scholarly journals Formation of Arbitrary Patterns in Ultraviolet Cured Polymer Film via Electrohydrodynamic Patterning

2014 ◽  
Vol 2014 ◽  
pp. 1-9
Author(s):  
Xin Li ◽  
Yucheng Ding ◽  
Jinyou Shao ◽  
Hongmiao Tian ◽  
Hongzhong Liu
Keyword(s):  
Finite Element ◽  
Finite Element Simulation ◽  
Polymer Film ◽  
Applied Voltage ◽  
Great Influence ◽  
Critical Parameters ◽  
High Fidelity ◽  
Field Coupling ◽  
Element Simulation ◽  
Electrohydrodynamic Patterning

Electrohydrodynamic patterning of arbitrary patterns is achieved by optimizing the critical parameters (applied voltage and spacer height). The applied voltage has a great influence on the fidelity of L-shaped line structures with different sizes. The L-shaped line structures with high fidelity are obtained by using the moderate applied voltage. The spacer height has a great influence on the fidelity of square structures with different sizes. The square structures with high fidelity are obtained by using the low height spacer. The multi-field coupling transient finite element simulation demonstrates that the lack of polymer owing to the high height spacer leads to the formation of defects.

Analysis and Simulation on the Influencing Factors of Braking Force for Permanent Magnetic Brake

2013 ◽  
Vol 278-280 ◽  
pp. 278-281 ◽  
Author(s):  
Ming Yao ◽  
Liang Wang
Keyword(s):  
Finite Element ◽  
Simulation Model ◽  
Finite Element Simulation ◽  
Influencing Factors ◽  
Great Influence ◽  
Element Simulation ◽  
Working Principle ◽  
Main Factors ◽  
Braking Force ◽  
Theory Formula

The structure and working principle of permanent magnetic brake were introduced and the main factors of influencing braking ability of the permanent magnetic brake were analyzed with theory formula. By using of software as Ansoft, an finite element simulation model for magnetic brake were built up, and compare simulate value with theoretical one express that they have better consistency. Based on the simulation model, influencing factors of the braking force about permanent magnetic brake were analyzed, and the simulate results express that the height of gap between brake and track has a great influence on the braking force, so it must pay much more attention on brake design.

Comparison of Different Extrapolation Models for Materials in the Closed-Extruding Fine Blanking Simulation

2018 ◽  
Vol 1145 ◽  
pp. 123-128
Author(s):  
Ming Deng ◽  
Jiang Po Niu ◽  
Yi Long Ma ◽  
Lin Lv
Keyword(s):  
Finite Element ◽  
Flow Stress ◽  
Finite Element Simulation ◽  
Great Influence ◽  
Stress Model ◽  
Forming Process ◽  
Fine Blanking ◽  
Finite Element Software ◽  
Element Simulation ◽  
Flow Stress Model

The selection of the flow stress model of materials has a great influence on the plastic forming simulation of metal. For closed extrusion fine blanking, selecting the accurate and appropriate material flow stress model can make the finite element simulation closer to the real situation, and the simulation data is more reliable. In order to solve the accuracy problem of finite element simulation closed-extruding fine blanking, 5 types of flow stress fitting curve equations were obtained based on the data of sheet metal tensile test. With the secondary development of finite element software Deform-2D, the circular piece of closed-extruding fine blanking forming process was simulated, whose diameter is 14 mm and thickness is 30 mm. The simulation results of different rheological models were compared after physical experiment being carried out.The results show that Ludwik extrapolation rheological model is suitable for finite element simulation of closed-extruding fine blanking technology, which effectively improves closed-extruding fine blanking simulation accuracy. Lay the foundation for the application of closed-extrusion fine blanking in industry.

Finite Element Simulation of Residual Stress on the Surface in the Cutting Considering Tool Flank Wear

2010 ◽  
Vol 431-432 ◽  
pp. 338-341
Author(s):  
Hai Tao Liu ◽  
Ya Zhou Sun ◽  
Ze Sheng Lu
Keyword(s):  
Residual Stress ◽  
Finite Element ◽  
Finite Element Simulation ◽  
Flank Wear ◽  
Great Influence ◽  
Machining Accuracy ◽  
Surface Residual Stress ◽  
Machined Surface ◽  
Tool Flank Wear ◽  
Element Simulation

