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Development of an Acoustic Emission Test Platform with a Biaxial Stress Loading System

Development of an Acoustic Emission Test Platform with a Biaxial Stress Loading System. Progress Report for the Period June 1 – August 31, 2003. Joseph Oagaro, Shreekanth Mandayam, John L. Schmalzel and Ronnie K. Miller. Electrical & Computer Engineering 201 Mullica Hill Road

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Development of an Acoustic Emission Test Platform with a Biaxial Stress Loading System

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  1. Development of an Acoustic Emission Test Platform with a Biaxial Stress Loading System Progress Report for the Period June 1 – August 31, 2003 Joseph Oagaro, Shreekanth Mandayam, John L. Schmalzel and Ronnie K. Miller Electrical & Computer Engineering 201 Mullica Hill Road Glassboro, NJ 08028 (856) 256-5333 http://engineering.rowan.edu/ PERF 95-11 STEERING COMMITTEE MEETING Adams Mark Hotel, Denver, Colorado September 17, 2003

  2. Project 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

  3. Test Platform Design Criteria • Design Challenges • Rigid Frame • Biaxial Loading of test specimen • 30,000 psi (45,000 lbs) along Axis 1 • 15,000 psi (22,500 lbs) along Axis 2 • Low cost

  4. Specimen 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 • Uniaxial and Biaxial Loading • simulates axial and hoop stresses of a pressurized pipeline • Duplicate specimens machined in-house with saw cut defects

  5. Clamping method caused deformation of specimen producing spurious AE data Fixed connection caused bending moments and non-uniform loading of specimen Inability to reach desired load - 13.5ksi (20,000 lbs) max load Additional connections for new clamping brackets create extraneous noise producing false AE data Increased loading capability but still not full desired load – 20ksi (30,000 lbs) max load Construction History: Version 1 Version 2

  6. Frame Load Transducer Specimen Hydraulic Cylinders Specimen Clamping Bracket AE Test Platform Design: Version 3

  7. Why Version 3? • Hydraulic design • Allows for increasing max load to 30 ksi (45,000 lbs) • Controlled loading environment • Negligible noise effects with hydraulic loading • New clamping brackets • Single bracket piece – minimizes noise • Designed to withstand forces exceeding maximum loading specs • 1” Pinned connections to specimens • Allows for movement of specimen to linearize loading • Prevents deformation of specimen at connection

  8. AE Test Platform: Version 3

  9. Summary of Progress • Additional test specimens identical (steel grade and dimensions) to those provided by Shell Oil have been fabricated • Version 3 of the AE test platform with hydraulic loading has been built • The platform has been tested to provided desired load of 45,000 lbs along Axis 1 and 22,500 lbs along Axis 2 • Initial test indicate repeatable loading with minimized extraneous noise

  10. Future Plans • Work with PAC personnel to conduct tests on both in-house and Shell specimens with Version 3 test platform • Parameterize AE signature differences between uni- and bi-axial loading of test specimens • Generate calibration curves and empirical relationships quantifying 1-D and 2-D stress effects • Generate final report summarizing all findings • Provide recommendations for the design of a pressure vessel test platform

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