scholarly journals Analysis of Membrane Deploying Process Based on Miura Origami

2021 ◽  
Author(s):  
Jing Zhang ◽  
Youqing Shen ◽  
Hongwei Guo ◽  
Rongqiang Liu ◽  
Ziming Kou
Keyword(s):  
Finite Element ◽  
Membrane Structure ◽  
Size Range ◽  
Membrane Surface ◽  
Stretch Ratio ◽  
The Finite Element Method ◽  
Element Simulation ◽  
Storage Volume ◽  
Two Factors ◽  
Simulation Results

Abstract Aiming at a series of characteristics of the membrane structure in the folded configuration during the deploying process, the initial defect of the membrane crease is introduced by proxy model, and to realize the study of the deploying process of the membrane. Based on the finite element method, the deploying process of the multi-element Miura membrane is simulated. And the stretch ratio, maximum mises stress, deployment rate, wrinkle deformation, etc. of membrane structure are discussed. The existence of creases can cause damage to the membrane surface, so the total length of the creases should be within an appropriate size range. By changing the number of elements and the longitudinal crease angle of the same size membrane respectively, the influence of the above two factors on the total crease length, storage volume and deploying process of the folded membrane is studied. The results show that when the longitudinal crease angle is 15°, the transverse and longitudinal displacements of the Miura folded membrane with different element numbers are not synchronized during the deploying process. By keeping the number of elements constant and increasing the angle of the longitudinal creases from 15° to 45°, the synchronization of the transverse and longitudinal displacements during the membrane deploying process is gradually enhanced. In addition, the experiment on the membrane deploying process verifies the reliability of the finite element simulation results.

scholarly journals The Effect of Layer Variation Between Liner and Cement Mantle on Reducing Cracks of PMMA Material Hip Joints

2018 ◽  
Vol 73 ◽  
pp. 12013
Author(s):  
Eko Saputra ◽  
J Jamari ◽  
Han Ay Lie ◽  
Iwan Budiwan Anwar ◽  
Rifky Ismail ◽  
...  
Keyword(s):  
Finite Element ◽  
Hip Replacement ◽  
Cement Mantle ◽  
Initial Crack ◽  
Thickness Variation ◽  
Hip Joints ◽  
Element Simulation ◽  
Two Factors ◽  
Simulation Results ◽  
Reducing Stress

Failure of cement mantle of bond loosening between liner and cement mantle is an important issue in total hip replacement. Two factors that commonly cause cement mantle failure are initial crack and stress. A solution for reducing stress on the cement mantle has been proposed by adding insertion material between liner and cement mantle. Nevertheless, further study is needed to optimize the proposed solution. A possible option is to vary the thickness of the insertion material. If the thickness of the PMMA material is constant, then the variation of the insertion thickness will be followed by the variation of the thickness of the liner. Consequently, the stress value on the liner will follow the variation of liner thickness. The objective of this study is to examine the effect of the thickness variation of the insertion material to stress on cement mantle and liner using finite element simulation. Results revealed that the magnitude of stress and deflection decreased in the cement mantle and the liner along with the increasing thickness of the insertion material.

Kinetic Modelling and Finite Element Simulation of Natural Rubber Non-Isothermal Vulcanization

2011 ◽  
Vol 306-307 ◽  
pp. 649-653
Author(s):  
Wei Guo Yao ◽  
Yu Xi Jia ◽  
Xiao Xia Wang
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Natural Rubber ◽  
Kinetic Modelling ◽  
Kinetic Equations ◽  
Processing Conditions ◽  
The Finite Element Method ◽  
Incremental Method ◽  
Element Simulation ◽  
Simulation Results

On the basis of kinetic equations constructed in the isothermal vulcanization of natural rubber (NR), a new numerical computation expression of cure degree under non-isothermal conditions is established by the incremental method. The numerical simulation of the vulcanization stage in injection molding processes of NR is performed by the finite element method, and then the time and position-dependent changes in the cure degree are analyzed numerically. The simulation results are consistent with the results described in the previous literatures. The valuable vulcanization characteristics obtained in the simulation will help engineers in the optimum design of processing conditions.

