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Full-field Deformation Measurement Techniques for a Rotating Composite ShaftTest methods were developed to view global and local deformation in a composite tube during a test in which the tube is rotating at speeds and torques relevant to rotorcraft shafts. Digital image correlation (DIC) was used to provide quantitative displacement measurements during the tests. High speed cameras were used for the DIC measurements in order to capture images at sufficient frame rates and with sufficient resolution while the tube was rotating at speeds up to 5,000 rpm. Surface displacement data was resolved into cylindrical coordinates in order to measure rigid body rotation and global deformation of the tube. Tests were performed on both undamaged and impact damaged tubes in order to evaluate the capability to detect local deformation near an impact damaged site. Measurement of radial displacement clearly indicated a local buckling deformation near the impacted site in both dynamic and static tests. X-ray computed tomography (CT) was used to investigate variations in fiber architecture within the composite tube and to detect impact damage. No growth in the impact damage area was observed by DIC during dynamic testing or by x-ray CT in post test inspection of the composite tube.
Document ID
20120014213
Acquisition Source
Glenn Research Center
Document Type
Conference Paper
Authors
Kohlman, Lee W.
(NASA Glenn Research Center Cleveland, OH, United States)
Ruggeri, Charles R.
(NASA Glenn Research Center Cleveland, OH, United States)
Martin, Richard E.
(Cleveland State Univ. Cleveland, OH, United States)
Roberts, Gary D.
(NASA Glenn Research Center Cleveland, OH, United States)
Handschuh, Robert F.
(NASA Glenn Research Center Cleveland, OH, United States)
Roth, Don J.
(NASA Glenn Research Center Cleveland, OH, United States)
Date Acquired
August 26, 2013
Publication Date
May 1, 2012
Subject Category
Composite Materials
Report/Patent Number
E-18403
Meeting Information
Meeting: American Helicopter Society 68th Annual Forum
Location: Fort Worth, TX
Country: United States
Start Date: May 1, 2012
End Date: May 3, 2012
Distribution Limits
Public
Copyright
Other

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