scholarly journals Structural Analysis of a Freight Wagon with Composite Walls

2019 ◽  
Vol 57 (2) ◽  
pp. 140-151
Author(s):  
Alexandru Ionut Patrascu ◽  
Anton Hadar ◽  
Stefan Dan Pastrama
Keyword(s):  
Finite Element ◽  
Total Mass ◽  
Mechanical Response ◽  
Numerical Study ◽  
Composite Plates ◽  
The Body ◽  
Finite Element Analyses ◽  
Vehicle Structure ◽  
Composite Walls ◽  
Different Thickness

The paper presents a numerical study regarding the mechanical response of the body of a freight wagon to the usual loads encountered during service. The main goal of the present research is to investigate the possibility to replace the steel walls of the wagon with walls made of laminated composites. In this way, the total mass of the wagon can be decreased, leaving room for supplementary load of goods. Finite element analyses of the wagon with steel walls is presented first, in order to show that most of the load is taken by the structure of the wagon, while the stresses in the walls are low. Further, composite plates with different thickness are studied to find the minimum value of thickness for which the displacements have values below a certain range. These thicknesses are further considered in the finite element analyses of the entire wagon with composite walls to investigate if the new walls significantly change the stresses in the vehicle structure. It was concluded that the replacement does not alter the stress state in the structure, and, consequently, it is a good solution for diminution of the total mass of the vehicle.

Experimental and numerical study on the crashworthiness evaluation of an intercity coach under frontal impact conditions

2020 ◽  
Vol 234 (13) ◽  
pp. 3026-3041 ◽  
Author(s):  
Mehmet Ali Güler ◽  
Muhammed Emin Cerit ◽  
Sinem Kocaoglan Mert ◽  
Erdem Acar
Keyword(s):  
Finite Element ◽  
Energy Absorption ◽  
Numerical Study ◽  
Absorption Capacity ◽  
The Body ◽  
Steering Wheel ◽  
Energy Absorption Capacity ◽  
Bus Structure ◽  
Bus Body ◽  
Absorption Characteristics

In this study, the energy absorption capacity of a front body of a bus during a frontal crash was investigated. The strength of the bus structure was examined by considering the ECE-R29 European regulation requirements. The nonlinear explicit finite element code LS-DYNA was used for the crash analyses. First, the baseline bus structures without any improvements were analyzed and the weak parts of the front end structure of the bus body were examined. Experimental tests are conducted to validate the finite element model. In the second stage, the bus structure was redesigned in order to strengthen the frontal body. Finally, the redesigned bus structure was compared with the baseline model to meet the requirements for ECE-R29. In addition to the redesign performed on the body, energy absorption capacity was increased by additional energy absorbers employed in the front of bus structure. This study experimentally and numerically investigated the energy absorption characteristics of a steering wheel armature in contact with a deformable mannequin during a crash. Variations in the location of impact on the armature, armature orientation, and mannequin were investigated to determine the effects of the energy absorption characteristics of the two contacting entities.

A Comparative Numerical Study on the Bending Response of Aluminium Stiffened Plates With Fixed/Floating Frames

2008 ◽  
Author(s):  
Mohammad Reza Khedmati ◽  
Mehran Rastani
Keyword(s):  
Finite Element ◽  
Maximum Stress ◽  
Numerical Study ◽  
Point Of View ◽  
Stiffened Plates ◽  
Stiffened Plate ◽  
Finite Element Analyses ◽  
Bending Response ◽  
Structural Arrangements

In this paper, different structural arrangements of the transverse frames in an orthogonally stiffened plate are investigated from the bending response point of view. The transverse frames are assumed to be either fixed or floating. Other alternate placements of the transverse frames are also included in the comparative calculations. Stress and deflection contours are obtained via finite element analyses. Finally, some recommendations are outlined comparing the results of maximum stress and deflection with the allowable limits.

Quantification of Crack Length and Thickness Effects on J-R Curves by Ductile Damage Models

2006 ◽  
Vol 326-328 ◽  
pp. 935-938
Author(s):  
Yoon Suk Chang ◽  
T.R. Lee ◽  
Jae Boong Choi ◽  
Chang Sung Seok ◽  
Young Jin Kim
Keyword(s):  
Fracture Toughness ◽  
Finite Element ◽  
Crack Length ◽  
Compact Tension ◽  
Width Ratio ◽  
Fracture Toughness Test ◽  
Finite Element Analyses ◽  
Local Approach ◽  
Damage Models ◽  
Different Thickness

