NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Characterizing Face Sheet/Core Disbonding Using the Single Cantilever Beam Test: Results from an International Round RobinTest results from an international round robin are presented. The single cantilever beam (SCB) test was used to characterize face sheet/core disbonding in sandwich components in an effort to help standardization. Each of the seven participating laboratories performed a set of five baseline tests using the same protocol, however, using their own specific equipment. In addition, each laboratory performed two sets of tests with altered tests conditions which included using a test fixture with a translating carriage and performing the tests with different loading and unloading speeds. The orientation of the disbond front with respect to the honeycomb core cells was varied and the effect on the fracture toughness was also studied. Additional factors that could influence test results were investigated, such as the use of a saw cut starter disbond as an alternative to Teflon® release film, and the effects of using a face sheet doubler to increase the bending stiffness. For each set of tests, summary results such as load/displacements plots, observed disbond growth location and calculated energy release rates are reported and a comparison of results between labs is presented. Critical strain energy release rate measurements from SCB tests are also compared with measurements made from an alternative test, namely the double cantilever beam with uneven bending moments (DCB-UBM) test, which has been studied extensively at the Technical University of Denmark and proposed as a mixed-mode test standard. A set of recommendations are made with respect to improving the SCB test and a path to standardization is presented.
Document ID
20240001178
Acquisition Source
Langley Research Center
Document Type
Technical Memorandum (TM)
Authors
Ronald Krueger
(National Institute of Aerospace Hampton, Virginia, United States)
James G Ratcliffe
(Langley Research Center Hampton, United States)
Daniel O. Adams
(University of Utah Salt Lake City, Utah, United States)
Zhi-Ming Chen
(Federal Aviation Administration Washington, United States)
Waruna Seneviratne
(Wichita State University Wichita, Kansas, United States)
Chris Oline
(Wichita State University Wichita, Kansas, United States)
Christian Berggreen
(Technical University of Denmark Kongens Lyngby, Denmark)
Francesco Attanasio
(Technical University of Denmark Kongens Lyngby, Denmark)
Vishnu Saseendran
(Technical University of Denmark Kongens Lyngby, Denmark)
Sönke-Class Fimmen
(Airbus (Germany) Hamburg, Germany)
Ralf Schäuble
(Fraunhofer Institute for Microstructure of Materials and Systems Halle, Germany)
Yannick Albertone
( DuPont, Geneva, Switzerland Isenburg, Germany)
Date Acquired
January 25, 2024
Publication Date
February 1, 2024
Subject Category
Structural Mechanics
Funding Number(s)
WBS: 664817.02.07.03.03.04
CONTRACT_GRANT: 80LARC17C0004
Distribution Limits
Public
Copyright
Portions of document may include copyright protected material.
Technical Review
NASA Peer Committee
No Preview Available