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Research Papers: Materials and Fabrication

Influence of Elevated Temperature on the Acoustic Emission Evaluation of FRP Vessels Through Internal Fluid Pressure Tests

[+] Author and Article Information
Guillermo Ramirez1

Department of Civil and Environmental Engineering, University of Texas at Arlington, P.O. Box 19308, Arlington, TX 76019-0308willy@uta.edu

Paul H. Ziehl

Department of Civil and Environmental Engineering, University of South Carolina, 300 Main Street, Columbia, SC 29208ziehl@engr.sc.edu

Timothy J. Fowler2

Department of Civil Engineering, Ferguson Structural Engineering Laboratory, University of Texas at Austin, 10100 Burnet Road, Building No. 177, Austin, TX 78731fowlermarietim@hughes.net

1

Corresponding author.

2

Retired.

J. Pressure Vessel Technol 131(5), 051401 (Jul 24, 2009) (6 pages) doi:10.1115/1.3122771 History: Received April 25, 2008; Revised July 12, 2008; Published July 24, 2009

A research program evaluating the effect of elevated temperature in the acoustic emission testing of fiberglass vessels was completed recently. The program aimed at evaluating the current ASME provisions that require acoustic emission testing for Class II vessels be carried out at operating temperature in the event that the operating temperature exceeds 49°C (120°F). Lack of data from fiber reinforced polymer vessels and/or components that have been subjected to acoustic emission evaluation at elevated temperature has resulted in speculation regarding the appropriateness of conducting the acoustic emission evaluation at elevated temperature. To address these issues, an experimental investigation was conducted on representative coupon specimens and pressurized cylindrical specimens at differing temperatures. The results from the coupon tests were presented in a previous publication. This paper will present the results of the cylindrical specimens and compare them to the coupon specimens drawing the final conclusions from the overall results of the program. The results from this study resulted in changes in the body of the ASME code for testing pressure vessels with acoustic emission at temperature.

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Copyright © 2009 by American Society of Mechanical Engineers
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References

Figures

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Figure 3

Frame for pressure testing figure and seal plate with immersion heater

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Figure 4

Geometry of pipe specimen

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Figure 5

Internal pressures at test termination

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Figure 6

Hoop strain at test termination

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Figure 7

Onset of significant AE (as percentage of ultimate internal pressure)

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Figure 8

(a) Specimen 8084 before test termination 60°C(140°F); (b) specimen geometry after test at 60°C(140°F)

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Figure 1

Pipe specimens before testing

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