1 / 30

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 August 22, 2002 – March 31, 2003. Joseph Oagaro, Shreekanth Mandayam, John L. Schmalzel and Ronnie K. Miller. Electrical & Computer Engineering 201 Mullica Hill Road

tara-mcleod
Download Presentation

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

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Development of an Acoustic Emission Test Platform with a Biaxial Stress Loading System Progress Report for the Period August 22, 2002 – March 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 Sheraton Seattle Hotel & Towers, Seattle, Washington April 16, 2003

  2. Presentation Outline • Project Objectives • Personnel • Test Specimens • AE Training and Quality Assurance • AE Test Platforms (Design, Development and Results) • Version 1 • Version 2 • Version 3 • Summary and Future Work

  3. 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

  4. Major 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

  5. Data Acquisition Signal Conditioning Display/ User Interface Conceptual Design: Test Platform AE Sensors Specimen Load Cell Simulated Defect Double Acting Hydraulic Ram

  6. Test Platform Design Criteria • Design Challenges • Rigid Frame • Biaxial Loading of test specimen • 30,000 psi (45,000 lbs) 1st Dimension • 15,000 psi (22,500 lbs) 2nd Dimension • Short manufacturing time • Low cost

  7. Project Personnel • Rowan • Dr. Shreekanth Mandayam (PI), Dr. John Schmalzel (Co-PI), Joe Oagaro (Senior ECE), Dan Edwards (Senior ME), John Ludes (Junior ECE), Terry Lott (Junior ME) • PAC • Dr. Ronnie K. Miller

  8. Specimen Fabrication • Provided by Shell • 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

  9. In-House Specimen Fabrication • ASTM 836 steel specimens • Saw-cut defects (80% deep, 2.5” long) Rowan Water Jet Machining Center

  10. Collaboration with PAC • Rowan personnel were trained on AE system at PAC on August 22, 2002 • 4-Channel AE system was delivered to Rowan on September 26, 2002 • Rowan personnel were trained on system by PAC • Project meeting on January 30, 2003 for reviewing test results; design and test modifications suggested

  11. AE Test Platforms • Version 1 • Prototype Design • 13.5ksi (20,000 lbs) max load • Version 2 • Clamping Bracket Modification • 20,000ksi (30,000 lbs) max load • Version 3 • Hydraulic Rams • Full Desired load of 30ksi (45,000 lbs)

  12. Frame Load Transducer Specimen Loading Screws Specimen Clamping Bracket AE Test Platform: Version 1

  13. FEM Analysis COSMOSWorks FEM analysis of clamping block

  14. AE Test Station Construction: Version 1 1/24/2003

  15. Testing Parameters • Specimen was preloaded to: • Axis 1: 10,000 lbs • Axis 2: 20,000 lbs • AE sensors activated and test run for approximately 30 minutes • Crack Depth 60%, Length 2.5”

  16. AE Results: Version 1

  17. AE Results: Version 1

  18. AE Results: Version 1

  19. AE Location: Version 1

  20. Design Limitations: Version 1 • Clamping method caused deformation of specimen producing spurious AE data. • Location View shows AE Hit concentration in proximity of clamping brackets • Connection from load cell to specimen fixed, causing bending moment and non-uniform loading of specimen • Inability to reach desired load

  21. Frame Load Transducer Specimen Loading Screws Specimen Clamping Bracket AE Test Platform: Version 2 • New Clamping Brackets • Pinned connections for ensure uniform loading • Max load of 30,000 lbs

  22. Testing Parameters • AE sensors active throughout loading of specimen • Specimen loaded in steps of 2000 lbs up to: • Axis 1: 30,000 lbs • Axis 2: 15,000 lbs • Signal processing to remove spurious data during loading of test platform

  23. AE Results: Version 2

  24. AE Results: Version 2

  25. AE Results: Version 2

  26. AE Location: Version 2 COSMOSWorks FEM Model

  27. Why Version 3? • Hydraulic design • Allows for increasing max load to 30 ksi • Controlled loading environment • New clamping bracket • Single pin piece – minimizes noise

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

  29. Summary of Progress • Rowan personnel have been trained in AE testing techniques by PAC • Two versions of the biaxial loading test platform constructed – fabrication of third and final version underway • AE tests conducted on test specimens fabricated in-house; specimens provided by Shell will be tested on Version 3 • AE signatures obtained for 1-D and 2-D loading of the test specimens indicate appreciable differences, demonstrating proof-of-concept of the technique • Continuous interaction with PAC for quality assurance.

  30. Future Plans • Develop Version 3 of the test platform withhydraulic loading • Conduct tests on specimens provided by Shell • 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 design of a pressure vessel test platform

More Related