NDLI: Three-dimensional analysis of a postbuckled embedded delamination

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Three-dimensional analysis of a postbuckled embedded delamination

Content Provider	NASA Technical Reports Server (NTRS)
Author	Whitcomb, John D.
Copyright Year	1988
Description	Delamination growth caused by local buckling of a delaminated group of plies was investigated. Delamination growth was assumed to be governed by the strain energy release rates, G(1), G(2) and G(3). The strain energy release rates were calculated using a geometrically nonlinear three-dimensional finite element analysis. The program is described and several checks of the analysis are discussed. Based on a limited parametric study, the following conclusions were reached: (1) the problem is definitely mixed mode (in some cases G(1) is larger than G(2), for other cases the opposite is true); (2) in general, there is a large gradient in the strain energy release rates along the delamination front; (3) the locations of maximum G(1) and G(2) depend on the delamination shape and the applied strain; (4) the mode 3 component was negligible for all cases considered; and (5) the analysis predicted that parts of the delamination would overlap. The results presented did not impose contact constraints to prevent overlapping. Further work is needed to determine the effects of allowing the overlapping.
File Size	1025063
Page Count	28
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19880017300
Archival Resource Key	ark:/13960/t55f3qb2g
Language	English
Publisher Date	1988-07-01
Access Restriction	Open
Subject Keyword	Structural Mechanics Finite Element Method Strain Energy Release Rate Compression Loads Delaminating Laminates Buckling Crack Propagation Structural Analysis Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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