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Title: Results obtained during acoustic emission monitoring of proof testing of a large Kevlar/epoxy rocket motor case

Abstract

A total of 15 acoustic emission (AE) sensors were used to monitor a large Kevlar 49/epoxy rocket motor case during proof cycles to successively higher levels. Fourteen of the sensors were placed on the composite surface and one sensor was coupled to a stainless steel waveguide which penetrated the full length of the inside of the hydraulically pressurized motor case. To reduce signal propagation losses, the bandpass was chosen to be 5 to 10 kHz. In addition to an Acoustic Emission Technology (AET) 5000 system, Hewlett Packard 3400 A root-mean-square voltmeters, and a 1010 Biomation transient recorder were used to record AE data. The AET system measured rise time, event duration, peak amplitude, and energy (calculated from event duration and peak amplitude) for each AE event. The main purpose of this paper is to present and discuss the AE data obtained by hand post-processing of event listings generated for each proof cycle of the AE data taped by the 5000 system during the test. Real AE signal propagation losses are compared to the losses from Pentel pencil-lead breaks. We present first-hit sensor data for events with high amplitude, energy, and event duration. This data indicated that a certain area ofmore » the composite case is the potential region of failure.« less

Authors:
Publication Date:
Research Org.:
Lawrence Livermore National Lab., CA (USA)
OSTI Identifier:
6223300
Report Number(s):
UCRL-88272; CONF-830755-1
ON: DE83011275
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: 1. international symposium on acoustic emmision from composites, San Francisco, CA, USA, 1 Jul 1983
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; ROCKET ENGINES; ACOUSTIC EMISSION TESTING; ARAMIDS; EPOXIDES; PULSE RISE TIME; WAVEGUIDES; ACOUSTIC TESTING; ENGINES; MATERIALS; MATERIALS TESTING; NONDESTRUCTIVE TESTING; ORGANIC COMPOUNDS; ORGANIC OXYGEN COMPOUNDS; PETROCHEMICALS; PETROLEUM PRODUCTS; PLASTICS; SYNTHETIC MATERIALS; TESTING; TIMING PROPERTIES; 420500* - Engineering- Materials Testing

Citation Formats

Hamstad, M A. Results obtained during acoustic emission monitoring of proof testing of a large Kevlar/epoxy rocket motor case. United States: N. p., 1982. Web.
Hamstad, M A. Results obtained during acoustic emission monitoring of proof testing of a large Kevlar/epoxy rocket motor case. United States.
Hamstad, M A. Wed . "Results obtained during acoustic emission monitoring of proof testing of a large Kevlar/epoxy rocket motor case". United States.
@article{osti_6223300,
title = {Results obtained during acoustic emission monitoring of proof testing of a large Kevlar/epoxy rocket motor case},
author = {Hamstad, M A},
abstractNote = {A total of 15 acoustic emission (AE) sensors were used to monitor a large Kevlar 49/epoxy rocket motor case during proof cycles to successively higher levels. Fourteen of the sensors were placed on the composite surface and one sensor was coupled to a stainless steel waveguide which penetrated the full length of the inside of the hydraulically pressurized motor case. To reduce signal propagation losses, the bandpass was chosen to be 5 to 10 kHz. In addition to an Acoustic Emission Technology (AET) 5000 system, Hewlett Packard 3400 A root-mean-square voltmeters, and a 1010 Biomation transient recorder were used to record AE data. The AET system measured rise time, event duration, peak amplitude, and energy (calculated from event duration and peak amplitude) for each AE event. The main purpose of this paper is to present and discuss the AE data obtained by hand post-processing of event listings generated for each proof cycle of the AE data taped by the 5000 system during the test. Real AE signal propagation losses are compared to the losses from Pentel pencil-lead breaks. We present first-hit sensor data for events with high amplitude, energy, and event duration. This data indicated that a certain area of the composite case is the potential region of failure.},
doi = {},
url = {https://www.osti.gov/biblio/6223300}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1982},
month = {12}
}

Conference:
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