1 / 10

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

jason-velasquez
Télécharger la présentation

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 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

More Related