Finite Element Interface Technology for Modeling Delamination Growth in Composite Structures

Abstract A three-dimensional (3D) beam finite element model was developed to investigate the torsional stiffness of a twisted steel-reinforced cord-rubber belt structure. The present 3D beam element takes into account the coupled extension, bending, and twisting deformations characteristic of the complex behavior of cord-rubber composite structures. The extension-twisting coupling due to the twisted nature of the cords was also considered in the finite element model. The results of torsional stiffness obtained from the finite element analysis for twisted cords and the two-ply steel cord-rubber belt structure are compared to the experimental data and other alternate solutions available in the literature. The effects of cord orientation, anisotropy, and rubber core surrounding the twisted cords on the torsional stiffness properties are presented and discussed.

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Behaviour of Axially Loaded Composite Wall Panel by Using Finite Element Analysis

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.815.49 ◽

2015 ◽

Vol 815 ◽

pp. 49-53

Author(s):

Nur Fitriah Isa ◽

Mohd Zulham Affandi Mohd Zahid ◽

Liyana Ahmad Sofri ◽

Norrazman Zaiha Zainol ◽

Muhammad Azizi Azizan ◽

...

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Composite Structures ◽

Element Analysis ◽

Steel Sheets ◽

Linear Behavior ◽

Non Linear ◽

Composite Wall ◽

Experimental Values ◽

Civil Engineering Infrastructure

In order to promote the efficient use of composite materials in civil engineering infrastructure, effort is being directed at the development of design criteria for composite structures. Insofar as design with regard to behavior is concerned, it is well known that a key step is to investigate the influence of geometric differences on the non-linear behavior of the panels. One possible approach is to use the validated numerical model based on the non-linear finite element analysis (FEA). The validation of the composite panel’s element using Trim-deck and Span-deck steel sheets under axial load shows that the present results have very good agreement with experimental references. The developed finite element (FE) models are found to reasonably simulate load-displacement response, stress condition, giving percentage of differences below than 15% compared to the experimental values. Trim-deck design provides better axial resistance than Span-deck. More concrete in between due to larger area of contact is the factor that contributes to its resistance.

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Finite element analysis on enhanced C-channel connectors in SCS sandwich composite structures

Structures ◽

10.1016/j.istruc.2021.01.050 ◽

2021 ◽

Vol 30 ◽

pp. 818-837

Author(s):

Chang-Hui Li ◽

Jia-Bao Yan ◽

Hui-Ning Guan

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Composite Structures ◽

Sandwich Composite ◽

Element Analysis

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Vibration-based delamination evaluation in GFRP composite beams using ANN

Polymers and Polymer Composites ◽

10.1177/09673911211003399 ◽

2021 ◽

pp. 096739112110033

Author(s):

TG Sreekanth ◽

M Senthilkumar ◽

S Manikanta Reddy

Keyword(s):

Finite Element ◽

Natural Frequency ◽

Composite Structures ◽

Composite Beams ◽

Vibration Characteristics ◽

Mode Shapes ◽

Aviation Industry ◽

Frequency Data ◽

Fiber Reinforced ◽

Back Propagation Algorithm

Delamination is definitely an important topic in the area of composite structures as it progressively worsens the mechanical performance of fiber-reinforced polymer composite structures in its service period. The detection and severity analysis of delaminations in engineering areas like the aviation industry is vital for safety and economic considerations. The existence of delaminations varies the vibration characteristics such as natural frequencies, mode shapes, etc. of composites and hence this indication can be effectively used for locating and quantifying the delaminations. The changes in vibration characteristics are considered as inputs for the inverse problem to determine the location and size of delaminations. In this paper Artificial Neural Network (ANN) is used for delamination evaluationof glass fiber-reinforced composite beams using natural frequency as typical vibration parameter. The Finite Element Analysis is used for generating the required dataset for ANN. The frequency-based delamination prediction technique is validated by finite element models and experimental modal analysis. The results indicate that the ANN-based back propagation algorithm can predict the location and size of delaminations in composites with good accuracy for numerical natural frequency data but the accuracy is comparitivelyless for experimental natural frequency data.

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