basic Metal C-Scans Kevlar Composites Image Processing
Project Timescale
Ultrasound Imaging of Coins
C-Scans of 5/16” Metal Plates
5/16” thick metal plate with 3mm defect
5/16” thick metal plate with 7.5 mm defect
C-Scans of ½” Metal Plates
½” thick metal plate with 3 mm defect
½” thick metal plate with 6 mm defect
½” thick metal plate with 7.5 mm defect
C-Scans of triangle and circle defects
3/8” thick plate with 3/16” circle
defect
3/8” thick plate with 3/16” triangle defect
Ultrasonic Inspection Project Outline
Ultrasound Basic Metal C-Scans Kevlar Composites Image Processing
Project Timescale
Kevlar Kevlar Composites Company located in Canada There are 2 types of Kevlar:
Pretreated Kevlar Non-Pretreated Kevlar
Delamination
Kevlar
First Scans of Kevlar
Each scan 1’x1’Starting from The right corner
Non-Pretreated Kevlar
KevlarNon-Pretreated Kevlar
KevlarPretreated Kevlar
Ultrasonic Inspection
Project Outline Ultrasound Basic Metal C-Scans Kevlar Composites Image Processing
Project Timescale
Image Processing Objective
Determine Geometry of Defects From Experimental C-Scan Images
Use Fourier Descriptors to apply to arbitrary defect geometries
Approach: Use basic image processing techniques
to estimate image shape and size
Image Processing Approach
Metal Specimen
C-Scan
Adjusted Image
Experimental Data
Original C-Scan
Histogram Balancing
Image Smoothing
Image Defect Geometry:
Actual Experimental
Length = 1 in. Length = 0.85 in.
Width = 0.5 in. Width = 0.43 in.
Metal Specimen
Image Processing Techniques
Random Defect Geometries Determine Fourier Descriptors of perimeter of
any arbitrary shape Insensitive to:
Translation Rotation Scale Changes
How to model? Develop basic shape images and process
Circle, Rectangle, Triangle, Ellipse, etc.
Project Timescale
Future Planning Continue Scanning
Build Database Metal, Kevlar, Coins, etc.
Model Random Defect Geometries Continue Processing Research Research Paper / Competition
Ultrasonic Inspection
¿ Questions/Comments ?