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Elastic Plastic Fracture Analysis of an Aluminum COPV LinerOnboard any space-launch vehicle, composite over-wrapped pressure vessels (COPVs) may be utilized by propulsion or environmental control systems. The failure of a COPV has the potential to be catastrophic, resulting in the loss of vehicle, crew or mission. The latest COPV designs have reduced the wall-thickness of the metallic liner to the point where the material strains plastically during operation. At this time, the only method to determine the damage tolerance lifetime (safe-life) of a plastically responding metallic liner is through full-scale COPV testing. Conducting tests costs substantially more and can be far more time consuming than performing an analysis. As a result of this cost, there is a need to establish a qualifying process through the use of a crack growth analysis tool. This paper will discuss fracture analyses of plastically responding metallic liners in COPVs. Uni-axial strain tests have been completed on laboratory specimens to collect elastic-plastic crack growth data. This data has been modeled with the crack growth analysis tool, NASGRO 6.20 to predict the response of laboratory specimens and subsequently the complexity of a COPV.
Document ID
20120014077
Acquisition Source
Johnson Space Center
Document Type
Presentation
Authors
Forth, Scott
(NASA Johnson Space Center Houston, TX, United States)
Gregg, Bradley
(NASA Johnson Space Center Houston, TX, United States)
Bailey, Nathaniel
(Colorado Univ. CO, United States)
Date Acquired
August 26, 2013
Publication Date
August 13, 2012
Subject Category
Composite Materials
Report/Patent Number
JSC-CN-26630
Meeting Information
Meeting: Composite Conference 2012
Location: Las Cruces, NM
Country: United States
Start Date: August 13, 2012
End Date: August 17, 2012
Funding Number(s)
WBS: WBS 401769.06.03.07.02.01
Distribution Limits
Public
Copyright
Public Use Permitted.
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