scholarly journals Simulation of Wrinkling during Bending of Composite Reinforcement Laminates

Materials ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2374 ◽  
Author(s):  
Jin Huang ◽  
Philippe Boisse ◽  
Nahiène Hamila ◽  
Yingdan Zhu
Keyword(s):  
Numerical Simulation ◽  
Finite Elements ◽  
Boundary Conditions ◽  
Process Parameters ◽  
Numerical Approach ◽  
Optimal Process ◽  
Composite Manufacturing ◽  
Stress Resultant ◽  
History Of ◽  
Good Agreement

When a thick laminate is subjected to bending, under certain boundary conditions, wrinkles may appear and develop due to the inextensibility of the fibers. Wrinkling is one of the most critical defects in composite manufacturing. Numerical simulation of the onset and growth of such wrinkles is an important tool for defining optimal process parameters. Herein, several bending experiments of thick laminates are presented. They were found to lead to severe wrinkling and delamination of different kinds. It is shown that the history of loading changed the developed wrinkles. Stress resultant shell finite elements specific to textile reinforcement forming show their relevance to provide, for these wrinkles induced by bending, results in good agreement with the experiments, both with regard to the onset of the wrinkles and to their development. This numerical approach was used to improve the understanding of the phenomena involved in wrinkling and to define the conditions required to avoid it in a given process.

Study on Vertical Earth Pressure of Slab Culvert under High Embankment

2012 ◽  
Vol 256-259 ◽  
pp. 1898-1902 ◽  
Author(s):  
Bao Kuan Ning ◽  
He Fan ◽  
Lei Gong ◽  
Guo Qing Liu
Keyword(s):  
Numerical Simulation ◽  
Boundary Conditions ◽  
Field Test ◽  
Structural Design ◽  
Earth Pressure ◽  
Test Results ◽  
Soil Pressure ◽  
Vertical Earth Pressure ◽  
The Impact ◽  
Good Agreement

With the increasing of embankment culvert engineering applications, there has been due in part to the structural design is too conservative and not economic or select unreasonable structural form, leading to the phenomenon of cracking or even collapse of the culvert structure, and the phenomenon has seriously affected the normal use of the highway. In this paper, the numerical simulation of vertical earth pressure distribution on different structural forms of embankment on culverts, to discuss the impact of boundary conditions, fill height, the thickness of the culvert culverts vertical earth pressure. Combined with Heda highway a culvert covert field test results and numerical simulation results were compared and analyzed. The results show that the numerical simulation and field test results in good agreement with the culvert structure in the form of vertical earth pressure of the embankment culverts have a greater impact; the structure of different forms of the culvert in the upper soil pressure is significantly different. In addition, analysis of the impact of boundary conditions, filling height of culvert vertical earth pressure values. The results can reference for the study of the structural design of the embankment culverts security.

Numerical Simulation of Impeller–Volute Interaction in Centrifugal Compressors

1999 ◽  
Vol 121 (3) ◽  
pp. 603-608 ◽  
Author(s):  
K. Hillewaert ◽  
R. A. Van den Braembussche
Keyword(s):  
Numerical Simulation ◽  
Boundary Conditions ◽  
Unsteady Flow ◽  
Centrifugal Compressor ◽  
Three Dimensional ◽  
Numerical Procedure ◽  
Flow Calculation ◽  
Total Temperature ◽  
Temperature And Pressure ◽  
Good Agreement

A numerical procedure to predict the impeller–volute interaction in a single-stage centrifugal compressor is presented. The method couples a three-dimensional unsteady flow calculation in the impeller with a three-dimensional time-averaged flow calculation in the volute through an iterative updating of the boundary conditions on the interface of both calculation domains. The method has been used to calculate the flow in a compressor with an external volute at off-design operation. Computed circumferential variations of flow angles, total temperature, and pressure are shown and compared with measurements. The good agreement between the predictions and measurements confirms the validity of the approach.

scholarly journals Optimization and Application of Process Parameters in an AZ61 Alloy Twin-Roll Strip Casting

2013 ◽  
Vol 773-774 ◽  
pp. 130-136 ◽  
Author(s):  
Jin Tao Li ◽  
Guang Ming Xu ◽  
Hai Liang Yu ◽  
Li Hong Su ◽  
Guan Yu Deng ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
Process Parameters ◽  
Strip Casting ◽  
Rolled Strip ◽  
Optimal Process ◽  
Good Surface ◽  
Az61 Magnesium Alloy ◽  
Twin Roll

Twin-roll strip casting is a concerned technology for economically producing magnesium alloys sheets. In this paper, numerical simulation of the twin-roll strip casting of an AZ61 magnesium alloy was carried out and the optimal process parameters were obtained. Then, under the conditions obtained through simulation, AZ61 strips of good surface quality were successfully manufactured. The microstructure of the alloy by twin-rolled strip casting is obvious refined compared with that by conventional casting.

