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Experimental Observations of Damage States in Unnotched and Notched 3D Orthogonal Woven Coupons Loaded in TensionThis paper describes a series of unnotched and notched tensile tests on two 3D orthogonal woven architectures loaded in the warp direction. Dogbone specimens were used for the unnotched tests, and open-hole specimens were used for the notched tests. For each architecture and test type, two specimens were loaded under monotonic displacement control to failure, and two specimens were incrementally loaded to failure in five steps. X-ray computed tomography (CT) was used to characterize the woven architecture and defects on each specimen prior to testing. Digital image correlation (DIC) images were obtained from both sides of the specimen throughout the loading and unloading. For the incremental tests, X-ray CT was used to document the damage progression after each load increment. The results for both architectures and test specimens followed a similar pattern where matrix cracks formed perpendicular to the load direction and were primarily located between the stacks of warp tows. Two-piece failure path always occurred perpendicular to the loading direction, along the through-thickness segments of the Z-tows. The combination of stress concentrations due to the specimen geometry, weave geometry, and cut tows created stress concentrations that appear to initiate failure.
Document ID
20210025430
Acquisition Source
Langley Research Center
Document Type
Conference Paper
Authors
Wade C Jackson
(Langley Research Center Hampton, Virginia, United States)
Andrew C Bergan
(Langley Research Center Hampton, Virginia, United States)
Nathaniel W Gardner
(Langley Research Center Hampton, Virginia, United States)
Cheryl A Rose
(Langley Research Center Hampton, Virginia, United States)
Kenneth N Segal
(Goddard Space Flight Center Greenbelt, Maryland, United States)
Nalinda W. Waas
(Wichita State University Wichita, Kansas, United States)
Date Acquired
December 3, 2021
Subject Category
Nonmetallic Materials
Meeting Information
Meeting: AIAA SciTech Forum
Location: San Diego, CA
Country: US
Start Date: January 3, 2022
End Date: January 7, 2022
Sponsors: American Institute of Aeronautics and Astronautics
Funding Number(s)
WBS: 119991.04.02.23
Distribution Limits
Public
Copyright
Portions of document may include copyright protected material.
Technical Review
NASA Peer Committee
Keywords
Woven materials
Composite Materials
X-Ray CT
Damage Progression
Open hole tension
Dogbone Tension
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