NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Collections About News Help Login
Back to Results
Intralaminar and Interlaminar Progressive Failure Analysis of Composite Panels with Circular CutoutsA progressive failure methodology is developed and demonstrated to simulate the initiation and material degradation of a laminated panel due to intralaminar and interlaminar failures. Initiation of intralaminar failure can be by a matrix-cracking mode, a fiber-matrix shear mode, and a fiber failure mode. Subsequent material degradation is modeled using damage parameters for each mode to selectively reduce lamina material properties. The interlaminar failure mechanism such as delamination is simulated by positioning interface elements between adjacent sublaminates. A nonlinear constitutive law is postulated for the interface element that accounts for a multi-axial stress criteria to detect the initiation of delamination, a mixed-mode fracture criteria for delamination progression, and a damage parameter to prevent restoration of a previous cohesive state. The methodology is validated using experimental data available in the literature on the response and failure of quasi-isotropic panels with centrally located circular cutouts loaded into the postbuckling regime. Very good agreement between the progressive failure analyses and the experimental results is achieved if the failure analyses includes the interaction of intralaminar and interlaminar failures.
Document ID
20030005458
Acquisition Source
Langley Research Center
Document Type
Preprint (Draft being sent to journal)
Authors
Goyal, Vinay K. (Virginia Polytechnic Inst. and State Univ. Blacksburg, VA United States)
Jaunky, Navin (Institute for Computer Applications in Science and Engineering Hampton, VA United States)
Johnson, Eric R. (Virginia Polytechnic Inst. and State Univ. Blacksburg, VA United States)
Ambur, Damodar (NASA Langley Research Center Hampton, VA United States)
Date Acquired
September 7, 2013
Publication Date
January 1, 2002
Subject Category
Composite Materials
Report/Patent Number
AIAA Paper 2002-1745
Meeting Information
Meeting: 43rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials
Location: Denver, CO
Country: United States
Start Date: April 22, 2002
End Date: April 25, 2002
Sponsors: American Helicopter Society, Inc., American Society for Composites, American Society of Civil Engineers, American Society of Mechanical Engineers, American Inst. of Aeronautics and Astronautics
Funding Number(s)
CONTRACT_GRANT: NCC1-398
Distribution Limits
Public
Copyright
Public Use Permitted.

Related Records

There are no records associated with this record.
No Preview Available