scholarly journals Numerical Simulation of Gas-Assisted Extrusion of Four-Lumen Micro-Catheter based on FEM Method

2020 ◽  
Vol 1622 ◽  
pp. 012050
Author(s):  
Zhong Ren
Keyword(s):  
Numerical Simulation ◽  
Fem Method ◽  
Micro Catheter

Shape Optimization and Strength Evaluation of Metal Welded Bellows Wave of Mechanical Seal

2008 ◽  
Vol 33-37 ◽  
pp. 1377-1382 ◽  
Author(s):  
Halida Musha ◽  
Mamtimin Gheni ◽  
Buhalqam
Keyword(s):  
Numerical Simulation ◽  
Bone Mass ◽  
Boundary Conditions ◽  
Shape Optimization ◽  
Reaction Diffusion ◽  
Mechanical Seal ◽  
Forming Process ◽  
Strength Evaluation ◽  
Fem Method ◽  
Initial Load

In this paper, the iBone (Imitation Bone) model which is coupled with Turing reaction-diffusion system and FEM, is used. The numerical simulation of bone forming process by considering the osteoclasts and osteoblasts process are conducted. The bone mass is increased with increase of the initial load value, then fibula and femur bones are obtained respectively by keeping the required bone forming value. The new S shape wave of metal welded bellow of mechanical seal are designed based on the the optimization results through this method. The S shape and V shape both were analyzed with FEM method. The same boundary conditions were given for two types of wave. The results are shown that the stresses mainly concentrated on the welded area. It is interesting that the value of the stresses of the two types of wave basically same. However, compressibility of the two types of wave is very different at the same computation stage. The compressibility of S shape wave was higher than V shape.

Numerical Simulation of Expansion Effect of MgO Concrete

2012 ◽  
Vol 212-213 ◽  
pp. 801-804 ◽  
Author(s):  
Jian Hua Cui ◽  
Han Jiang Xiao ◽  
Jie Su
Keyword(s):  
Numerical Simulation ◽  
Temperature Control ◽  
Temperature Drop ◽  
Dam Construction ◽  
Construction Technology ◽  
3D Fem ◽  
Fem Method ◽  
Good For ◽  
Mgo Concrete ◽  
Expansion Effect

The expansion effect of the MgO concrete must meet the requirement of the design for the temperature control. In this paper, its influence to the construction stress is studied using 3D FEM method. Results show that the expansion of MgO at later age is good for compensating the shrinkage induced by temperature drop and the expansion of MgO can improve the stress status in the constrained zones but may worsen the stress status in other zones. This provides the reference for popularizing dam construction technology with MgO concrete.

Numerical Simulation of Forming Process for Cover with Stiffening Components Made of Grade 2 Titanium Sheet Metal

2016 ◽  
Vol 687 ◽  
pp. 206-211
Author(s):  
Wojciech Więckowski
Keyword(s):  
Numerical Simulation ◽  
Sheet Metal ◽  
Empirical Studies ◽  
Strength Properties ◽  
Forming Process ◽  
Titanium Sheet ◽  
Plastic Properties ◽  
Fem Method

This study presents the findings of numerical simulations of forming process for an inspection hole cover with stiffening ribs made of thin grade 2 titanium sheet metal. The numerical simulation was carried out using the FEM method with PAMStamp 2G software. Numerical calculations were performed with consideration for the phenomenon of material strain hardening and anisotropy of plastic properties of the sheet metal formed. Properties of the grade 2 titanium alloy analysed in the simulations were adopted based on the results of the empirical studies. Adequate parameters of the forming process were selected in order to eliminate unfavourable phenomena of losing of material coherence and sheet metal wrinkling. The effect of conditions of friction between the sheet metal and tool and pressure force of the blank holder on the forming process was investigated. The analysis of the distribution of plastic strain and reduction in wall thickness of the drawn parts can be used for determination of the effect of changes in selected parameters and orientation of the specimen on the process of drawn part forming. The quality of drawn parts was assessed based on the shape inaccuracy determined during simulation of forming. The inaccuracy depended on the conditions of the process and strength properties of the titanium sheet metal.

Analysis and Numerical Simulation of the Mechanical Performance of FDM Samples With Variable Infill Values

2017 ◽  
Author(s):  
Steffany N. Cerda-Avila ◽  
Hugo I. Medellín-Castillo ◽  
Dirk F. de Lange
Keyword(s):  
Mechanical Properties ◽  
Numerical Simulation ◽  
Prediction Models ◽  
Mechanical Performance ◽  
Numerical Models ◽  
Research Work ◽  
Tensile Tests ◽  
Geometrical Shape ◽  
Cad System ◽  
Fem Method

The prediction of the mechanical properties of AM parts is very important in order to design and fabricate parts not only of any geometrical shape but also with variable or customized mechanical properties. A limited number of investigations have focused on the analysis and prediction of the mechanical properties of AM parts using theoretical and numerical approaches such as the Finite Element Method (FEM); nevertheless, their results have been not accurate yet. Thus, more research work is needed in order to develop reliable prediction models able to estimate the mechanical performance of AM parts before fabrication. In this paper the analysis and numerical simulation of the mechanical performance of FDM samples with variable infill values is presented. The aim is to predict the mechanical performance of FDM components using numerical models. Thus, several standard tensile test specimens were fabricated in an FDM system using different infill values, a constant layer thickness, one shell perimeter, and PLA material. These samples were measured and modelled in a CAD system before performing the experimental tensile tests. Numerical models and simulations based on the FEM method were then developed and carried out in order to predict the structural performance of the specimens. Finally the experimental and numerical results were compared and conclusions drawn.

