A non-local finite element model to assess the compressive strength of composite structures

Compression failure is a mechanism of non-local ruin that depends on the composite structure (layer thickness, load gradient), which makes it a peculiarity. The mechanism has been described and modeled with particular numerical tools in the literature. Only a few researchers modeled the mechanism at...

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Bibliographic Details
Published in:European journal of mechanics, A, Solids A, Solids, 2022-05, Vol.93, p.104494, Article 104494
Main Authors: Bettadahalli Channakeshava, Anil, Grandidier, Jean-Claude
Format: Article
Language:English
Subjects:
Composite structures
Compressive properties
Compressive strength
Elastic properties
Fiber reinforced plastics
Finite element method
Long carbon fiber composites
Long fibers
Material properties
Mathematical models
Mindlin plates
Non-local finite element model
Numerical models
Thickness
Two dimensional models
User elements
Woven composites
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Summary:Compression failure is a mechanism of non-local ruin that depends on the composite structure (layer thickness, load gradient), which makes it a peculiarity. The mechanism has been described and modeled with particular numerical tools in the literature. Only a few researchers modeled the mechanism at a mesoscopic scale, which is limited to UD composites. A homogenized non-local finite element model is proposed in this article. This is similar to Mindlin's II gradient theory to assess the compressive strength of the carbon/epoxy long fiber composite at the mesoscopic/structural scale. The framework of this non-local modeling is more general than that of Drapier et al. (1999) to assess microbuckling phenomenon in UD and woven composites. The developed non-local numerical model has been implemented in User Element (UEL) subroutine for analysis in ABAQUS®, which permits the simulation of the behavior of 2D and 3D cases. A 2D continuous (C1) type super-parametric non-local element (NL U32) is developed for both linear and non-linear (geometry and material) case. Various tests results are presented to validate the non-local FE model for 2D case by comparing the results of the homogenized non-local element with ABAQUS® iso-parametric elements. The classical (elastic and plastic) and non-local material properties (elastic) of the non-local model are identified by comparison to the responses of a Representative Volume Element (RVE) of full heterogeneous microstructures. A comparison of the compressive behavior of UD composite with the results in the bibliography shows the capabilities of this numerical tool. •A homogenized non-local assesses the compressive strength of UD long fiber composite at the structural scale.•Non-local modeling is developed to assess microbuckling phenomenon in UD and woven composites.•The non-local numerical model has been implemented in ABAQUS ®(UEL) for the simulation of the behavior of structures.•A comparison of the UD compressive behavior of with the results in the bibliography shows the capabilities of the model.
ISSN:0997-7538
1873-7285
DOI:10.1016/j.euromechsol.2021.104494