scholarly journals Influence of Strengthening Material Behavior and Geometry Parameters on Mechanical Behavior of Biaxial Cruciform Specimen for Envelope Material

Materials ◽  
2019 ◽  
Vol 12 (17) ◽  
pp. 2680
Author(s):  
Zhipeng Qu ◽  
Houdi Xiao ◽  
Mingyun Lv ◽  
Xihe Wang ◽  
Pengfei Wang ◽  
...  
Keyword(s):  
Theoretical Model ◽  
Mechanical Behavior ◽  
Central Region ◽  
Limit State ◽  
Material Behavior ◽  
Biaxial Stress ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Envelope Material ◽  
Stress Ratios

The stratospheric airship envelope material is operated in biaxial stress, so it is necessary to study the in-plane biaxial tensile strength. In this paper, a theoretical model is developed to evaluate the mechanical properties of in-plane biaxial specimens. Being applied to the finite element analysis, the theoretical model is employed to evaluate the influence of strengthening material behavior (E*) and geometry parameters on the mechanical behavior in the central. The follows results are drawn: (i) smaller the length of the central region (Lcen), E* and larger the central region corner radius (r) contribute to smaller coefficient of variation (CV); (ii) smaller Lcen and larger E* contribute to smaller stress concentration factor (k), k in the limit state of r is larger than that in other conditions. (iii) The CV and k under stress ratio of 1:1 are smaller than those under other stress ratios. The study can provide a useful reference for the design of biaxial specimens.

Leveling Quality Prediction Algorithm

2015 ◽  
Vol 809-810 ◽  
pp. 235-240
Author(s):  
Catalina Maier ◽  
Robin Gauthier
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Theoretical Model ◽  
Cumulative Effect ◽  
Prediction Algorithm ◽  
Forming Process ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Experimental Values ◽  
Different Characteristics

Roller leveling is a forming process which used to minimize flatness imperfection and residual stresses by repeated forming process of a sheet metal. The determination of the machine settings must be very accurate and ask a precise mechanical study. In order to determine an algorithm which can predict the leveling quality according to the machine settings we start by a theoretical model of stress evolution during the process. The plastification ratio is deducted from this one and the values obtained by this approach are compared whit experimental values. The finite element analysis is performed, in second step in order to assure a good accuracy of the prediction algorithm. Theoretical study determines a minimum of the plastification ratio according to the machine settings. The finite element analysis gives more accurate results due to the consideration of different characteristics of the process, neglected by the theoretical model: cumulative effect of bending/unbending with stretching of the sheet during the passing between each couple of rolls, boundary conditions at the limit of the material deformed by two adjoining couples of rolls, friction force.

Finite Element Modeling of Biodegradable Stents

2013 ◽  
Author(s):  
Nic Debusschere ◽  
Matthieu De Beule ◽  
Peter Dubruel ◽  
Patrick Segers ◽  
Benedict Verhegghe
Keyword(s):  
Finite Element ◽  
Mechanical Behavior ◽  
Mechanical Performance ◽  
Cost Effective ◽  
Minimal Invasive ◽  
Material Behavior ◽  
Element Analysis ◽  
Design And Optimization ◽  
Stent Restenosis ◽  
Biodegradable Stents

Biodegradable stents, which temporarily support a stenotic blood vessel and afterwards fully disappear, have recently gained a lot of interest. They avoid long-term complications associated with conventional stents such as late stent thrombosis and in-stent restenosis. Moreover, degradable stents allow for a restoration of vasomotion and vessel growth which makes them particularly suitable for pediatric applications [1]. Finite element simulations have proven to be an efficient and cost-effective tool to investigate and optimize the mechanical performance of minimal invasive devices such as stents [2]. Biodegradable stents have however created new challenges in their design and optimization via finite element analysis because of their complex time-varying material behavior. To correctly simulate the mechanical behavior of biodegradable stents, a model should be developed that incorporates the effect of degradation upon all material characteristics. By combining existing constitutive material models based on continuum damage theory we were able to create such a virtual environment in which the transitional mechanical behavior of biodegradable stents can be investigated.

