On the Endurance Limit of Fiberglass Pipes Using Acoustic Emission

[+] Author and Article Information
Guillermo Ramirez

Department of Civil Engineering, University of Texas Arlington, Arlington, TX 76019

Michael D. Engelhardt, Timothy J. Fowler

 The University of Texas at Austin, Austin, TX

J. Pressure Vessel Technol 128(3), 454-461 (Nov 18, 2005) (8 pages) doi:10.1115/1.2218351 History: Received July 15, 2003; Revised November 18, 2005

This paper proposes a method for determining endurance limits to leakage for fiberglass pipes under internal pressure using acoustic emission signals and static pressure tests. Results are presented from a series of cyclic internal pressure tests performed on fiberglass pipes fabricated according to ASME RTP-1 (1989) recommendations. The specimens were 8in.(20.32cm) internal diameter and 5ft(1.525m) long. The construction layup consisted of an internal corrosion barrier followed by several layers of continuous filament wound glass. A state of pure hoop stress was imposed via an internal pressure system that allowed free axial movement of the pipe. The purpose of the tests was to evaluate current design procedures and to assess the capabilities of acoustic emission (AE) monitoring to detect damage and to predict the leakage pressure for the pipes. Twenty-four specimens were tested to failure with AE monitoring. The results of these tests are presented, including data on the measured cyclic life of the specimens, comparisons to the static leakage capacity, and the effectiveness of AE in determining damage induced by cyclic loading.

Copyright © 2006 by American Society of Mechanical Engineers
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Figure 1

Specimen cross section

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Figure 2

Seal system for pressure tests

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Figure 3

Leak detection setup

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Figure 4

Summary of test results showing cycles and pressure to failure

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Figure 5

Determination of HI from AE records

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Figure 6

AE “knee” for all tested specimens

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Figure 7

Recorded pressure and strain at RAM knee

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Figure 8

Difference between RAM knee and leakage

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Figure 9

Pressure above 2nd AE knee versus cycles to failure




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