NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Acoustic Emission of Large PRSEUS Structures (Pultruded Rod Stitched Efficient Unitized Structure)In the role of structural health monitoring (SHM), Acoustic Emission (AE) analysis is being investigated as an effective method for tracking damage development in large composite structures under load. Structures made using Pultruded Rod Stitched Efficient Unitized Structure (PRSEUS) for damage tolerant, light, and economical airframe construction are being pursued by The Boeing Company and NASA under the Environmentally Responsible Aircraft initiative (ERA). The failure tests of two PRSEUS substructures based on the Boeing Hybrid Wing Body fuselage concept were conducted during third quarter 2011 and second quarter 2015. One fundamental concern of these tests was determining the effectiveness of the stitched integral stiffeners to inhibit damage progression. By design, severe degradation of load carrying capability should not occur prior to Design Ultimate Load (DUL). While minor damage prior to DUL was anticipated, the integral stitching should not fail since this would allow a stiffener-skin delamination to progress rapidly and alter the transfer of load into the stiffeners. In addition, the stiffeners should not fracture because they are fundamental to structural integrity. Getting the best information from each AE sensor is a primary consideration because a sparse network of sensors is implemented. Sensitivity to stiffener-contiguous degradation is supported by sensors near the stiffeners, which increases the coverage per sensor via AE waveguide actions. Some sensors are located near potentially critical areas or "critical zones" as identified by numerical analyses. The approach is compared with the damage progression monitored by other techniques (e.g. ultrasonic C-scan).
Document ID
20170001560
Document Type
Conference Paper
Authors
Horne, Michael R.
(National Inst. of Aerospace Associates Hampton, VA, United States)
Juarez, Peter D.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
February 13, 2017
Publication Date
September 19, 2016
Subject Category
Aircraft Design, Testing And Performance
Report/Patent Number
NF1676L-24893
Meeting Information
Annual Technical Conference of the American Society for Composites(Williamsburg, VA)
Funding Number(s)
WBS: WBS 338881.02.22.07.01.01
Distribution Limits
Public
Copyright
Public Use Permitted.

Available Downloads

NameType 20170001560.pdf STI
No Preview Available