Checking and Strengthening Scaffolding of the Home Block for Hanging Cradle Construction of Qinhe Bridge

2013 ◽  
Vol 438-439 ◽  
pp. 926-929
Author(s):  
Ji Hao Chen ◽  
Yu Jia Gao ◽  
Sen Liu ◽  
Yong Peng Sun
Keyword(s):  
Limit State ◽  
Potential Danger ◽  
Load Case ◽  
Analysis Software ◽  
Element Analysis ◽  
Design Strength ◽  
Horizontal Tubes ◽  
The Finite Element Analysis ◽  
Actual Load ◽  
State Method

In order to ensure the safety of the scaffolding of the home block for hanging cradle construction, this paper makes use of probabilistic limit state method, and carries out the checking computation. According to the actual drawings of the Qinhe bridge and the actual load case, the analytical model is established through the finite element analysis software MIDAS/CIVIL. The results show that the slant tube may be flexural buckling, and the stress of side standing tube is over the design strength of material, so that there is potential danger of the scaffolding. After the horizontal tubes were installed along the boundary of scaffolding, the stresses of all tubes are less than the design strength of corresponding material.

The Effect of Splicing Area Parameters on Mechanical Behavior of Beam-Column Connection with Cantilever Beam Splicing

2014 ◽  
Vol 919-921 ◽  
pp. 258-261
Author(s):  
Jian Rong Pan ◽  
Zheng Ting Yang ◽  
Lin Qiang Zheng ◽  
Rui Bin Gao
Keyword(s):  
Mechanical Behavior ◽  
Cantilever Beam ◽  
Ultimate Load ◽  
Design Method ◽  
Great Influence ◽  
Design Parameters ◽  
Rotational Stiffness ◽  
Element Analysis ◽  
Yield Load ◽  
The Finite Element Analysis

This paper deals with the effect of splicing area design parameters on the mechanical behavior of beam-column connection with cantilever beam splicing. A series of models are designed based on the change of parameters. The mechanical behavior of beam-column connection with cantilever beam splicing is systematically studied by using the finite element analysis. The analysis results show that the number and arrangement of web bolt will have a great influence on mechanical behavior of the splicing joint when the number of flange bolt is designed by the precise design method; the number and arrangement of web bolt will have a less influence when the number of flange bolt is designed by the equal strength design method; Splicing area design parameters have little effect on the ultimate load and the initial rotational stiffness of the splicing joint; the number and arrangement of bolt is sensitive parameter for yield load of the splicing joint and the rotational stiffness in the the splicing area.

Mechanical Behavior of Hollow Steel-Concrete Composite Columns with Perforated Ribs

2011 ◽  
Vol 255-260 ◽  
pp. 619-623
Author(s):  
Yao Zeng ◽  
Chong Wu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Mechanical Behavior ◽  
Bearing Capacity ◽  
The Other ◽  
Element Analysis ◽  
Composite Columns ◽  
The Finite Element Analysis ◽  
The One ◽  
Relationship Of

Two different specimens of hollow composite columns with perforated ribs, one is the column with double steel skin and the other is with single steel skin, were designed for imposing axial compression test. The tests indicated that both of the columns have a good bearing capacity and the column with double steel skin has a comparatively better bearing capacity than the one with single steel skin. Then comparisons between tests and finite element analysis (FEA) were preceded, which showed that not only the load-displacement relationship of the columns, but also a reasonable failure mode can be simulated by the finite element analysis.