Deformation caused by residual stress has been one of the main reasons influencing the machining accuracy, studies on machining residual stress should be performed. The tool flank wear on the cutting process has great influence on cutting heat which will infulence the distribution of residual stress, therefore,we should do the finite element simulation of cutting tool flank wear on the heat-affected firstly,then simulate and forecast the surface residual stress, studies on the effect of tool flank wear on the distribution of machined surface residual stress Johnson-Cook’s coupled thermal-mechanical model is used as workpiece material model, thermal-displacement coupled brick are used to mesh, while friction between tool and work piece uses modified Coulomb's law whose slide friction area is combined with sticking friction. By means of FEA, residual stress on the machined surface and cutting temperature under different tool flank wear conditions are obtained. The results are compared and analyzed, and then we can get the fundamental influencing law on machined surface residual stress of tool flank wear.

scholarly journals Finite Element Simulation of Multi-Scale Bedding Fractures in Tight Sandstone Oil Reservoir

Energies ◽  
2019 ◽  
Vol 13 (1) ◽  
pp. 131 ◽  
Author(s):  
Qianyou Wang ◽  
Yaohua Li ◽  
Wei Yang ◽  
Zhenxue Jiang ◽  
Yan Song ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Simulation ◽  
Principal Stress ◽  
Oil And Gas ◽  
Maximum Principal Stress ◽  
Critical Parameters ◽  
Yanchang Formation ◽  
Multi Scale ◽  
Element Simulation ◽  
Minimum Principal Stress

Multi-scale bedding fractures, i.e., km-scale regional bedding fractures and cm-scale lamina-induced fractures, have been the focus of unconventional oil and gas exploration and play an important role in resource exploration and drilling practice for tight oil and gas. It is challenging to conduct numerical simulations of bedding fractures due to the strong heterogeneity without a proper mechanical criterion to predict failure behaviors. This research modified the Tien–Kuo (T–K) criterion by using four critical parameters (i.e., the maximum principal stress (σ1), minimum principal stress (σ3), lamina angle (θ), and lamina friction coefficient (μlamina)). The modified criterion was compared to other bedding failure criteria to make a rational finite element simulation constrained by the four variables. This work conducted triaxial compression tests of 18 column samples with different lamina angles to verify the modified rock failure criterion, which contributes to the simulation work on the multi-scale bedding fractures in the statics module of the ANSYS workbench. The cm-scale laminated rock samples and the km-scale Yanchang Formation in the Ordos Basin were included in the multi-scale geo-models. The simulated results indicate that stress is prone to concentrate on lamina when the lamina angle is in an effective range. The low-angle lamina always induces fractures in an open state with bigger failure apertures, while the medium-angle lamina tends to induce fractures in a shear sliding trend. In addition, the regional bedding fractures of the Yanchang Formation in the Himalayan tectonic period tend to propagate under the conditions of lower maximum principal stress, higher minimum principal stress, and larger stratigraphic dip.

scholarly journals Orientation definition of anisotropy is important to finite element simulation of bone material properties

2008 ◽  
Author(s):  
Haisheng Yang ◽  
Tongtong Guo ◽  
Xin Ma
Keyword(s):  
Finite Element ◽  
Finite Element Simulation ◽  
Material Property ◽  
Material Properties ◽  
Great Influence ◽  
Biomechanical Analysis ◽  
Von Mises Stress ◽  
Bone Material ◽  
Bone Material Properties ◽  
Element Simulation

The assignment of bone material properties to finite element model is a fundamental step in finite element analysis and has great influence on analysis results. Most work done in this area has adopted isotropic assignment strategy as its simplicity. However, bone material is widely recognized as being anisotropic rather than isotropic. Therefore, this work is aimed to simulate the inhomogeneity and anisotropy of femur by assigning each element of the mesh model the material properties with a numerical integration method and properly defining the principal material orientation, and then compare the biomechanical analysis results of isotropic model with that of anisotropic model under six different loading conditions. Based on the analysis results of the equivalent Von Mises stress and the nodal displacement, four different regions of interest are chosen to achieve this comparison. The results show that significant differences between the two material property assignments exist in the regions where anisotropic material property is sensitive to orientation definition. Thus, orientation definition is important to finite element simulation of bone material properties.

High-fidelity finite element simulation of non-contact splices in column-drilled shaft connections

2021 ◽  
Vol 239 ◽  
pp. 112186
Author(s):  
Mahadi Masud ◽  
Hongbing Chen ◽  
Jiaji Wang ◽  
Jamshaid Sawab ◽  
Y.L. Mo ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Simulation ◽  
Drilled Shaft ◽  
High Fidelity ◽  
Element Simulation
Sign in / Sign up

Export Citation Format

Share Document