Numerical Simulation on Two-Step Isothermal Glass Lens Molding

2010 ◽  
Vol 126-128 ◽  
pp. 564-569 ◽  
Author(s):  
Shao Hui Yin ◽  
Ke Jun Zhu ◽  
Yu Fang Wang ◽  
Feng Jun Chen ◽  
Yu Wang
Keyword(s):  
Residual Stress ◽  
Strain Distribution ◽  
High Efficiency ◽  
Stress And Strain ◽  
Key Factors ◽  
Molding Process ◽  
Element Simulation ◽  
Glass Lens ◽  
Lens Molding ◽  
Stress And Strain Distribution

Glass lens molding is an effective approach to produce precision micro aspheric glass lens at high efficiency. In this paper, a new two-step isothermal glass molding process was proposed. The mechanisms of new molding process were analyzed. Finite element simulation was conducted to analyze the key factors such as the pressing load, die damage, molding time and residual stress of lens during the traditional molding and the two-step isothermal molding. The results showed that the two-step isothermal glass lens molding process may decrease residual stress and improve stress and strain distribution. Furthermore, prolong the service life of die.

The Vibration Characteristics Analysis of Miter Gate Based on ANSYS Workbench and Vibration Test

2013 ◽  
Vol 380-384 ◽  
pp. 64-68
Author(s):  
Xin Ze Zhao ◽  
Rui Feng Wang ◽  
Jie Wang ◽  
Mei Yun Zhao
Keyword(s):  
Finite Element ◽  
Finite Element Simulation ◽  
Strain Distribution ◽  
Vibration Test ◽  
Stress And Strain ◽  
Static Structure ◽  
Skeleton Model ◽  
Element Simulation ◽  
Stress And Strain Distribution ◽  
Ansys Workbench

The 3d model of miter gate has been set up based on skeleton model of Pro/E, and it has been imported into ANSYS Workbench module for static structure analysis and modal analysis. In the process of finite element simulation, the rotational constraints has been imposed on the top and bottom pivot according to the actual operation situation of the miter gate, and obtain the first several order frequencies and corresponding modal vibration mode of the miter gate, which can show the hydrodynamic vibration stress and strain distribution. According to the results of the finite element simulation analysis, the prototype vibration test of the miter gate has been done. The test results show that the vibration amplitude and the stress and strain distribution of each part of the miter gate are corresponding to the vibration test.

FEM Analysis of Glass Lens Molding Press

2013 ◽  
Vol 652-654 ◽  
pp. 1961-1965 ◽  
Author(s):  
Jian Zhou ◽  
Mu Jun Li ◽  
Lian Guan Shen
Keyword(s):  
Residual Stress ◽  
Volume Change ◽  
Fem Analysis ◽  
Key Factors ◽  
Spherical Lens ◽  
Whole Process ◽  
Glass Lens ◽  
Annealing Rate ◽  
Lens Molding

Glass molding press is an efficient and promising process for glass lens manufacturing. Molding temperature and velocity are crucial factors for pressing, and the annealing rate directly influences the residual stress and volume change of the final lens. The research contributes to studying the key factors that influence the quality of the molded lens. In the paper, by incorporating stress relaxation and structural relaxation of the viscoelastic material, numerical simulation is undertaken to determine the proper process parameters. Furthermore, the whole process of a spherical lens molding is simulated to predict the final residual stress and volume change, also the influence of different annealing rates is estimated.

Crystal Plasticity Finite Element Simulation of Aluminium Deformation

2020 ◽  
Vol 1001 ◽  
pp. 127-132
Author(s):  
Hong Yang Li ◽  
Song Yu ◽  
Jian Hui Li
Keyword(s):  
Finite Element ◽  
Crystal Plasticity ◽  
Strain Distribution ◽  
Plasticity Theory ◽  
Material Behavior ◽  
Stress And Strain ◽  
Crystal Plasticity Finite Element ◽  
Element Simulation ◽  
Crystal Plasticity Theory ◽  
Stress And Strain Distribution

Crystal plasticity deformation of aluminium plays an important role on the investigation of macro deformation. In this paper, to discuss the effect ot crystal plasticity on the aluminium material behavior, crystal plasticity theory and macro finite element was combined together. The basic theory of crystal plasticity and finite element was introduce and the simulation result of aluminium was given. The stress and strain distribution was discussed and the efficient of the method was shown. It is shown that the orientation of the material and other micro character of the materials all influence the plasticity behavior of the material greatly.