Study on the Mechanical Properties of the Hydropneumatic Fender

2010 ◽  
Vol 34-35 ◽  
pp. 1294-1298
Author(s):  
Jing Jun Lou ◽  
Dao Zhou Chen ◽  
Shi Jian Zhu ◽  
Xiao Qiang Wang
Keyword(s):  
Mechanical Properties ◽  
Theoretical Model ◽  
Energy Absorption ◽  
Reaction Force ◽  
Element Analysis ◽  
Volume Percentage ◽  
The Finite Element Analysis ◽  
Reaction Forces ◽  
And Performance ◽  
Theoretical Results

The dynamics and performance of hydropneumatic fender were studied. A theoretical model of the hydropneumatic fender was established to calculate its reaction forces and energy absorption capability. The influences of the length, diameter, volume percentage of water, and the internal air pressure upon the mechanical properties were analyzed. The reaction force and energy absorption capability of the hydropneumatic fender were numerically studied with the finite element analysis software MSC.Dytran. The numerical results were in agreement with the theoretical results, which showed that the theoretical model has well accuracy and is significative for the design of the hydropneumatic fender.

Rhombus Cradle System Checking Computation of Jinqinggang Bridge

2012 ◽  
Vol 238 ◽  
pp. 689-693
Author(s):  
Shi Ming Liu ◽  
Zu Lin Yang ◽  
Hui Zhao
Keyword(s):  
Limit State ◽  
Material Design ◽  
Analysis Software ◽  
Local Pressure ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Actual Load ◽  
Design Value ◽  
State Method ◽  
Pressure Stress

In order to be sure the safety of rhombus cradle system during the concretes cantilever cast-in-place construction, the paper makes use of probabilistic limit state method, and carries out the checking computation. According to the rhombus cradle design drawings of the Jinqinggang bridge and the actual load case, the analytical model is founded through the finite element analysis software MIDAS/CIVIL. The results show that stress of all parts of the rhombus cradle system and the concrete local pressure stress is less than the corresponding material design value, and the safety factor of anchor rod tensile stress is less than 2.0 which should be strengthened, and the deformation of the steel moulding plate is less than 20mm.

The Finite Element Analysis of Mechanical Behavior of New Connection

2014 ◽  
Vol 1065-1069 ◽  
pp. 1281-1284
Author(s):  
Chun Gang Wang ◽  
Xu Wang ◽  
Guo Chang Li ◽  
Jin Guo Wu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Mechanical Behavior ◽  
New Wave ◽  
Calculation Methods ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Simulation Results ◽  
Vibration Wave ◽  
Better Than

Purlin connections have important influence on the stiffness, bearing capacity and the purlin calculation methods. A new kind of purlin connection was put forward in this paper. The mechanical behavior of the new connection was studied by finite element analysis using software ANSYS. As can be seen from the simulation results, the new connection can enhance the stiffness of purlin, and effect of each new wave connection is better than the promotion of purlin stiffness in the vibration wave connection. New connection has a better promotion effect for small stiffness of purlin.

Mechanical Behavior of Steel-Encased Concrete Filled Prefabricated FRP Tubes Short Column under Axial Compression Based on ABAQUS

2012 ◽  
Vol 256-259 ◽  
pp. 749-753
Author(s):  
Hai Xia Zhang ◽  
Peng Peng Cao ◽  
Jing Yao ◽  
Chen Fang
Keyword(s):  
Mechanical Behavior ◽  
Axial Compression ◽  
Mechanical Performance ◽  
Full Range ◽  
Element Analysis ◽  
Composite Column ◽  
Short Column ◽  
The Finite Element Analysis ◽  
Simulation Results ◽  
Frp Tubes

The paper presents numerical analysis on steel-encased concrete filled prefabricated FRP (fiber reinforced polymer) tubes short column through the finite element analysis software ABAQUS and verifies simulation results compared with experimental results in order to investigate the mechanical behavior of the composite column under axial compression. Based on the correct simulation results, the full-range study combined with the concrete, steel and FRP tubes of stress distribution, the mechanical performance of the column are studied in this paper. The research shows that the stress-displacement of composite column calculated in the paper can be divided into three stages, namely, elastic stage, elastic-plastic stage and failure stage.

Sign in / Sign up

Export Citation Format

Share Document