scholarly journals CONTACT PROBLEM OF INTERACTION OF A GUIDE ROLLER WITH A MINE CONDUCTOR

2021 ◽  
Vol 3 (56) ◽  
pp. 83-89
Author(s):  
Michael A. ZHURAVKOV ◽  
◽  
Mikhail A. NIKOLAITCHIK ◽  
Pavel S. MAEVSKI ◽  
◽  
...  
Keyword(s):  
Finite Element ◽  
Comparative Analysis ◽  
Contact Problem ◽  
Model Problem ◽  
Element Model ◽  
Force Interaction ◽  
Elastoplastic Behavior ◽  
Plastic Deformations ◽  
Guide Roller ◽  
High Degree

The article considers the force interaction contact problem of a guide roller with a mine conductor during the movement of a mine lifting conveyance on the example of a model problem of the contact interaction of a torus with a beam. The model problem analytical solution is considered, a finite element model of the system under study is developed. Contacting bodies materials elastoplastic behavior was taken into account when solving the problem. The various contact types between guiding roller and the conductors were considered. The values of critical loads leading to plastic deformations occurrence in a conductor with various types of contacts are determined and their relationship with the friction coefficient value is established. Comparative analysis of the obtained analytical and numerical results demonstrates a high degree of correlation.

The Design and Size Optimization of the New FCEV Subframe Based on Hypermesh Platform

2011 ◽  
Vol 328-330 ◽  
pp. 435-440
Author(s):  
Jun Liao ◽  
Lan Shan ◽  
Yan Feng
Keyword(s):  
Finite Element ◽  
Comparative Analysis ◽  
Finite Element Model ◽  
Mode Shape ◽  
High Strength Steel ◽  
High Strength ◽  
Element Model ◽  
Strength Analysis ◽  
Size Optimization ◽  
Optimal Size

The establishment of FCEV finite element model of the subframe is based on Hypermesh platform, and a new subframe structure is designed in accordance with the stiffness and strength analysis on the original subframe in all conditions. High-strength steel materials are used to optimize the design of this new structure, which result in the optimal size. Through the comparative analysis of the strength, stiffness, mode shape and quality on new subframe and the original one, it is verified that the design of the new subframe is reasonable and feasible.

Investigation of a Double-Arched Bridges Mechanical Behavior by the Static Load Test

2014 ◽  
Vol 501-504 ◽  
pp. 1297-1300
Author(s):  
Hai Yun Huang ◽  
Jun Ping Zhang
Keyword(s):  
Finite Element ◽  
Comparative Analysis ◽  
Working Conditions ◽  
Static Load ◽  
Element Model ◽  
Load Test ◽  
Structural Deformation ◽  
Static Load Test ◽  
Load Bearing Capacity ◽  
Calculation Results

An on-site static load test of a reinforced concrete double-arch bridge with fracture is carried out, and a comparative analysis of the measured experimental results of the bridge working conditions and the calculation results of Midas/civil Finite Element Model is performed. The results show that the performance and structural deformation recoverability of the bridge is weak. The bridges overall load-bearing capacity does not satisfy its designed requirements.

scholarly journals Study On The Steel-Aluminum Plastic Clinching of The Inclined Wall Die

2021 ◽  
Author(s):  
Menghan Wang ◽  
Yifeng Chen ◽  
Yan Han ◽  
Lei Li ◽  
Menglong Du
Keyword(s):  
Finite Element ◽  
Failure Mode ◽  
Flow Characteristics ◽  
Element Model ◽  
Wall Structure ◽  
Steel Sheets ◽  
Neck Thickness ◽  
Joint Quality ◽  
Separation Failure ◽  
High Degree

Abstract Aiming at the problems of low strength and unsatisfactory connection quality of plastic clinching of heterogeneous lightweight materials for the cars body, the Q235 steel sheets, and 5052 aluminum alloy sheets were taken as the research objects, and the inclined wall die for plastic clinching was designed based on the deformation and flow characteristics of sheets in the plastic clinching process. The elastic-plastic finite element numerical simulation and experimental research were used to analyze the plastic clinching process of the inclined wall die, and the failure mode and mechanism of the clinching joints in the shear and peel experiment were deeply studied. The results show that the inclined wall die can effectively increase the interlock value of the joints and reduce the maximum joining force during the clinching process under the condition of ensuring the neck thickness of the joints. When the inclined wall angle α increases from 90° to 100°, the interlock value increases by 38.9%, and the maximum joining force decreases by 8.3%. The influence of inclined wall structure on joint quality can be divided into extrusion stage, radial inflow stage, and stability stage. The comparison between the clinching experiment and the finite element results shows that the two results are in good agreement, which proves that the finite element model of plastic clinching of inclined wall die has a high degree of credibility, and verifies the feasibility of practical application of inclined wall die. Finally, under shear and peel loads, the main failure mode of the joints is separation failure.