In this paper, the applicability of local approach is examined for SA515 Gr.60 nuclear steel through a series of finite element analyses incorporating modified GTN and Rousselier models as well as fracture toughness tests. To achieve the goal, fracture toughness test data of standard compact tension (CT) specimens are used for calibration of micro-mechanical parameters. Then, from finite element analyses employing the calibrated parameters, fracture resistance (J-R) curves of CT specimens with different crack length to width ratio, with different thickness and with/without 20% side-grooves are predicted. Finally, suitability of the numerically estimated J-R curves was verified by comparison with the corresponding experimental J-R curves.

scholarly journals Modelling of the electric locomotion DS3 working

2019 ◽  
Vol 294 ◽  
pp. 05006
Author(s):  
Dmytro Bannikov ◽  
Anatoliy Radkevich ◽  
Antonina Muntian
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Spatial Distribution ◽  
Numerical Model ◽  
Total Mass ◽  
The Body ◽  
Single System ◽  
The Finite Element Method ◽  
Electric Locomotive ◽  
Element Method

The purpose of the work is to evaluate the spatial distribution of the rigidity of the carrier frame and the body of the Ukrainian electric locomotive DC3 as a single system during operation and repair. The research was carried out on the basis of the finite element method with the application of design and computing complex SCAD for Windows. The numerical model of the electric locomotive was built, tested and then used to identify the causes and providing guidance on solving some specific operational questions. They are included, for example, the possibility of eliminating the body skew when jacking up on jacks and jamming the door as a result. The researches showed that the structure of the electric locomotive DS3 in general has a rather high spatial rigidity, both in transverse and longitudinal directions, and on torsion. However, for some practical repair tasks there is not enough for that rigidity. It was recommended to increase the thickness of the shell of its body up to 4 mm or the roof up to 8 mm, which leads to an increasing in the total mass of the machine by about 2,5 and 3,5 tons, respectively.

scholarly journals Analysis of cold-formed steel rectangular hollow flange beams

2021 ◽  
Vol 16 (1) ◽  
pp. 58-64
Author(s):  
Nathalie Eid ◽  
Attila László Joó
Keyword(s):  
Finite Element ◽  
Numerical Study ◽  
Experimental Tests ◽  
Finite Element Analyses ◽  
Ansys Software ◽  
Current Standard ◽  
Bending Capacity ◽  
Cold Formed Steel ◽  
Thin Walled ◽  
Flange Beams

AbstractThis paper presents the results of a theoretical-numerical study of laterally-restrained thin-walled steel rectangular hollow flange beams subjected to bending, shear and bending and shear interaction. Finite element analyses were carried out by using ANSYS software, and validated by previous experimental tests. Furthermore, the effect of intermediate stiffeners was investigated, where the improvement percentage in bending capacity was 4.4%. Additionally, all the corresponding outcomes were calculated according to EN 1993-1-3. The results showed that current standard rules tend to be somewhat conservative in both bending and bending and shear interaction cases, while they are not quite accurate in shear case.

Static analysis of laminated and sandwich composite plates based on simple refined higher-order displacement theory

2010 ◽  
Vol 32 (2) ◽  
pp. 95-106
Author(s):  
Tran Minh Tu
Keyword(s):  
Finite Element ◽  
Static Analysis ◽  
Composite Plates ◽  
Higher Order ◽  
Sandwich Composite ◽  
Sandwich Plates ◽  
Present Formulation ◽  
Numerical Examples ◽  
Displacement Theory ◽  
Different Thickness

A simple refined higher-order displacement theory is used for the static analysis of laminated and sandwich plates. Both analytical and finite element solutions are developed. Numerical examples of laminated and sandwich plates are given for different thickness ratios, length-to-thickness ratios to illustrate the accuracy of the present formulation by comparing the present results with results already available in the literature.

The Strain Energy Tuning of the Shape Memory Alloy on the Post-Buckling of Composite Plates Using Finite Element Method

2012 ◽  
Vol 445 ◽  
pp. 577-582 ◽  
Author(s):  
Zainudin A. Rasid ◽  
Saiful Amri Mazlan ◽  
Ayob Amran ◽  
Rizal Zahari ◽  
Dayang Laila Majid ◽  
...  
Keyword(s):  
Finite Element ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Critical Loads ◽  
Strain Energy ◽  
Numerical Study ◽  
Composite Plates ◽  
Active Strain ◽  
Post Buckling ◽  
Energy Tuning

This paper presents a geometric non-linear finite element model of shape memory alloy composite plates and its source code in order to determine critical loads and to trace post-buckling paths of the composite plates. A numerical study was conducted on symmetric and anti-symmetric angle-ply and cross-ply composite plates. Buckling and post-buckling improvements of composite plates due to the shape memory effect behaviour of shape memory alloy were carried out. The pre-strained shape memory alloy wires were embedded within laminated composite plates so that recovery stress could be induced with the heated wires. The methods of active property tuning and active strain energy tuning were applied to show the various effects of the shape memory alloy on the studied behaviour. The result showed that significant improvements occurred in the critical loads and the post-buckling paths of the symmetric and anti-symmetric angle-ply and the symmetric cross-ply composite plates due to the active strain energy tuning method. In the case of the anti-symmetric cross-ply composite plate where bifurcation point did not exist, the post-buckling path was substantially improved.

