scholarly journals Finite element model of bamboo culm (Phyllostachys sp.) and its comparison to two experimental tests

2010 ◽  
Vol 58 (1) ◽  
pp. 153-160
Author(s):  
Václav Sebera ◽  
Jan Tippner ◽  
Petr Horáček ◽  
Aleš Dejmal ◽  
Martin Beníček
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Three Dimensional ◽  
Experimental Tests ◽  
Material Model ◽  
Element Model ◽  
Parametric Models ◽  
Bending Test ◽  
Bamboo Culm ◽  
Culm Wall

The main goal of the work was to build up a general parametric finite-element model of a bamboo culm in ANSYS computational system. Subsequently the model was compared to a experimental measurements of chosen mechanical properties – three point bending test and brasil test. A pa­ra­me­ter being compared was a force, which is necessary to exert to deform a sample on given strain. In this work two parametric models were created. First one is including dividing barrier – diaphragm. A mesh of the culm wall is mapped and is divided into three layers with different orthotropic material models in cylindrical coordinate system with respect to the culm axis. By contrast the barrier – diaphragm – is represented by free mesh with isotropic material model. Both FE models are fully parametric and three-dimensional. Hence they are very well utilizable for both further research of the bamboo itself and constructions from it.

Utilization of Splice Skew Joint with Key on Reconstruction of Historical Trusses

2013 ◽  
Vol 688 ◽  
pp. 207-212 ◽  
Author(s):  
Karel Šobra ◽  
Petr Fajman
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Mechanical Behaviour ◽  
Three Dimensional ◽  
Joint Stiffness ◽  
Experimental Tests ◽  
Element Model ◽  
Numerical Results ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

Currently, for reconstruction of historical trusses traditional carpentry joints are used. For many years these joints are constructed in the same way. Unfortunately, the mechanical behaviour of these joints and influence of their parts and geometry of joints to the joint stiffness are not well known. To improve these joints, it is necessary to know their behaviour. This paper describes a study recently completed on the vertical splice skew joint with a key. Experimental tests were performed and compared to the numerical results of three-dimensional finite element model created using ATENA 3D.

Comparison Between Stress Obtained by Numerical Analysis and In-Situ Measurements on a Flexible Pipe Subjected to In-Plane Bending Test

2016 ◽  
Author(s):  
Troels Vestergaard Lukassen ◽  
Kristian Glejbøl ◽  
Anders Lyckegaard ◽  
Christian Berggreen
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Performance Optimization ◽  
Three Dimensional ◽  
Element Model ◽  
Bending Test ◽  
Flexible Pipe ◽  
Stress Variation ◽  
Stress Variations

To predict the lifetime and long-term properties of tensile armour wires in a dynamically loaded pipe, it is essential to have a tool which allows detailed prediction of the stress variations in the tensile armour wires during global pipe loading. Furthermore, detailed understanding of the stress variations will allow for performance optimization of the armour layers. To study the detailed stress variations in flexible pipes during dynamic loading, a comprehensive three-dimensional implicit nonlinear finite element model has been developed. The predicted numerical stress variations will be compared to stress patterns obtained during in-situ OMS measurements carried out during an actual experimental inplane bending test. The study showed a good correlation between the stress variation predicted with the finite element model and the measured stress variation.

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.

Reduction of Free-Edge Stress Concentration

1985 ◽  
Vol 52 (4) ◽  
pp. 801-805 ◽  
Author(s):  
P. R. Heyliger ◽  
J. N. Reddy
Keyword(s):  
Finite Element ◽  
Stress Concentration ◽  
Finite Element Model ◽  
Three Dimensional ◽  
Element Model ◽  
Free Edge ◽  
Shear Stresses ◽  
Normal Stresses ◽  
Interlaminar Shear ◽  
Three Dimensional Elasticity

A quasi-three dimensional elasticity formulation and associated finite element model for the stress analysis of symmetric laminates with free-edge cap reinforcement are described. Numerical results are presented to show the effect of the reinforcement on the reduction of free-edge stresses. It is observed that the interlaminar normal stresses are reduced considerably more than the interlaminar shear stresses due to the free-edge reinforcement.

scholarly journals Numerical investigation of plastic flow and residual stresses generated in hydroformed tubes

2021 ◽  
pp. 146442072198974
Author(s):  
A Ktari ◽  
A Abdelkefi ◽  
N Guermazi ◽  
P Malecot ◽  
N Boudeau
Keyword(s):  
Finite Element ◽  
Residual Stresses ◽  
Finite Element Model ◽  
Plastic Flow ◽  
Tube Hydroforming ◽  
Three Dimensional ◽  
Element Model ◽  
Tube Cross Section ◽  
Straight Wall ◽  
Hydroforming Process

During tube hydroforming process, the friction conditions between the tube and the die have a great importance on the material plastic flow and the distribution of residual stresses of the final component. Indeed, a three-dimensional finite element model of a tube hydroforming process in the case of square section die has been performed, using dynamic and static approaches, to study the effect of the friction conditions on both plastic flow and residual stresses induced by the process. First, a comparative study between numerical and experimental results has been carried out to validate the finite element model. After that, various coefficients of friction were considered to study their effect on the thinning phenomenon and the residual stresses distribution. Different points have been retained from this study. The thinning is located in the transition zone cited between the straight wall and the corner zones of hydroformed tube due to the die–tube contact conditions changes during the process. In addition, it is clear that both die–tube friction conditions and the tube bending effects, which occurs respectively in the tube straight wall and corner zones, are the principal causes of the obtained residual stresses distribution along the tube cross-section.

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