Effect of annealing on the residual stress and strain distribution in CdZnTe wafers

2007 ◽  
Vol 305 (1) ◽  
pp. 50-54 ◽  
Author(s):  
Dongmei Zeng ◽  
Wanqi Jie ◽  
Gangqiang Zha ◽  
Tao Wang ◽  
Ge Yang
Keyword(s):  
Residual Stress ◽  
Strain Distribution ◽  
Stress And Strain ◽  
Stress And Strain Distribution

scholarly journals Experimental and Numerical Study of NACA and Conventional Riveting Procedure

2017 ◽  
Vol 2017 (9) ◽  
pp. 157-170 ◽  
Author(s):  
Wojciech Wronicz ◽  
Jerzy Kaniowski ◽  
Maciej Malicki ◽  
Paweł Kucio ◽  
Robert Klewicki
Keyword(s):  
Residual Stress ◽  
Strain Distribution ◽  
Numerical Study ◽  
Fatigue Behaviour ◽  
Fatigue Properties ◽  
Stress And Strain ◽  
Hole Expansion ◽  
Strain Gauge Measurements ◽  
Stress And Strain Distribution ◽  
Numerical Approaches

AbstractFatigue behaviour is one of the most important properties of modern airplanes and rivets influence it strongly. According to the literature, the NACA riveting offers a multiple increase in the fatigue life of joints.The aim of this paper is to investigate the benefits offered by the NACA riveting procedure with respect to the residual stress and strain distribution after riveting as well as rivet hole expansion. Experimental and numerical approaches were adopted. The conventional riveting with both the universal and countersunk rivets was compared with the NACA riveting. The countersunk angle and depth in the case of the NACA riveting was modified somewhat relative to the values met in the literature. For these three cases, strain gauge measurements during riveting, hole expansion measurements and FE calculations were performed. The hole expansion measurement with the use of Computer Tomography(CT) was proposed.Only the FE calculations unambiguously indicate better fatigue properties of the NACA riveting. The proposed method of hole expansion measurement requires further research to increase its accuracy.

The Finite Element Simulation Analysis of Tapered Bearing Retainer and Optimized Selection of Mould Parameters

2012 ◽  
Vol 490-495 ◽  
pp. 2858-2863
Author(s):  
Yong Wu Jiang ◽  
Yang Chen ◽  
Jin Dong Liu
Keyword(s):  
Finite Element ◽  
Finite Element Simulation ◽  
Strain Distribution ◽  
Simulation Analysis ◽  
Stress And Strain ◽  
Stamping Process ◽  
Element Simulation ◽  
Distribution Laws ◽  
Stress And Strain Distribution ◽  
Selection Of

This article mainly studies about the stamping processing of the tapered bearing retainer which mainly presents the finite element simulation of the tapered bearing retainer stamping process using Deform software. The author put forwards that how to analyze the stress and strain distribution laws, the shear stress, the stamping force and their influence law, also analyzes the influence the main parameter has on the stamping process and make the optimized selection.

Effect of pipe expansion on the redistribution of residual stresses after molding

2020 ◽  
Vol 10 (2) ◽  
pp. 122-126
Author(s):  
Nikolay A. Makhutov ◽  
◽  
Dmitry A. Neganov ◽  
Eugeny P. Studenov ◽  
◽  
...  
Keyword(s):  
Residual Stresses ◽  
Strain Distribution ◽  
Strain State ◽  
Stress And Strain ◽  
Cylindrical Shape ◽  
Pipe Material ◽  
Pipe Expansion ◽  
Calculation Results ◽  
Residual Deformations ◽  
Stress And Strain Distribution

In the factory, pipes for trunk oil and oil product pipelines are obtained by molding and welding. To ensure a cylindrical shape and reduce technological residual stresses, expansion technology is used. Pipe expansion causes a significant change in the values of residual deformations and stresses. The article presents both the calculation results and graphs regarding stress and strain distribution during bending of the stock and their redistribution after expansion. Based on the calculation results, the final total values of residual stresses and residual deformations caused by bending and expansion were stated to be important components of the stress-strain state observed in pipelines being operated under cyclic loading, as well as those used in assessing how degradation affects the ductility of the pipe material. These factors were concluded as being reasonably taken into account when performing verification calculations regarding long-running pipelines if, based on their diagnostics and analysis, their state does not meet modern strength requirements.

Study on Stress and Strain of Anchorage Using Finite Element Method

2013 ◽  
Vol 325-326 ◽  
pp. 1314-1317
Author(s):  
Cong Sheng Chen ◽  
Ping He ◽  
Cheng Yong Wang ◽  
Xue Hui Chen ◽  
Lei Huang ◽  
...  
Keyword(s):  
Finite Element ◽  
Strain Distribution ◽  
Maximum Stress ◽  
Mechanical Response ◽  
Three Dimensional ◽  
Integrated Modeling ◽  
Stress And Strain ◽  
Steel Strand ◽  
Prestressed State ◽  
Stress And Strain Distribution

Three-dimensional integrated modeling method and the numerical simulation of elastoplastic finite element are adopted in the paper. The mechanical response of the five holes anchorage is analyzed in certain prestressed state. The stress and strain distribution information of the anchor ring, clip and steel strand is obtained respectively, and the structure safety is discussed by investigating on the maximum stress and strain.

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