Finite Element Simulation of Crack Testing System of Electromagnetic Acoustic Emission Based on ANSYS

2012 ◽  
Vol 424-425 ◽  
pp. 1097-1101 ◽  
Author(s):  
Qing Yang Zou ◽  
Xiu Cheng Dong
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Acoustic Emission ◽  
Crack Tip ◽  
Metal Plate ◽  
Testing System ◽  
The Finite Element Method ◽  
Whole Process ◽  
Element Simulation ◽  
Simulation Results

The finite element method is adopted to simulate the whole process of electromagnetic acoustic emission in this paper. The effects of different voltage on distribution of displacement and temp at the tip of the crack are discussed. The simulation results show that, above voltage loading on the metal plate, the value of the temp around the crack tip can be up to the melting point , which will melt the tip of crack. Larger melting sizes are obtained when loading voltage is increased. At the same case, the displacement duo to electromagnetic force at crack tip is much larger than this induced by thermal expansion

scholarly journals Finite Element Analysis of the Multilayered Honeycomb Composite Material Subjected to Impact Loading

2017 ◽  
Vol 54 (1) ◽  
pp. 180-179 ◽  
Author(s):  
Raul Cormos ◽  
Horia Petrescu ◽  
Anton Hadar ◽  
Gorge Mihail Adir ◽  
Horia Gheorghiu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Composite Material ◽  
Experimental Testing ◽  
Finite Element Models ◽  
The Finite Element Method ◽  
Low Velocity ◽  
Element Analysis ◽  
Element Simulation ◽  
Different Levels

The main purpose of this paper is the study the behavior of four multilayered composite material configurations subjected to different levels of low velocity impacts, in the linear elastc domain of the materials, using experimental testing and finite element simulation. The experimental results obtained after testing, are used to validate the finite element models of the four composite multilayered honeycomb structures, which makes possible the study, using only the finite element method, of these composite materials for a give application.

Numerical Simulation of Combined Forward-Backward Extrusion

2008 ◽  
Vol 367 ◽  
pp. 193-200
Author(s):  
Branko Grizelj ◽  
M. Plancak ◽  
Branimir Barisic
Keyword(s):  
Finite Element ◽  
Close Correlation ◽  
The Finite Element Method ◽  
Forming Process ◽  
Physical Conditions ◽  
Backward Extrusion ◽  
The Past ◽  
Large Numbers ◽  
Element Simulation ◽  
Save Energy

The paper analyses the process of simulation forward-backward extrusion. In metal forming industries, many products have to be formed in large numbers and with highly accurate dimensions. To save energy and material it is necessary to understand the behavior of material and to know the intermediate shapes of the formed parts and the mutual effects between tool and formed party during the forming process. These are normally based on numerical methods which take into account all physical conditions of the deformed material during the process. For this purpose, the finite element method has been developed in the past in different ways. The paper highlights the finite element simulation as a very useful technique in studying, where there is a generally close correlation in the load results obtained with finite elements method and those obtained experimentally.

Simulation research on low frequency sound absorption of monostable metamaterials

2021 ◽  
Vol 263 (6) ◽  
pp. 648-652
Author(s):  
Tuo Xing ◽  
Xianhui Li ◽  
Xiaoling Gai ◽  
Zenong Cai ◽  
Xiwen Guan
Keyword(s):  
Magnetic Field ◽  
Finite Element ◽  
Theoretical Model ◽  
Finite Element Simulation ◽  
Sound Absorption ◽  
Magnetic Force ◽  
Low Frequency ◽  
Low Frequencies ◽  
Element Simulation ◽  
Simulation Results

The monostable acoustic metamaterial is realized by placing a flexible panel with a magnetic proof mass in a symmetric magnetic field. The theoretical model of monostable metamaterials has been proposed. The method of finite element simulation is used to verify the theoretical model. The magnetic force of the symmetrical magnetic field is simplified as the relationship between force and displacement, acting on the mass. The simulation results show that as the external magnetic force increases, the peak sound absorption shifts to low frequencies. The theoretical and finite element simulation results are in good agreement.

