s. mandayam/ece dept./rowan university project objectives design and develop test-platforms for...
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![Page 1: S. Mandayam/ECE Dept./Rowan University Project Objectives Design and develop test-platforms for performing Acoustic Emission (AE) measurements on defective](https://reader035.vdocument.in/reader035/viewer/2022062518/56649d765503460f94a57ffb/html5/thumbnails/1.jpg)
S. Mandayam/ECE Dept./Rowan University
Project ObjectivesProject Objectives
• Design and develop test-platforms for performing Acoustic Emission (AE) measurements on defective pipe segments under bi-axial stress conditions
• Develop empirical relations between stress and AE signal parameters
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S. Mandayam/ECE Dept./Rowan University
Major TasksMajor Tasks
• Specimen fabrication• Set-up for 2-D Tensile Testing• Instrumentation (AE and control) and
data acquisition set-up• AE testing: collaboration with Physical
Acoustics Corporation• Signal analysis
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S. Mandayam/ECE Dept./Rowan University
Conceptual Design: Conceptual Design: Test Platform Test Platform
DataAcquisition
SignalConditioning
Display/User Interface
Specimen
Load Cell
SimulatedDefect Double
ActingHydraulicRam
AESensors
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S. Mandayam/ECE Dept./Rowan University
Current Test Platform DesignCurrent Test Platform DesignFrame
Load TransducerSpecimen
LoadingScrews
Specimen ClampingBracket
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S. Mandayam/ECE Dept./Rowan University
AE Stress Testing PlatformAE Stress Testing Platform
1/24/2003
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S. Mandayam/ECE Dept./Rowan University
Specimen FabricationSpecimen Fabrication• Provided by Shell Oil Co.• 0.5” Thick SA-516 grade 70
Steel Coupons• Simulated Cracks of varying
depths• .08”, .16”, and .32” deep
• Two sets of 3 specimens each• Uni-axial and Biaxial Loading
• simulates axial and hoop stresses of a pressurized pipeline
• Also machine specimens in house with saw cut defect
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S. Mandayam/ECE Dept./Rowan University
Test ParametersTest Parameters
• Uniaxial Load Test• Axis-1: 20,000 lbs• Axis-2: 0 lbs
• Biaxial Load Test• Axis-1: 20,000 lbs• Axis-2: 10,000 lbs
• Saw-cut simulated crack
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S. Mandayam/ECE Dept./Rowan University
AE ResultsAE Results
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S. Mandayam/ECE Dept./Rowan University
AE ResultsAE Results
50
55
60
65
70
75
80
85
90
Amplitude (dB)
Test 1 Test 2 Test 3
Maximum Amplitude of Acoustic Emissions: Uniaxial vs. Biaxial Loading
Uniaxial
Biaxial
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S. Mandayam/ECE Dept./Rowan University
AE ResultsAE Results
40
42
44
46
48
50
52
54
56
58
60
Amplitude (dB)
Test 1 Test 2 Test 3
Average Amplitude of Acoustic Emissions: Uniaxial vs. Biaxial
Uniaxial
Biaxial
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S. Mandayam/ECE Dept./Rowan University
AE ResultsAE Results
0
50
100
150
200
250
Acoustic Emissions
Test 1 Test 2 Test 3
Total Number of Acoustic Emissions: Uniaxial vs. Biaxial
Uniaxial
Biaxial
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S. Mandayam/ECE Dept./Rowan University
Location ViewLocation View
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S. Mandayam/ECE Dept./Rowan University
Future StepsFuture Steps
• Modify test platform design• Hydraulic System to reach desired load• Extraneous Sound Dampening
• Test Shell specimens
• Parameterize AE signatures for 1-D and 2-D stress loading