Numerical Study of Dynamic Response of Steel Deck Pavement on the Bascule Bridge

2010 ◽  
Vol 148-149 ◽  
pp. 1246-1249
Author(s):  
Yun Liu ◽  
Xin Yu ◽  
Zhen Dong Qian
Keyword(s):  
Finite Element ◽  
Mechanical Response ◽  
Steel Plate ◽  
Numerical Study ◽  
Element Model ◽  
Shear Stresses ◽  
Asphalt Paving ◽  
Steel Deck ◽  
The Finite Element Model ◽  
Opening Process

The bascule bridge is one of the most suitable bridge types for ports and rivers in cities. In order to discuss the mechanical behavior of the pavements in the opening process, the finite element model of the pavement system on the Haihe Bridge being built in Tianjin China was built, and the mechanical response in the opening process was calculated. The research results show that the asphalt paving with the thickness of 30mm~40mm is fit for the bascule bridge. The max shear stresses of pavement between pavement and steel plate in the opening process rise with the increase of Young’s modulus, and the high temperature during the construction and conservation after construction should be provided.

scholarly journals Simplified methods for designing thermo-active retaining walls

2020 ◽  
Vol 205 ◽  
pp. 06011 ◽  
Author(s):  
Eleonora Sailer ◽  
David M. G. Taborda ◽  
Lidija Zdravkovic ◽  
David M. Potts
Keyword(s):  
Finite Element ◽  
Heat Exchanger ◽  
Mechanical Response ◽  
Mechanical Design ◽  
Retaining Wall ◽  
Three Dimensional ◽  
Finite Element Analyses ◽  
Factors Affecting ◽  
Heating And Cooling

Thermo-active retaining structures are geotechnical structures employed to provide thermal energy to buildings for space heating and cooling through heat exchanger pipes embedded within the concrete structure. Consequently, the design of these structures needs to consider both the long-term energy efficiency as well as the thermo-mechanical response in terms of stability and serviceability. Transient finite element analyses can be carried out to evaluate the behaviour of thermo-active walls, where the heat exchanger pipes are explicitly modelled, thus requiring three-dimensional (3D) analyses. However, performing long-term 3D finite element analyses is computationally expensive. For this reason, in this study, new approaches are presented that allow the thermal or thermo-mechanical design of thermo-active walls to be carried out by performing two-dimensional (2D) plane strain analyses. Two methods, which are based on different design criteria, are proposed and their performance in replicating the three-dimensional behaviour is assessed. Furthermore, the factors affecting the 2D approximations for the two modelling approaches are evaluated, where particular emphasis is given to the influence of the simulated boundary condition along the exposed face of the retaining wall.

scholarly journals Finite-Element-Based Design Optimisation of a Novel High Flexion Knee Used in Total Knee Arthroplasty

2008 ◽  
Vol 5 (2) ◽  
pp. 77-87 ◽  
Author(s):  
Sudesh Sivarasu ◽  
Lazar Mathew
Keyword(s):  
Finite Element ◽  
Total Knee Arthroplasty ◽  
Knee Arthroplasty ◽  
Slight Modification ◽  
The Body ◽  
Finite Element Analyses ◽  
Linear Deformation ◽  
Extreme Stress ◽  
Flexion Extension ◽  
Total Knee

The application of finite-element modelling in medical applications has been evolving as a field of high importance in recent times. Total knee arthroplasty (TKA) has been in existence for over 6 decades. The generic artificial knee implants used in the TKA have a restricted range of motion of around 90 degrees. A new design allowing a flexion extension range of over 120 degrees was designed and is used for analysis. Loading conditions of 10 times the body weight are considered. The finite-element analyses of the designs were carried out based on standard biomaterials used in orthopaedic implants. The results of the analyses were used in identifying areas of extreme stress within the design and the spots prone to higher deformation. On the basis of these results slight modification of the designs was carried out. The results are also verified whether the body is within the linear deformation levels. The results obtained were very satisfactory and based on these results the models have been recommended for prototyping.

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