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Modeling Fatigue Damage Onset and Progression in Composites Using an Element-Based Virtual Crack Closure Technique Combined With the Floating Node MethodA new methodology is proposed to model the onset and propagation of matrix cracks and delaminations in carbon-epoxy composites subject to fatigue loading. An extended interface element, based on the Floating Node Method, is developed to represent delaminations and matrix cracks explicitly in a mesh independent fashion. Crack propagation is determined using an element-based Virtual Crack Closure Technique approach to determine mixed-mode energy release rates, and the Paris-Law relationship to obtain crack growth rate. Crack onset is determined using a stressbased onset criterion coupled with a stress vs. cycle curve and Palmgren-Miner rule to account for fatigue damage accumulation. The approach is implemented in Abaqus/Standard® via the user subroutine functionality. Verification exercises are performed to assess the accuracy and correct implementation of the approach. Finally, it was demonstrated that this approach captured the differences in failure morphology in fatigue for two laminates of identical stiffness, but with layups containing θdeg plies that were either stacked in a single group, or distributed through the laminate thickness.
Document ID
20160012042
Acquisition Source
Langley Research Center
Document Type
Conference Paper
Authors
De Carvalho, Nelson V. (National Inst. of Aerospace Hampton, VA, United States)
Krueger, Ronald (National Inst. of Aerospace Hampton, VA, United States)
Date Acquired
October 7, 2016
Publication Date
September 19, 2016
Subject Category
Composite Materials
Report/Patent Number
NF1676L-23545
Paper No. 1102
Meeting Information
Meeting: American Society for Composite (ASC) Technical Conference
Location: Williamsburg, VA
Country: United States
Start Date: September 19, 2016
End Date: September 22, 2016
Sponsors: American Society for Composites
Funding Number(s)
WBS: WBS
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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