scholarly journals On the Relation between Strength and Stiffness of Cable Tray

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Yongqi Ma ◽  
Weidong Ding ◽  
Chao Ding ◽  
Hang Ma
Keyword(s):  
Static Load ◽  
Green Manufacturing ◽  
Stiffness Ratio ◽  
The Finite Element Method ◽  
Loading Test ◽  
Weakest Link ◽  
Deflection Test ◽  
Strength And Stiffness ◽  
Material Utilization ◽  
Material Saving

In order to realize the optimal design of the cable supporting system for the purpose of material saving and energy saving and green manufacturing, the strength-stiffness ratio is proposed in the paper in nondimensional form, which defines quantitatively the relation between the static load strength and stiffness of the cable tray. On the premise of ensuring service safety, the correlation between the strength and stiffness of the cable tray under static load is discussed extensively through the theoretical analysis of the mechanical model. The weakest link in the carrying capacity of the cable tray as well as the issue that needs to pay attention is proposed in the process of design and the test of the cable tray. A reasonable strength-stiffness ratio will help to make full use of the potential of material strengths. The value of the strength-stiffness ratio is obtainable by means of the finite element method or by the loading test of the cable tray. It is shown through the analysis that the value of the strength-stiffness ratio being setting in the range close to but less than 1 will make comparatively reasonable material utilization and will help the deflection test going smoothly to obtain a relatively safer allowable working load for the cable tray.

A Flexible Connector Design for Multi-Modular Floating Structures

2018 ◽  
Author(s):  
Huai Zhao ◽  
Daolin Xu ◽  
Haicheng Zhang ◽  
Qijia Shi
Keyword(s):  
Finite Element Method ◽  
Structural Model ◽  
Random Waves ◽  
The Finite Element Method ◽  
Floating Platform ◽  
Stiffness Analysis ◽  
Floating Structures ◽  
Extreme Loads ◽  
Strength And Stiffness ◽  
Frequency Domain Approach

The paper aims to provide a novel flexible connector model for the connection of a multi-modular floating platform. The structural model of the connector is presented. To evaluate connector loads, the governing equation for a modularized floating platform is established using the Rigid Module Flexible Connector (RMFC) model. The dynamic analysis for a two-module floating platform is carried out by using the frequency domain approach in random waves and the extreme loads of the flexible connector are estimated. The finite element method is applied for strength and stiffness analysis to assess the performance of the connector.

Accuracy of Conventional Finite Element Models in Bulk-Forming of Micropins From Sheet Metal

2019 ◽  
Vol 7 (1) ◽  
Author(s):  
M. Kraus ◽  
T. Hufnagel ◽  
M. Merklein
Keyword(s):  
Finite Element ◽  
Sheet Metal ◽  
Process Analysis ◽  
Basic Process ◽  
The Finite Element Method ◽  
High Agreement ◽  
Bulk Forming ◽  
High Production Rate ◽  
High Production ◽  
Material Utilization

The ongoing miniaturization trend in combination with increasing production and functional volume leads to a rising demand for metallic microparts. Bulk forming of microparts from sheet metal provides the potential for mass production of those components by an extensive simplification of the handling. The advantage of a high production rate contrasts with the disadvantage of a low utilization of material. In this context, it is necessary to investigate suitable measures to increase the material utilization. To save cost intensive trial and error tests, numerical analysis could be an appropriate method for a basic process investigation. In this work, a validation with experimental results in the macro- and microscale was used to investigate the eligibility of the finite element method (FEM) for a basic process analysis. For a high transferability, the finite element (FE) models were validated for various tribological conditions and material states. The results reveal that there is a high agreement of the experimental and numerical results in the macroscale. In microscale, conventional FEM shows inaccuracies due to the negligence of size effects in the discretization of the process. This fact limits the application of conventional FE-programs. Furthermore, the results show that lubricated and dry formed blanks lead to the same friction force and process result in the microscale. In addition, the basic formability of the prestrengthened pins in further forming stages was experimentally demonstrated.

