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Mode I Cohesive Law Characterization of Through-Crack Propagation in a Multidirectional LaminateA method is proposed and assessed for the experimental characterization of through-the-thickness crack propagation in multidirectional composite laminates with a cohesive law. The fracture toughness and crack opening displacement are measured and used to determine a cohesive law. Two methods of computing fracture toughness are assessed and compared. While previously proposed cohesive characterizations based on the R-curve exhibit size effects, the proposed approach results in a cohesive law that is a material property. The compact tension specimen configuration is used to propagate damage while load and full-field displacements are recorded. These measurements are used to compute the fracture toughness and crack opening displacement from which the cohesive law is characterized. The experimental results show that a steady-state fracture toughness is not reached. However, the proposed method extrapolates to steady-state and is demonstrated capable of predicting the structural behavior of geometrically-scaled specimens.
Document ID
20140016391
Acquisition Source
Langley Research Center
Document Type
Conference Paper
Authors
Bergan, Andrew C. (NASA Langley Research Center Hampton, VA, United States)
Davila, Carlos G. (NASA Langley Research Center Hampton, VA, United States)
Leone, Frank A. (NASA Langley Research Center Hampton, VA, United States)
Awerbuch, Jonathan (Drexel Univ. Philadelphia, PA, United States)
Tan, Tein-Min (Drexel Univ. Philadelphia, PA, United States)
Date Acquired
November 17, 2014
Publication Date
September 8, 2014
Subject Category
Composite Materials
Report/Patent Number
NF1676L-18222
Meeting Information
Meeting: American Society for Composites Technical Conference
Location: La Jolla, CA
Country: United States
Start Date: September 8, 2014
End Date: September 10, 2014
Sponsors: American Society for Composites, American Society for Testing and Materials, Japan Society for Composite Materials
Funding Number(s)
WBS: WBS 736466.01.08.07.06.01
Distribution Limits
Public
Copyright
Public Use Permitted.

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