Modeling of Phases Adhesion in Composite Materials Based on Spring Finite Element with Zero Length

2018 ◽  
Vol 780 ◽  
pp. 3-9 ◽  
Author(s):  
Alexander Pavlovich Sokolov ◽  
Vitaliy Nikolaevich Schetinin
Keyword(s):  
Finite Element ◽  
Elastic Properties ◽  
Three Dimensional ◽  
Adhesive Layer ◽  
Variable Stiffness ◽  
Element Model ◽  
Adhesive Contact ◽  
Reinforced Composites ◽  
New Approach ◽  
Spring Element

A new numerical method for homogenization of elastic properties of dispersedly-reinforced composites was presented. The method takes into account special model of adhesive contact. Homogenization of properties was performed by averaging the solutions of boundary value problems on representative volume cell (RVC) using the finite element method (FEM). A new approach of calculation of components of effective tensor of elastic moduli was proposed. A heterogeneous finite element model with elements of two types was built: three-dimensional tetrahedron elements for every phases and spring element with zero-length for adhesion layer with zero-thickness. The results of homogenization of elastic properties of dispersedly-reinforced composites with variable stiffness of the adhesive layer between phases were obtained and analyzed. The homogenization results were compared with the available experimental data.

Finite Element Analysis of Stiffness of Steel Plate with a Rectangular Cutout Bonded by Composite Patches

2013 ◽  
Vol 377 ◽  
pp. 3-7
Author(s):  
Ze Long You ◽  
Xiang Ming Zhang ◽  
Kui Du
Keyword(s):  
Finite Element ◽  
Steel Plate ◽  
Three Dimensional ◽  
Adhesive Layer ◽  
Shell Element ◽  
Element Model ◽  
Element Analysis ◽  
Spring Element ◽  
Bonded Repair ◽  
Spring Plate

An ANSYS-based "volume-spring-plate" three-dimensional finite element model is established in this paper to analyze steel plate with a rectangular hole reinforced by double-side bonding patch, in which the plate is simulated by solid45 8-node 3D element, the adhesive layer is simulated by linear elastic spring element combin14, and the patch is simulated by shell element. Relative intensity, relative stiffness and yield load rising rate of a patched steel plate with regard to parameters, such as the patch length, width, the number of patch layer and ply orientation are studied. The results indicate that composite bonded repair can effectively restore the mechanical properties of the structure and improve the service life.

scholarly journals A novel analytical curved beam model for predicting elastic properties of 3D eight-harness satin weave composites

2018 ◽  
Vol 25 (4) ◽  
pp. 689-706 ◽  
Author(s):  
Faqi Liu ◽  
Zhidong Guan ◽  
Tianya Bian ◽  
Wei Sun ◽  
Riming Tan
Keyword(s):  
Finite Element ◽  
Elastic Properties ◽  
Three Dimensional ◽  
Element Model ◽  
Close Correlation ◽  
Sensitivity Study ◽  
Curved Beam ◽  
Beam Model ◽  
Energy Principle ◽  
Representative Unit Cell

AbstractAn offset representative unit cell (ORUC) is introduced to predict elastic properties of three-dimensional (3D) eight-harness satin weave composites both analytically and numerically. A curved beam model is presented based on minimum complementary energy principle, which establishes an analytical solution for elastic modulus and Poisson’s ratio calculation. Finite element method is developed to predict engineering constants of composites. Modified periodic boundary conditions and load method for ORUC are also presented. Experiments of simulated material are performed under tensile test. Close correlation is obtained between experimental data and predictions. Sensitivity study is conducted and manifests that within a large variation of constitutive material properties, the curved beam model derives close predictions comparing to finite element model, which indicates the stability of the curved beam model. Parametric study is also conducted to discuss the effect of weave type and geometric dimensions on elastic properties. It is argued that the curved beam model could manifest fine predictions accurately and stably, and is recommended for the prediction of elastic properties of satin weave composite.

scholarly journals The Partitioned Mixed Model of Finite Element Method and Interface Stress Element Method with Arbitrary Shape of Discrete Block Element

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Zhang Qing ◽  
Zhuo Jiashou ◽  
Xia Xiaozhou
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Arbitrary Shape ◽  
Mixed Model ◽  
Three Dimensional ◽  
Element Model ◽  
Interface Stress ◽  
Interface Element ◽  
Spring Element ◽  
Element Method

