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Stiffness prediction of damaged laminates based on the concept of laminate effective stiffness
Luleå University of Technology, Sweden.
RISE, Swerea, SICOMP.
2016 (English)In: ECCM 2016 - Proceeding of the 17th European Conference on Composite Materials, European Conference on Composite Materials, ECCM , 2016Conference paper, Published paper (Refereed)
Abstract [en]

The concept of the effective stiffness of a unidirectional layer with intralaminar cracks is revisited performing 3-D FEM parametric analysis of symmetric and balanced laminates with damaged 90-layer. The effective stiffness of the damaged layer is obtained from the difference between damaged and undamaged laminate stiffness. The effective longitudinal modulus and Poisson's ratio of the layer are equal to their initial values. A very simple expression for the effective transverse modulus change with normalized crack density has sufficient accuracy and generality to be used in laminate theory to predict macroscopic elastic property change with crack density in laminates with very different lay-ups and made of different UD composites.

Place, publisher, year, edition, pages
European Conference on Composite Materials, ECCM , 2016.
Keywords [en]
Crack opening displacement, Effective transverse modulus, FEM, Transverse cracking, Composite materials, Cracks, Finite element method, Laminated composites, Stiffness, Crack opening displacements, Effective stiffness, Longitudinal modulus, Parametric -analysis, Stiffness prediction, Transverse modulus, Unidirectional layers, Laminates
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-42165Scopus ID: 2-s2.0-85018536461ISBN: 9783000533877 (print)OAI: oai:DiVA.org:ri-42165DiVA, id: diva2:1384323
Conference
17th European Conference on Composite Materials, ECCM 2016, 26 June 2016 through 30 June 2016
Note

Funding details: VINNOVA; Funding details: 2014- 00882; Funding text 1: This work is performed within the Swedish Aeronautical Research Program (NFFP), Project 2014- 00882, in co-operation with GKN Aerospace Sweden AB and jointly funded by the Swedish Armed Forces, Swedish Defence Materiel Administration and the Swedish Governmental Agency for Innovation Systems.

Available from: 2020-01-09 Created: 2020-01-09 Last updated: 2020-01-09Bibliographically approved

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