The Mechanical Behavior Analyses and Optimization on Large Wind Turbine Frustum Tower Structure

2013 ◽  
Vol 351-352 ◽  
pp. 270-274
Author(s):  
Chun Yan Gao ◽  
Zhao Yu Gong ◽  
Bin Li
Keyword(s):  
Wind Turbine ◽  
Fem Analysis ◽  
Utilization Rate ◽  
Finite Element Program ◽  
Model Calculations ◽  
Tower Structure ◽  
Element Program ◽  
Strength And Stiffness ◽  
Material Utilization ◽  
Large Wind

At present, frustum tower is widely used in the large wind turbine on the international wind electric market, which is a typical high drumstick and dumbbell type high-rise structure, whose mechanical characteristics and design methods have some particularity. In this paper, using the finite element program SAP2000, the primary selection tower was carried on the static strength and stiffness analyses, some control indexes which affect the tower design were studied. Based on the FEM analysis results, combining with a great deal of model calculations, this kind of tower were optimized. Research results show that the material utilization rate of wind turbine tower is low, and that the top displacement and stiffness of the tower is the controlling factors of design. Based on the optimization results, a new tower with straight lower part and frustum upper part is proposed, which can increase stiffness of tower, improve the material utilization, and reduce the overall steel amount of tower.

Evaluation for Adhesion Strength of High Performance Coatings by Pressure-Pushing Method and Analysis of Finite Elements

2012 ◽  
Vol 499 ◽  
pp. 74-78
Author(s):  
X. Cheng ◽  
J. Yan ◽  
H.Y. Wang ◽  
Dun Wen Zuo
Keyword(s):  
Adhesion Strength ◽  
High Performance ◽  
Static Load ◽  
Test Sample ◽  
The Finite Element Method ◽  
Correct Evaluation ◽  
Performance Bond ◽  
Stress Boundary Conditions ◽  
Method Of Evaluation ◽  
Stress Boundary

Pressure-pushing method of evaluation for adhesion strength of high performance coatings material and substrate is presented. This method, based on the pressure-testing device of high performance bond strength test sample patent, is one that the sample is cracking along the interface by putting the static load. According to the sample’s stress boundary conditions, the formula of the adhesion strength is given. The surface coating/substrate interface stress distribution is analyzed by using the finite element method, which provides the theory basis for the correct evaluation of coating/substrate strength. The experiments are conducted on the strength of common coating substrate materials as well. All the results show that pushed method can test the adhesion strength of high performance coatings and substrate, whose data is smaller than the international standard and A STMC633-79. And the experimental data of the pushed method are free from the influence of random factors.

Dynamic and Static Load Testing and Analysis for Dutou Major Bridge

2011 ◽  
Vol 250-253 ◽  
pp. 3479-3483
Author(s):  
An Ming Wang ◽  
Yu Min Zhang ◽  
Huan Li ◽  
Jing Chao Jia ◽  
Xing Feng
Keyword(s):  
Static Load ◽  
Test Methods ◽  
Load Testing ◽  
Test Results ◽  
Test Load ◽  
Observation Methods ◽  
Flexible Working ◽  
Strength And Stiffness ◽  
Static Load Testing

Dynamic and static load testing for Dutou major Bridge was conducted. the test projects, the layout of measuring points and observation methods, test loadings, test methods, test results were presented, the test results showed that the strength and stiffness behavior of the bridge could meet the requirements of designation, the structure lied in a flexible working stage under test load.

Study of Load Test of Pedestrian Suspension Bridge

2010 ◽  
Vol 163-167 ◽  
pp. 2670-2673
Author(s):  
Yun Liu ◽  
Dong Huang Yan
Keyword(s):  
Static Load ◽  
Suspension Bridge ◽  
Load Test ◽  
Static Load Test ◽  
Element Analysis ◽  
Pedestrian Bridge ◽  
The Finite Element Analysis ◽  
Field Static ◽  
Strength And Stiffness ◽  
Test Loading

This study focuses on test loading program and evaluation for pedestrian bridge. On the basis of the finite element analysis, numerical model of Lv River Bridge, which is a steel box pedestrian suspension bridge, is established. Moreover, field static load test is done and the results of tests are compared to the theoretical values. Results show that the measured result fits well with the theoretical result and bridge is in the situation of elastic deformation, and the strength and stiffness satisfy the need of design.