Based on the model of rigid-spring element suitable for homogeneous elastic problem, which was developed by Japanese professor Kawai, the interface stress element model (ISEM) for solving the problem of discontinuous media mechanics has been established. Compared with the traditional finite element method (FEM), the ISEM is more accurate and applicable. But the total number of freedom degree of ISEM in dealing with three-dimensional problems is higher than that of FEM, which often brings about the reduction on efficiency of calculation. Therefore, it is necessary to establish a mixed model by gathering the advantages of ISEM and FEM together. By making use of the good compatibility of ISEM and introducing the concept of transitional interface element, this paper combines ISEM and FEM and proposes a mixed model of ISEM-FEM which can solve, to a large extent, the contradictions between accuracy and efficiency of calculation. In addition, using natural coordinate, algorithm of ISEM for block elements of arbitrary shape has been performed. Numerical examples show that the method proposed in this paper is feasible and its accuracy is satisfactory.

Impact of spinal rod stiffness on porcine lumbar biomechanics: Finite element model validation and parametric study

2017 ◽  
Vol 231 (12) ◽  
pp. 1071-1080
Author(s):  
Martin Brummund ◽  
Vladimir Brailovski ◽  
Yvan Petit ◽  
Yann Facchinello ◽  
Jean-Marc Mac-Thiong
Keyword(s):  
Finite Element ◽  
Lumbar Spine ◽  
Finite Element Model ◽  
Three Dimensional ◽  
Variable Stiffness ◽  
Transverse Process ◽  
Threshold Value ◽  
Element Model ◽  
Three Dimensional Finite Element

A three-dimensional finite element model of the porcine lumbar spine (L1–L6) was used to assess the effect of spinal rod stiffness on lumbar biomechanics. The model was validated through a comparison with in vitro measurements performed on six porcine spine specimens. The validation metrics employed included intervertebral rotations and the nucleus pressure in the first instrumented intervertebral disc. The numerical results obtained suggest that rod stiffness values as low as 0.1 GPa are required to reduce the mobility gradient between the adjacent and instrumented segments and the nucleus pressures across the porcine lumbar spine significantly. Stiffness variations above this threshold value have no significant effect on spine biomechanics. For such low-stiffness rods, intervertebral rotations in the instrumented zone must be monitored closely in order to guarantee solid fusion. Looking ahead, the proposed model will serve to examine the transverse process hooks and variable stiffness rods in order to further smooth the transition between the adjacent and instrumented segments, while preserving the stability of the instrumented zone, which is needed for fusion.

Mixed Interface Stress Element-Finite Element Model with its Application

2014 ◽  
Vol 983 ◽  
pp. 412-419
Author(s):  
Yan Hua Sun ◽  
Fei Wu ◽  
Kai Sun ◽  
Dong Dong Li
Keyword(s):  
Finite Element ◽  
Mixed Model ◽  
Three Dimensional ◽  
Element Model ◽  
Elastic Problem ◽  
Interface Stress ◽  
Interface Element ◽  
Negative Effects ◽  
Spring Element ◽  
Counting Methods

Based on the model of rigid-spring element suitable for homogeneous elastic problem, which was developed by Japanese professor Kawai, the interface stress element model (ISEM) for solving the problem of discontinuous media mechanics has been established. Compared with the traditional finite element method (FEM), the ISEM is more accurate and applicable. But on the other hand, the total number of freedom degree of ISEM in dealing with three-dimensional problems is higher than that of FEM, which often brings about the negative effects on efficiency of calculation. Therefore, it is necessary to establish a mixed model by gathering the advantages of ISEM and FEM together. By making use of the good compatibility of ISEM and introducing the concept of transitional interface element, this paper combines the counting methods of ISEM and FEM, and proposes a mixed model of ISEM-FEM, which can solve, to a large extent, the contradictions between accuracy and efficiency of calculation. The examples prove the applicability and adaptability of this model to engineering.