Investigation of Broken Cut Spikes on Elastic Fastener Tie Plates Using an Integrated Simulation Method

2018 ◽  
Author(s):  
Yin Gao ◽  
Mike McHenry ◽  
Brad Kerchof
Keyword(s):  
Finite Element ◽  
Element Model ◽  
Simulation Method ◽  
Operating Conditions ◽  
Analysis Model ◽  
Element Analysis ◽  
Integrated Simulation ◽  
Multibody Model ◽  
Track System ◽  
High Degree

Cut spike fasteners, used with conventional AREMA rolled tie plates and solid sawn timber ties, are the most common tie and fastener system used on North American freight railroads. Cut spikes are also used to restrain tie plates that incorporate an elastic rail fastener — that is, an elastic clip that fastens the rail to the tie plate. Elastic fasteners have been shown to reduce gage widening and decrease the potential for rail roll compared to cut spike-only systems. For this reason, elastic fastener systems have been installed in high degree curves on many railroads. Recent observations on one Class I railroad have noted broken cut spikes when used with these types of tie plates in mountainous, high degree curve territory. Broken screw spikes and drive spikes on similar style plates have also been observed. In this paper, a simulation method that integrates a vehicle-track system dynamics model, NUCARS®, with a finite element analysis model is used to investigate the root causes of the broken spikes. The NUCARS model consists of a detailed multibody train, wheel-rail contact parameters, and track model that can estimate the dynamic loading environment of the fastening system. For operating conditions in tangent and curve track, this loading environment is then replicated in a finite element model of the track structure — ties, tie plates, and cut spikes. The stress contours of the cut spikes generated in these simulations are compared to how cut spikes have failed in revenue service. The tuning and characterization of both the vehicle dynamics multibody model and the finite element models are presented. Additionally, the application of this approach to other types of fastening systems and spike types is discussed. Preliminary results have identified a mechanism involving the dynamic unloading of the tie plate-to-tie interface due to rail uplift ahead of the wheel and the resulting transfer of net longitudinal and lateral forces into the cut spikes. Continued analysis will attempt to confirm this mechanism and will focus on the severity of these stresses, the effect of increased grade, longitudinal train dynamics, braking forces, and curvature.

scholarly journals STUDY OF A DURABILITY OF THE MEMBRANE LAYER OF A LONG-SPAN SUPERSTRUCTURE

2019 ◽  
Vol 7 (2) ◽  
pp. 10-14
Author(s):  
Галина Кравченко ◽  
Galina Kravchenko ◽  
Елена Труфанова ◽  
Elena Trufanova ◽  
Юлия Боженкова ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Plastic Deformations ◽  
Membrane Layer ◽  
Large Span ◽  
Long Span ◽  
Snow Pressure ◽  
Membrane Coating ◽  
The Finite Element Model

The study of the membrane coating of large-span structures is carried out. Five stages of installation and operation of the coating are considered. The uneven snow pressure on the coating was calculated and applied to the finite element model of the structure. Based on the results, the authors also provide conclusions and summary about the considered structure. Two options of emergency cases have been investigated. The results showed that the support contour is a key element of the structure. The failure of any element, connection except of the support contour does not lead to plastic deformations in the coating.

A 3D Biphasic Finite Element Model of the Human Knee Joint for the Study of Tibiofemoral Contact and Fluid Pressurization

2013 ◽  
Author(s):  
Hongqiang Guo ◽  
Suzanne A. Maher ◽  
Robert L. Spilker
Keyword(s):  
Finite Element ◽  
Fluid Flow ◽  
Knee Joint ◽  
Contact Problem ◽  
Finite Element Model ◽  
Soft Tissues ◽  
Fluid Pressure ◽  
Element Model ◽  
Human Knee Joint ◽  
Biphasic Finite Element

Biphasic theory which considers soft tissue, such as articular cartilage and meniscus, as a combination of a solid and a fluid phase has been widely used to model their biomechanical behavior [1]. Though fluid flow plays an important role in the load-carrying ability of soft tissues, most finite element models of the knee joint consider cartilage and the meniscus as solid. This simplification is due to the fact that biphasic contact is complicated to model. Beside the continuity conditions for displacement and traction that a single-phase contact problem consists of, there are two additional continuity conditions in the biphasic contact problem for relative fluid flow and fluid pressure [2]. The problem becomes even more complex when a joint is being modeled. The knee joint, for example, has multiple contact pairs which make the biphasic finite element model of this joint far more complex. Several biphasic models of the knee have been developed [3–9], yet simplifications were included in these models: (1) the 3D geometry of the knee was represented by a 2D axisymmetric geometry [3, 5, 6, 9]; (2) no fluid flow was allowed between contact surfaces of the soft tissues [4, 8] which is inconsistent with the equation of mass conservation across the contact interface [10]; (3) zero fluid pressure boundary conditions were inaccurately applied around the contact area [7].