Research into Contact Interaction of an Elastic Tool during Rotational Pattern Cutting of Sheet Parts

2016 ◽  
Vol 685 ◽  
pp. 408-412 ◽  
Author(s):  
E.G. Gromova ◽  
A.G. Bakanova
Keyword(s):  
Finite Element ◽  
Mathematical Simulation ◽  
Elastic Medium ◽  
Design Process ◽  
Experimental Research ◽  
Simulation Method ◽  
Medium Pressure ◽  
Element Simulation ◽  
Deformation Processes ◽  
Simulation Results

The paper describes a method of pattern cutting of sheet articles using the elastic medium pressure. Research works have been conducted into feasibility of the suggested pattern cutting using finite element simulation method. The experimental research was conducted into deformation processes during rotational separating stamping of sheet articles by means of elastic medium pressure so that to confirm relevance of the mathematical simulation results. The optimum design process parameter value combinations have been determined for implementing the rotary pattern cutting process.

The Numerical Simulation of Effective Elastic Response for WC-Co Cemented Carbide

2015 ◽  
Vol 1096 ◽  
pp. 417-421
Author(s):  
Pei Luan Li ◽  
Zi Qian Huang
Keyword(s):  
Numerical Simulation ◽  
Finite Element Method ◽  
Finite Element ◽  
Theoretical Model ◽  
Material Properties ◽  
Cemented Carbide ◽  
Elastic Response ◽  
The Finite Element Method ◽  
Simulation Results ◽  
Element Method

By the use of finite element method, this paper predicts the effects of the shapes of reinforcements with different ductility (Co) on the effective elastic response for WC-Co cemented carbide. This paper conducts a comparative study on the material properties obtained through theoretical model, numerical simulation and experimental observations. Simulation results indicate that the finite element method is more sophisticated than the theoretical prediction.

Finite-element simulation of the photoacoustic–thermal signal generation

1986 ◽  
Vol 64 (9) ◽  
pp. 1030-1036 ◽  
Author(s):  
D. Lévesque ◽  
G. Rousset ◽  
L. Bertrand
Keyword(s):  
Finite Element ◽  
Adiabatic Process ◽  
The Finite Element Method ◽  
Photoacoustic Cell ◽  
Main Interest ◽  
Great Flexibility ◽  
Coupled Equations ◽  
Thermal Signal ◽  
Element Simulation ◽  
Good Agreement

The ability to use the finite-element method to solve numerically the frequency-dependent coupled equations of the photoacoustic–thermal effect is demonstrated. Both solids and fluids are simulated by the same set of equations with temperature and displacement as variables. The main interest of this formulation lies in its great flexibility to deal with mixed fluid–solid systems. As a first application, we consider the influence of thermoacoustic coupling on the pressure in a photoacoustic cell. We show that with increasing frequency, a transition from an isothermal to an adiabatic process occurs. Subsequently, results obtained from a numerical simulation of the photoacoustic cell, which includes the effect of a residual volume, are in good agreement with existing experimental data.

scholarly journals Experiment and Simulation Investigation on the Tensile Behavior of Composite Laminate with Stitching Reinforcement

2011 ◽  
Vol 2011 ◽  
pp. 1-10
Author(s):  
Yi Wang ◽  
Nai Xian Hou ◽  
Zhu Feng Yue
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Significant Influence ◽  
Composite Structures ◽  
Composite Laminate ◽  
Tensile Load ◽  
Tensile Behavior ◽  
The Finite Element Method ◽  
Tensile Process ◽  
Simulation Results

The experiments and finite element simulations of composite laminate with stitching are carried out. Firstly, the monotonous tensile experiments with and without stitching are conducted to investigate the influence of stitch reinforcement on the composite laminate. Secondly, the finite element method (FEM) is employed to simulate the tensile process of specimens, and the link element is introduced to simulate the stitching. The experiment results shows that the stitching has little influence on the damage load under monotonous tensile load, while there is a significant influence on the changing of strain. The FEM results are consistent with the experiment results, which means that the link element can be used to study the stitching of the composite laminate. The simulation results also show that the distributions of strain are changed obviously due to the existence of the stitching. Research results have a significant role on the design of the composite structures with and without stitching.

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