A Finite Element Tire Model and Vibration Analysis: A New Approach

1998 ◽  
Vol 26 (3) ◽  
pp. 149-172 ◽  
Author(s):  
Y. Zhang ◽  
T. Palmer ◽  
A. Farahani
Keyword(s):  
Finite Element ◽  
Three Dimensional ◽  
Element Model ◽  
Dynamic Mechanical Properties ◽  
Fast Fourier Transformation ◽  
Tire Model ◽  
New Approach ◽  
The Time Domain ◽  
Dynamics Analyses ◽  
Free Drop

Abstract A complete finite element tire model was developed for the purposes of vehicle dynamics analyses and full vehicle finite element model real time proving ground simulations. The tire model was validated through simulations of some of the very important global, static and dynamic mechanical properties such as the tire radial and lateral stiffnesses, free-drop test, and low-speed rolling cornering stiffness. The three-dimensional free vibration and harmonic/randomly forced vibrations with ground contact of the tire model were studied here. One of the main purposes for the present study is to provide a new approach toward tire and vehicle NVH studies. All the analyses were nonconventional in the sense that, instead of NASTRAN-type modal analysis, the explicit nonlinear dynamic finite element code LS/DYNA3D was used to conduct all the analyses in the time domain, and the vibration modes were decomposed via fast fourier transformation.

Voxel Models as Input for Heat Transfer Simulations Based on X-ray Microtomography Images of Random Fiber Reinforced Composites

2018 ◽  
Vol 1 (1) ◽  
pp. 114-119
Author(s):  
Steven K. Latré ◽  
Ilya Straumit ◽  
Frederik Desplentere ◽  
Stepan V. Lomov
Keyword(s):  
Finite Element ◽  
Three Dimensional ◽  
Element Model ◽  
Simulation Software ◽  
Fiber Reinforced Composites ◽  
Reinforced Composites ◽  
Fibrous Materials ◽  
Fiber Reinforced ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

This paper proposes a method for the creation of a three-dimensional finite element model representing fiber reinforced insulation materials for the simulation software Siemens NX. VoxTex software, a tool for quantification of µCT images of fibrous materials, is used for the transformation of microtomography images of random fiber reinforced composites into finite element models. The paper describes the numerical tools used for the image quantification and the conversion and illustrates them on several thermal simulations of fiber reinforced insulation blankets filled with low thermal conductive fillers. The experimental measurements validate the prediction of the thermal conductivity.

scholarly journals Modeling Procedures for Estimation of Extensional Stiffness of Knitted Fabric Reinforced Composites

1997 ◽  
Author(s):  
S. Ramakrishna ◽  
S. K. Lim ◽  
S. H. Teoh
Keyword(s):  
Finite Element ◽  
Three Dimensional ◽  
Element Model ◽  
Knitted Fabric ◽  
Reinforced Composites ◽  
Element Analysis ◽  
Shell Elements ◽  
Dimensional Finite Element ◽  
Experimental Values ◽  
Three Dimensional Finite Element

This paper presents effective extensional stiffness of plain-weft knitted fabric reinforced composites obtained from finite element analysis and analytical calculations. For micro-mechanical analyses, a unit cell, enclosing the characteristic periodic repeat pattern in the knitted fabric, is isolated and modeled. Psuedo three-dimensional finite element model is constructed using laminated shell elements. Composite extensional stiffness is estimated for plane-stress and plane-strain conditions. Further, stiffness and compliance averaging methods have been used to determine the upper and lower limits of composite stiffness. The models are explicitly based on the properties of fiber and matrix materials and orientation of yarns. Results obtained from the models are compared with experimental values.

Torsional Analysis of a Steel Cord-Rubber Tire Belt Structure

1996 ◽  
Vol 24 (4) ◽  
pp. 339-348 ◽  
Author(s):  
R. M. V. Pidaparti
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Composite Structures ◽  
Three Dimensional ◽  
Element Model ◽  
Torsional Stiffness ◽  
Element Analysis ◽  
Rubber Belt ◽  
Steel Cord ◽  
Torsional Analysis

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.

Finite Element Analysis of Nonuniformity of Tires with Imperfections5

2007 ◽  
Vol 35 (3) ◽  
pp. 226-238 ◽  
Author(s):  
K. M. Jeong ◽  
K. W. Kim ◽  
H. G. Beom ◽  
J. U. Park
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Element Model ◽  
Radial Force ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Dimensional Finite Element ◽  
Force Variation ◽  
Three Dimensional Finite Element

Abstract The effects of variations in stiffness and geometry on the nonuniformity of tires are investigated by using the finite element analysis. In order to evaluate tire uniformity, a three-dimensional finite element model of the tire with imperfections is developed. This paper considers how imperfections, such as variations in stiffness or geometry and run-out, contribute to detrimental effects on tire nonuniformity. It is found that the radial force variation of a tire with imperfections depends strongly on the geometrical variations of the tire.

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