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Longitudinally Jointed Edge-Wise Compression HoneyComb Composite Sandwich Coupon Testing And Fe Analysis: Three Methods of Strain Measurement, And ComparisonThree distinct strain measurement methods (i.e., foil resistance strain gages, fiber optic strain sensors, and a three-dimensional digital image photogrammetry that gives full field strain and displacement measurements) were implemented to measure strains on the back and front surfaces of a longitudinally jointed curved test article subjected to edge-wise compression testing, at NASA Goddard Space Flight Center, according to ASTM C364. The pre-test finite element analysis (FEA) was conducted to assess ultimate failure load and predict strain distribution pattern throughout the test coupon. The predicted strain pattern contours were then utilized as guidelines for installing the strain measurement instrumentations. The foil resistance strain gages and fiber optic strain sensors were bonded on the specimen at locations with nearly the same analytically predicted strain values, and as close as possible to each other, so that, comparisons between the measured strains by strain gages and fiber optic sensors, as well as the three-dimensional digital image photogrammetric system are relevant. The test article was loaded to failure (at ~167 kN), at the compressive strain value of ~10,000 micro epsilon. As a part of this study, the validity of the measured strains by fiber optic sensors is examined against the foil resistance strain gages and the three-dimensional digital image photogrammetric data, and comprehensive comparisons are made with FEA predictions.
Document ID
20130011719
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Farrokh, Babak (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Rahim, Nur Aida Abul (Luna Innovations, Inc. United States)
Segal, Ken (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Fan, Terry (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Jones, Justin (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Hodges, Ken (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Mashni, Noah (Luna Innovations, Inc. United States)
Garg, Naman (Luna Innovations, Inc. United States)
Sang, Alex (Luna Innovations, Inc. United States)
Date Acquired
August 27, 2013
Publication Date
May 5, 2013
Subject Category
Composite Materials
Report/Patent Number
GSFC.CP.7538.2013
Meeting Information
Meeting: SAMPE 2013 Conference
Location: Long Beach, CA
Country: United States
Start Date: May 6, 2013
End Date: May 9, 2013
Sponsors: Society for the Advancement of Materials and Process Engineering
Distribution Limits
Public
Copyright
Public Use Permitted.

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