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Material Characterization and Geometric Segmentation of a Composite Structure Using Microfocus X-Ray Computed Tomography Image-Based Finite Element ModelingThis study utilizes microfocus x-ray computed tomography (CT) slice sets to model and characterize the damage locations and sizes in thermal protection system materials that underwent impact testing. ScanIP/FE software is used to visualize and process the slice sets, followed by mesh generation on the segmented volumetric rendering. Then, the local stress fields around several of the damaged regions are calculated for realistic mission profiles that subject the sample to extreme temperature and other severe environmental conditions. The resulting stress fields are used to quantify damage severity and make an assessment as to whether damage that did not penetrate to the base material can still result in catastrophic failure of the structure. It is expected that this study will demonstrate that finite element modeling based on an accurate three-dimensional rendered model from a series of CT slices is an essential tool to quantify the internal macroscopic defects and damage of a complex system made out of thermal protection material. Results obtained showing details of segmented images; three-dimensional volume-rendered models, finite element meshes generated, and the resulting thermomechanical stress state due to impact loading for the material are presented and discussed. Further, this study is conducted to exhibit certain high-caliber capabilities that the nondestructive evaluation (NDE) group at NASA Glenn Research Center can offer to assist in assessing the structural durability of such highly specialized materials so improvements in their performance and capacities to handle harsh operating conditions can be made.
Document ID
20110014984
Document Type
Technical Memorandum (TM)
Authors
Abdul-Aziz, Ali
(NASA Glenn Research Center Cleveland, OH, United States)
Roth, D. J.
(NASA Glenn Research Center Cleveland, OH, United States)
Cotton, R.
(Simpleware Ltd. Exeter, United Kingdom)
Studor, George F.
(NASA Johnson Space Center Houston, TX, United States)
Christiansen, Eric
(NASA Johnson Space Center Houston, TX, United States)
Young, P. C.
(Exeter Univ. United Kingdom)
Date Acquired
August 25, 2013
Publication Date
July 1, 2011
Subject Category
Space Transportation And Safety
Report/Patent Number
E-17680
NASA/TM-2011-217015
Funding Number(s)
CONTRACT_GRANT: NNC07ZRP001N
WBS: WBS 031102.02.03.12.0677.11
Distribution Limits
Public
Copyright
Public Use Permitted.

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