Computationally efficient beam elements for accurate stresses in sandwich laminates and laminated composites with delaminations

Groh, Rainer; Tessler, Alexander

doi:10.1016/j.cma.2017.03.035

Cited by 58 publications

(26 citation statements)

References 40 publications

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“…In [23] [32][33][34][35][36] different strategies have been applied to model the presence of mode II delaminations within a zigzag description of the problem. They are represented as thin and very compliant layers which are added to the regular layers of the system (compliant layer concept).…”

Section: The Most Common Numerical Technique To Analyze Delamination mentioning

confidence: 99%

Mode II dominant fracture of layered composite beams and wide-plates: a homogenized structural approach

Massabò

Darban

2019

Engineering Fracture Mechanics

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Brittle delamination fracture under Mode II dominant conditions in unidirectional composite and layered beams and wide-plates is studied using a homogenized structural model based on a zigzag approach. The model captures the unstable propagation of cracks, snap-back and-through instabilities, the effects of the interaction of multiple cracks on the macrostructural response and of the layered structure on the energy release rate. The layered structure and the delaminations are described by introducing local enrichments, in the form of zigzag functions and cohesive interfaces, to a classical first-order shear deformation plate theory. The model applies to layers with principal material directions parallel to the geometrical axes, depends on only three displacement variables and the solution of specific problems requires only in-plane discretization, for any numbers of layers and delaminations. Closed form solutions are derived for the energy release rate in bi-material beams and applications are presented to homogeneous, bi-material and layered, simply supported and cantilever, bend-beams, with one and two delaminations.

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Section: The Most Common Numerical Technique To Analyze Delamination mentioning

confidence: 99%

Mode II dominant fracture of layered composite beams and wide-plates: a homogenized structural approach

Massabò

Darban

2019

Engineering Fracture Mechanics

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“…In addition to mentioned works in the linear elastic domain, a few attempts have employed ZZ to model delamination damage in multilayer composites [29]. Groh et al used the cohesive zone approach to predict the initiation and propagation of delamination in cross-ply composite beams and compare the predictions with those of experimental test [30].…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Static analysis of highly anisotropic laminated beam using unified zig-zag theory subjected to mechanical and thermal loading

Ghalami-Choobar

Liaghat

Sadighi

et al. 2018

International Journal of Mechanical Sciences

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Highlights  Accurate prediction of stress filed plays an important role in highly anisotropic laminates.  An Unified ZigZag Theory is developed with two primary variable under thermal environment.  Comparison of the model predictions and that of literature indicates good agreement.  The results show the interlaminar continuity(IC) causes more accurate stress in thin laminates

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“…Here, the differences in transverse shear rigidities of each layer, and the average transverse shear rigidities of the entire layup, define the layer-wise ZZ slopes of the in-plane displacement fields. Recent works [19,22,23] have shown the superiority of the RZT ZZ functions in capturing accurate ply level 3D stresses for straight-fiber laminated composites.…”

Section: Introductionmentioning

confidence: 99%

Efficient 3D Stress Capture of Variable-Stiffness and Sandwich Beam Structures

et al. 2019

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Accurate modeling of composite structures is important for their safe application under different loading conditions. To provide accurate predictions of three-dimensional (3D) stress fields in an efficient computational framework, we employ a modeling approach that builds upon the recently developed hierarchical Serendipity Lagrange finite elements. The approach provides Layer-Wise (LW) and Equivalent Single-Layer (ESL) models for analyzing constantand variable-stiffness laminated beam structures. To enhance the capability of the ESL model, two ZigZag (ZZ) functions, namely Murakami's ZZ function (MZZF) and the Refined ZZ theory function (RZT), are implemented. For constant-stiffness laminated and sandwich beams, the RZT ZZ function predicts the structural response more accurately than the MZZF. However, for variable-stiffness laminated structures, the applicability of RZT remains unknown and its accuracy is therefore tested within the present formulation. Results obtained are validated against 3D closed-form and 3D Finite Element (FE) solutions available from the literature. For similar levels of accuracy, significant gains in computational efficiency are achieved over 3D FE and LW models by using the ESL approach with RZT ZZ functions.

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Computationally efficient beam elements for accurate stresses in sandwich laminates and laminated composites with delaminations

Abstract: Computationally efficient beam elements for accurate stresses in sandwich laminates and laminated composites with delaminations. Computer Methods in Applied Mechanics and Engineering,

Cited by 58 publications

References 40 publications

Mode II dominant fracture of layered composite beams and wide-plates: a homogenized structural approach

Mode II dominant fracture of layered composite beams and wide-plates: a homogenized structural approach

Static analysis of highly anisotropic laminated beam using unified zig-zag theory subjected to mechanical and thermal loading

Efficient 3D Stress Capture of Variable-Stiffness and Sandwich Beam Structures

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