Modeling the initiation and growth of delaminations in composite structures

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Description

A method for modeling the initiation and growth of discrete delaminations in shell-like composite structures is presented. The laminate is divided into two or more sublaminates, with each sublaminate modeled with 4-noded quadrilateral shell elements. A special, 8-noded hex constraint element connects the sublaminates and makes them act as a single laminate until a prescribed failure criterion is attained. When the failure criterion is reached, the connection is broken, and a discrete delamination is initiated or grows. This approach has been implemented in a three-dimensional, finite element code. This code uses explicit time integration, and can analyze shell-like structures subjected ... continued below

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33 p.

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Reedy, E.D. Jr.; Mello, F.J. & Guess, T.R. January 1, 1996.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

A method for modeling the initiation and growth of discrete delaminations in shell-like composite structures is presented. The laminate is divided into two or more sublaminates, with each sublaminate modeled with 4-noded quadrilateral shell elements. A special, 8-noded hex constraint element connects the sublaminates and makes them act as a single laminate until a prescribed failure criterion is attained. When the failure criterion is reached, the connection is broken, and a discrete delamination is initiated or grows. This approach has been implemented in a three-dimensional, finite element code. This code uses explicit time integration, and can analyze shell-like structures subjected to large deformations and complex contact conditions. Tensile, compressive, and shear laminate failures are also modeled. This paper describes the 8-noded hex constraint element used to model the initiation and growth of a delamination, and discusses associated implementation issues. In addition, calculated results for double cantilever beam and end notched flexure specimens are presented and compared to measured data to assess the ability of the present approach to reproduce observed behavior. Results are also presented for a diametrally compressed ring to demonstrate the capacity to analyze progressive failure in a highly deformed composite structure.

Physical Description

33 p.

Notes

OSTI as DE96006199

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  • Other Information: PBD: Jan 1996

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  • Other: DE96006199
  • Report No.: SAND--95-3070
  • Grant Number: AC04-94AL85000
  • DOI: 10.2172/201804 | External Link
  • Office of Scientific & Technical Information Report Number: 201804
  • Archival Resource Key: ark:/67531/metadc665339

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • January 1, 1996

Added to The UNT Digital Library

  • June 29, 2015, 9:42 p.m.

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  • April 14, 2016, 8:40 p.m.

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Reedy, E.D. Jr.; Mello, F.J. & Guess, T.R. Modeling the initiation and growth of delaminations in composite structures, report, January 1, 1996; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc665339/: accessed April 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.