NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Collections About News Help Login
Back to Results
An Irreversible Constitutive Law for Modeling the Delamination Process Using Interface ElementsAn irreversible constitutive law is postulated for the formulation of interface elements to predict initiation and progression of delamination in composite structures. An exponential function is used for the constitutive law such that it satisfies a multi-axial stress criterion for the onset of delamination, and satisfies a mixed mode fracture criterion for the progression of delamination. A damage parameter is included to prevent the restoration of the previous cohesive state between the interfacial surfaces. To demonstrate the irreversibility capability of the constitutive law, steady-state crack growth is simulated for quasi-static loading-unloading cycle of various fracture test specimens.
Document ID
20020080782
Acquisition Source
Langley Research Center
Document Type
Contractor Report (CR)
Authors
Goyal, Vinay K. (Virginia Polytechnic Inst. and State Univ. Blacksburg, VA United States)
Johnson, Eric R. (Virginia Polytechnic Inst. and State Univ. Blacksburg, VA United States)
Davila, Carlos G. (NASA Langley Research Center Hampton, VA United States)
Jaunky, Navin (Institute for Computer Applications in Science and Engineering Hampton, VA United States)
Bushnell, Dennis M.
Date Acquired
September 7, 2013
Publication Date
August 1, 2002
Subject Category
Fluid Mechanics And Thermodynamics
Report/Patent Number
NASA/CR-2002-211758
ICASE-2002-25
NAS 1.26:211758
Funding Number(s)
CONTRACT_GRANT: NAS1-97046
PROJECT: RTOP 505-90-52-01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

Related Records

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