Assessment of the Realistic Stiffness and Capacity of the Connections in Quincha Frames to Develop Numerical Models

2013 ◽  
Vol 778 ◽  
pp. 526-533 ◽  
Author(s):  
Natalie Quinn ◽  
Dina D’Ayala
Keyword(s):  
Finite Element ◽  
Numerical Models ◽  
Experimental Tests ◽  
Element Model ◽  
Accurate Representation ◽  
Timber Frame ◽  
Historic Structures ◽  
The World ◽  
Infill Material ◽  
High Degree

Peru is one of the most seismically active countries in the world, this fact highlighted by several destructive earthquakes in recent years. The centre of Lima has a large number of historic structures with a ground floor in adobe, and their upper storeys in quincha, a traditional technique consisting of a timber frame with an infill of canes and mud. Despite the existence of a large number of buildings containing this technique, very little is known about its seismic performance. In order to investigate this, a series of experimental tests on quincha frames, with and without the infill, have been carried out previously, with the aim of quantifying the lateral behaviour and identifying vulnerable areas. The present paper details work carried out to develop a finite element model of the test frames without infill. This model of the timber frame will enable an accurate representation of the frame behaviour to be developed before adding the infill of canes and mud to the model. As the behaviour of the infill material and its connection to the frame is difficult to determine, characterising the timber frame with a high degree of accuracy ensures that the contribution of the infill can be globally quantified from the overall experimental results. The beams and posts are connected by cylindrical mortice and tenon joints, with a diagonal bracing member providing some lateral restraint. The connections have been modelled semi-rigid springs, with the stiffness calculated using variations of the component method. This was found to give very similar results to those obtained experimentally.

Design and Optimization of FCEV Subframe by Integrated Applications of Hypermesh, UG and ADAMS Multi-Platform

2011 ◽  
Vol 328-330 ◽  
pp. 213-219
Author(s):  
Jun Liao
Keyword(s):  
Finite Element ◽  
Aluminum Alloy ◽  
Comparative Analysis ◽  
Element Model ◽  
Strength Analysis ◽  
Optimal Size ◽  
Virtual Model ◽  
Design And Optimization ◽  
New Type

The UG model and finite element model of FCEV subframe are established, and original subframe is simulated in all kinds of ADAMS environment, which result in the force of the conditions obtained. Then the virtual model is build, stiffness and strength analysis are conducted, and a new type of subframe structure is designed based on the analysis results. Magnesium alloy and aluminum alloy are used in optimization of this new structure for the optimal size. Through the comparative analysis on strength, stiffness, mode shape and quality of the new subframe and the original one, it was verified that the new subframe design is reasonable and feasible.

The Local Stress Analysis for the Anchorage Zone of Tooth Plate in Steel Box Girder

2013 ◽  
Vol 477-478 ◽  
pp. 631-634
Author(s):  
Zuo Long Luo ◽  
Jiang Long Wang ◽  
Feng Hui Dong
Keyword(s):  
Finite Element ◽  
Comparative Analysis ◽  
Local Stress ◽  
Element Model ◽  
Maximum Difference ◽  
Box Girder ◽  
Steel Box Girder ◽  
Tooth Plate ◽  
The Difference ◽  
Different Parts

Calculating the local stress for the anchorage zone of each part in the tooth plate by establishing two kinds of finite element model: considering concrete effect and not considering concrete effect. The result of the comparative analysis of the two models shows that the local stress considering the concrete effect is smaller than that not considering the concrete effect and the maximum difference is about 170 MPa. The difference is not the same in different parts of the tooth plate. Although the design will be tend to be safe for not considering the concrete effect, the size of the tooth plate may increase. Therefore, in order to reduce the weight of the tooth plate , the concrete effect should be taken into consideration in the design.

The Grouting Bored Pile Perfusing Pile Bearing Capacity after Effect Factors of the Finite Element Analysis

2012 ◽  
Vol 461 ◽  
pp. 351-354
Author(s):  
Shao He Li ◽  
Qun Xian Lin
Keyword(s):  
Finite Element ◽  
Comparative Analysis ◽  
Bearing Capacity ◽  
Influence Factors ◽  
Element Model ◽  
Model Parameters ◽  
Single Pile ◽  
Element Analysis ◽  
Bored Pile ◽  
After Effect

This article take the Zhejiang some project engineering geology condition as a background, Through comparative analysis with single pile load, determine the model parameters of ANSYS finite element, The ANSYS finite element model of single pile, Respectively on the Grouting pile and Grouting for grouting of pile modulus change and Grouting in body size and changes of modulus of pile-end soils and a series of comparative analysis of the situation and analysis on bearing capacity of bored pile tip Grouting influence factors and of the main causes, draw some useful conclusions.

Sign in / Sign up

Export Citation Format

Share Document