Numerical Simulation of Rigid Cylindric Plate's Sinkage on Soil Based on SPH/FEM Method

2014 ◽  
Vol 1049-1050 ◽  
pp. 483-486
Author(s):  
Ting Xia ◽  
Gang He ◽  
Peng Hu ◽  
Xiao Long Li
Keyword(s):  
Numerical Simulation ◽  
Stress Distribution ◽  
Dynamic Simulation ◽  
Smoothed Particle Hydrodynamics ◽  
Mechanical Design ◽  
Material Model ◽  
Fem Method ◽  
Particle Hydrodynamics ◽  
Smoothed Particle ◽  
Simulation Results

Based on smoothed particle hydrodynamics (SPH) and FEM method, the dynamic simulation of rigid cylindric plate's sinking process on soil is studied with LS-DYNA software, and MAT 147 material model is used to describe soil's attributes. The stress distribution and flowing trend of the soil are compared at different period. The simulation results show that the SPH/FEM method is useful to analyze large deformation of soil, and our findings can give helps to the mechanical design of the components interacting with soil.

Study on the Calculating Method of Bending Stress for Non-Circular Gear

2011 ◽  
Vol 86 ◽  
pp. 337-341
Author(s):  
Ji Qang Li ◽  
Zhong Ming Liu ◽  
He Ping Zhang ◽  
Ling Xian Meng ◽  
Li Yong Zhang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Cantilever Beam ◽  
Form Factors ◽  
Beam Theory ◽  
Computational Error ◽  
Bending Stress ◽  
Calculating Method ◽  
Fem Method ◽  
Tooth Form

Profiles of non-circular gears and equivalent gears are compared in this paper, and profile differences are specifically investigated. Based on the cantilever beam theory, the calculating method of bending stress for non-circular gear is researched, and computational error by using equivalent gear instead of non-circular gear to calculate the bending stress is analyzed through the comparison of tooth form factors. Simultaneously, the numerical simulation of bending stress of non-circular gear is conducted on the basis of the FEM method. By the fitting curve comparison, the feasibility of using equivalent gear instead of non-circular gear to calculate the bending stress is testified.

VIV Simulation of 2-D Deformable Cylinder Using Coupled FDM/FEM Method

2012 ◽  
Author(s):  
Changhong Hu ◽  
Kangping Liao ◽  
Wengyang Duan
Keyword(s):  
Fluid Dynamics ◽  
Numerical Simulation ◽  
Circular Cylinder ◽  
Structural Dynamics ◽  
Vortex Shedding ◽  
Immersed Boundary Method ◽  
Immersed Boundary ◽  
Fem Method ◽  
Deformable Cylinder ◽  
Data Transferring

In this work a coupled finite difference method and finite element method (FDM/FEM) is developed for numerical simulation of vortex induced vibration (VIV) phenomenon with an elastically deformable circular cylinder. The algorithm is based on a FDM with CIP (Constraint Interpolation Profile) method to fluid dynamics and a FEM to solve structural dynamics. Coupling between FDM and FEM is realized by BGS (Block Gauss-Seidel) procedure. IB (Immersed Boundary) method is applied for data transferring on the interface between fluid and structure. In this paper, numerical simulations of a 2-D circular cylinder at low Reynolds number are carried out. The effect of stiffness of the cylinder shell on the vortex shedding is investigated.

A Study of Multiple Laser Shock Micro-Adjustment Using Numerical Simulation

2014 ◽  
Vol 621 ◽  
pp. 25-31
Author(s):  
Di Zhang ◽  
Chun Xing Gu ◽  
Jun Wei Yuan ◽  
Zong Bao Shen ◽  
Hui Xia Liu ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Shock Waves ◽  
Material Flow ◽  
Experimental Studies ◽  
Laser Shock ◽  
Flow Mechanism ◽  
Multiple Impacts ◽  
Fem Method ◽  
Shock Region ◽  
Adjustment Mechanisms

Laser shock micro-adjustment is a precise and noncontact adjustment technique using laser-shock-waves to adjust the curvature of micro-components. The experimental studies have indicated that: when laser shock region is located at the free end of cantilevers, multiple impacts are applied to achieve a large bending degree; meanwhile, different bending directions can be obtained with multiple impacts in the junction position. Efforts should been made to understand the mechanisms of multiple laser shock micro-adjustment. Two mechanisms have been proposed for describing the laser shock micro-adjustment in different laser shock regions, namely shock inertia mechanism and material flow mechanism. The proposed micro-adjustment mechanisms can predict bending angles and directions. To validate the proposed micro-adjustment mechanisms, numerical simulations were carried out based on the FEM method using the ANSYS/LS-DYNA software and the corresponding results demonstrate the proposed mechanisms.

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