Underground Barrier Protection against the Spread of Vibration - A Model Study

2014 ◽  
Vol 1020 ◽  
pp. 451-456
Author(s):  
Tomáš Petřík ◽  
Eva Hrubesova ◽  
Miroslav Pinka ◽  
Alice Hastíková
Keyword(s):  
Finite Element Method ◽  
Urban Areas ◽  
Seismic Waves ◽  
Static Load ◽  
Geological Environment ◽  
The Finite Element Method ◽  
Ground Vibrations ◽  
Industrial Activity ◽  
Model Study ◽  
The Stability

The designs of the buildings are in addition to the static load exposed to ground vibrations spreading from the surrounding geological environment. Ground vibrations, which are produced by anthropogenic phenomena, are not usually the crucial load for the stability of the building. But this load have an adversely affect the walls of buildings or sensitive equipment in these buildings. This article will be deal with model study of underground barriers utilized as a protection against the spread of ground vibrations in geological environment. These underground barriers maybe used in the vicinity of roads or railway lines or in urban areas around the halls with heavy industrial activity. Material of underground barriers will be designed from material with different parameters, so that it could be assessed the best variant in terms of absorption of seismic waves. The different variations of the thickness of underground barriers and different distances from the source of vibration will be designed in the analysis. The analysis will be performed in mathematical models that will be created in the software’s based on the finite element method.

Experimental Study on Creep and Mechanical Behavior of Modern Bamboo Bridge Structure

2012 ◽  
Vol 517 ◽  
pp. 141-149 ◽  
Author(s):  
Lei Li ◽  
Yan Xiao ◽  
Rui Zhen Yang
Keyword(s):  
Creep Test ◽  
Experimental Results ◽  
Original Structure ◽  
Loading Test ◽  
Long Span ◽  
Laminated Bamboo ◽  
Relative Air Humidity ◽  
Bridge Structures ◽  
Strength And Stiffness ◽  
Truck Load

A full-scale testing model of laminated bamboo truck load bridge was made based on the original structure. The mid-span deflection of CFRP-reinforced bamboo girders, temperature and relative air humidity were obtained through over three years creep test under self-weight, and the analysis based on experimental results was finished. The results indicate that the average creep deflection of the girders after three years is approximately 8-mm. In addition, the increase in temperature and humidity may contribute to creep. On the basis of creep test, a short-term loading test was carried out applied with dead load, and the bridge collapsed under the load of 18.5-t. By the analysis of the experimental results, it is realized that long span CFRP-reinforced bamboo girders have sufficient capacity to meet the strength and durability needs of practical use. Although CFRP layers could improve the performance of bamboo girders effectively, there is a decrease in strength and stiffness when considering the long-term performance. All these studies may contribute to improving the design of bamboo bridge structures, and some construction measures are suggested for the bamboo bridge according to the results of the experimental and analysis results.

scholarly journals Mathematical computer-based modelling of biomechanical behavior of intramedullary nailing for supracondylar femoral bone fractures

2014 ◽  
Vol 18 (1 (69)) ◽  
Author(s):  
A. V. Kalashnikov ◽  
O. A. Tiazhelov ◽  
J. V. Lazarenko
Keyword(s):  
Intramedullary Nailing ◽  
Femur Fracture ◽  
Bone Fractures ◽  
Articular Surface ◽  
The Finite Element Method ◽  
Ao Classification ◽  
Biomechanical Behavior ◽  
Computer Based ◽  
Strength And Stiffness ◽  
Fractures Of The Femur

The research of the mode of deformation of the “femur - fixation device” system is done for intramedullary nailing of the distal end fractures of the femur (fracture A1 in AO classification) by the finite element method. The models differ by their distance between the plane of fracture and the articular surface of the femur: model 1 – the plane of the fracture is 5 cm from the articular surface of the femur; model 2 – the plane of the fracture is 6,5 cm from it; model 3 – theplane of the fracture is 8 cm from the articular surface of the femur. The received results convincingly demonstrate the advantage, both in terms of strength and stiffness, of the connection formed by intramedullary nailing on the distance of 8cm (model 3).

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