Numerical Simulation of Stamping Forming for an Automobile Reinforced Plate Based on Orthogonal Test

2012 ◽  
Vol 602-604 ◽  
pp. 1899-1902
Author(s):  
Ming Wei Wang ◽  
Long Chen ◽  
Xiu Jun Zhao ◽  
Shu Li
Keyword(s):  
Numerical Simulation ◽  
Friction Coefficient ◽  
Analysis Of Variance ◽  
Process Parameters ◽  
Orthogonal Test ◽  
Blank Holder Force ◽  
Optimal Process ◽  
Blank Holder ◽  
Reinforced Plate ◽  
Result Analysis

The effects of stamping process parameters (blank thickness, blank holder force, friction coefficient, die clearance) on the formability of an automobile reinforced plate were investigated. The process parameters are optimized based on the results of orthogonal testing. The optimal process parameters were obtained by simulation result analysis of variance. The accuracy of numerical simulation is verified by the experiment, which provides guidance for the actual production.

Numerical Simulation for the Motion of the Flexible Floating Collision-Prevention System

2013 ◽  
Vol 135 (1) ◽  
Author(s):  
Xu-jun Chen ◽  
Guang-yuan Huang ◽  
Guang-huai Wu ◽  
Xue-feng Tang
Keyword(s):  
Numerical Simulation ◽  
Model Test ◽  
Calculation Method ◽  
Iterative Calculation ◽  
Collision Prevention ◽  
Prevention System ◽  
Movement Distance ◽  
History Of ◽  
The Relationship ◽  
Good Agreement

The flexible floating collision-prevention system (FFSCS) is a valuable floating engineering structure that can be used to prevent the uncontrolled ships to collide with the non-navigational bridge of a large sea-crossing bridge. The system is composed of buoys, block chains, mooring chains and gravity anchors. The deformation of the system under the acting of an uncontrolled ship as well as the movement distance of the gravity anchors are important factors that should be considered by the system designers. Based on the analysis of the relationship between the forces and the deformation of each part of the system, the approximately static equations are solved by a new numerical iterative calculation method. The position changes of the buoys, the movements of the anchors and the history of the inner forces of the block chains when a ship collides with the FFSCS are obtained by iterative calculation. The good agreement between the numerical value and the results of the model test indicate that the small balance method is a validation on the motion response simulation of the FFSCS under the acting of the uncontrolled ship. The results validate that FFSCS can stop the uncontrolled ship before it arrives at the place of the bridge.

Using Numerical Simulation in the Optimization of the Finishing Phases in Ceramic Tiles Manufacturing

2017 ◽  
Vol 754 ◽  
pp. 127-130
Author(s):  
A. Radovanovic ◽  
M. Mladenovic ◽  
G. Campana ◽  
M. Mele
Keyword(s):  
Numerical Simulation ◽  
Finite Elements ◽  
Low Cost ◽  
Large Family ◽  
Numerical Approach ◽  
Ceramic Tiles ◽  
Fundamental Part ◽  
Complex Process ◽  
Porcelain Tiles

The Grés Porcelain stoneware surely represents a remarkable material for building inside the large family of constructive ceramics. It is appreciated in consideration of its superior properties of resistance and functionality, especially when considered respect to a relatively low cost. Billions of square meters of Grés Porcelain are produced worldwide each year, primarily in form of tiles of every dimension, thinness, color, decoration, in the way that the ceramic tile industry represents a relevant economy. But the tile manufacturing is a complex process, made by different stages and productive plants to be deeply investigated and optimized. This paper describes the use of Finite Elements for modelling and optimizing the production of Grés Porcelain tiles with special attention to the ending phases of the process, just after the treatments in kiln and realized by tool machining. The case study, used to redesign a fundamental part of a finishing machine driven by a numerical approach, is also detailed.

