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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
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
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
S. Mandayam/ECE Dept./Rowan University
Current Test Platform DesignCurrent Test Platform DesignFrame
Load TransducerSpecimen
LoadingScrews
Specimen ClampingBracket
S. Mandayam/ECE Dept./Rowan University
AE Stress Testing PlatformAE Stress Testing Platform
1/24/2003
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
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
S. Mandayam/ECE Dept./Rowan University
AE ResultsAE Results
S. Mandayam/ECE Dept./Rowan University
AE ResultsAE Results
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Amplitude (dB)
Test 1 Test 2 Test 3
Maximum Amplitude of Acoustic Emissions: Uniaxial vs. Biaxial Loading
Uniaxial
Biaxial
S. Mandayam/ECE Dept./Rowan University
AE ResultsAE Results
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Amplitude (dB)
Test 1 Test 2 Test 3
Average Amplitude of Acoustic Emissions: Uniaxial vs. Biaxial
Uniaxial
Biaxial
S. Mandayam/ECE Dept./Rowan University
AE ResultsAE Results
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Acoustic Emissions
Test 1 Test 2 Test 3
Total Number of Acoustic Emissions: Uniaxial vs. Biaxial
Uniaxial
Biaxial
S. Mandayam/ECE Dept./Rowan University
Location ViewLocation View
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