scholarly journals Formation of Oriented Fibers Using Injection of PEO Solutions inside Electric Fields Defined by Two Parallel Suspended Electrodes

2011 ◽  
Vol 6 (2) ◽  
pp. 122-126
Author(s):  
Rogerio Furlan ◽  
Joel A. M. Rosado ◽  
Ana Neilde Rodrigues Da Silva
Keyword(s):  
Numerical Simulation ◽  
Electric Field ◽  
Boundary Conditions ◽  
Electric Fields ◽  
Polyethylene Oxide ◽  
Comsol Multiphysics ◽  
Polymeric Solution ◽  
Field Distributions ◽  
Good Agreement

Formation of oriented fibers using injection of polyethylene oxide (PEO) solutions inside electric fields defined by two parallel suspended electrodes is investigated. Images of streams formed with the injection of a large amount of polymeric solution reveal good agreement with electric field distributions obtained with numerical simulation (COMSOL Multiphysics) when appropriate boundary conditions are defined. Oriented fibers with diameters in the range of hundreds of nanometers to micrometers result connected between electrodes (separated by several centimeters) and can be easily collected/transferred keeping their orientation. Fibers with this characteristic find applications in topics such as tissue and sensors engineering. Also, the fibers are flexible and can be shaped with the stylus of a profilometer.

Design of LPDC Process for Thin-Walled Casting Based on Numerical Simulation

2012 ◽  
Vol 217-219 ◽  
pp. 1786-1790
Author(s):  
Li Qiang Zhang ◽  
Rong Ji Wang
Keyword(s):  
Numerical Simulation ◽  
Aluminum Alloy ◽  
Boundary Conditions ◽  
Process Parameters ◽  
Casting Process ◽  
Manufacturing Cost ◽  
Simulation Technology ◽  
Thermal Boundary Conditions ◽  
Thin Walled

The LPDC process parameters of A356 thin-walled aluminum alloy were designed based on numerical simulation by precisely setting the thermal boundary conditions. By applying the designed process parameters, a sound casting with 300mm in length, 100mm in width and 1.5mm in thickness was successfully prepared. The results indicate the numerical simulation technology is an effective tool for designing casting process and reducing the manufacturing cost.

3D Simulation and Experimental Validation of an Electrically-Excited Flow in a Folded Microchannel

2006 ◽  
Author(s):  
Dominik P. J. Barz ◽  
Hamid Farangis Zadeh ◽  
Peter Ehrhard
Keyword(s):  
Mathematical Model ◽  
Finite Elements ◽  
Flow Field ◽  
Boundary Conditions ◽  
Experimental Validation ◽  
Three Dimensional ◽  
Numerical Treatment ◽  
Matching Procedure ◽  
Asymptotic Matching ◽  
Good Agreement

We investigate the flow field in a folded microchannel, which serves as an essential part of an electrically-excited micromixer. A mathematical model that allows for the numerical treatment of the channel core is developed. The boundary conditions at the walls are implemented by means of an asymptotic matching procedure. Three-dimensional finite-elements simulations are performed and verified against experiments. The comparison shows good agreement.

Numerical Simulation of Impeller–Volute Interaction in Centrifugal Compressors

1998 ◽  
Author(s):  
Koen Hillewaert ◽  
René A. Van den Braembussche
Keyword(s):  
Numerical Simulation ◽  
Boundary Conditions ◽  
Unsteady Flow ◽  
Centrifugal Compressor ◽  
Three Dimensional ◽  
Numerical Procedure ◽  
Flow Calculation ◽  
Total Temperature ◽  
Temperature And Pressure ◽  
Good Agreement

A numerical procedure to predict the impeller/volute interaction in a single-stage centrifugal compressor is presented. The method couples a three-dimensional unsteady flow calculation in the impeller with a three-dimensional time-averaged flow calculation in the volute through an iterative updating of the boundary conditions on the interface of both calculation domains. The method has been used to calculate the flow in a compressor with an external volute at off-design operation. Computed circumferential variations of flow angles, total temperature and pressure are shown and compared with measurements. The good agreement between the predictions and measurements confirms the validity of the approach.

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