A non-isothermal finite element model for injection stretch-blow molding of PET bottles with parametric studies

2004 ◽  
Vol 44 (7) ◽  
pp. 1379-1390 ◽  
Author(s):  
Z. J. Yang ◽  
E. Harkin-Jones ◽  
G. H. Menary ◽  
C. G. Armstrong
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Pet Bottles ◽  
Blow Molding ◽  
Parametric Studies ◽  
Stretch Blow Molding

Wear Modeling of Nanometer Thick Protective Coatings

2016 ◽  
Vol 139 (2) ◽  
Author(s):  
Jungkyu Lee ◽  
Youfeng Zhang ◽  
Robert M. Crone ◽  
Narayanan Ramakrishnan ◽  
Andreas A. Polycarpou
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Protective Coatings ◽  
Element Model ◽  
Disk Surface ◽  
Magnetic Storage ◽  
Theoretical Frameworks ◽  
Storage Devices ◽  
Parametric Studies ◽  
Magnetic Storage Devices

Use of nanometer thin films has received significant attention in recent years because of their advantages in controlling friction and wear. There have been significant advances in applications such as magnetic storage devices, and there is a need to explore new materials and develop experimental and theoretical frameworks to better understand nanometer thick coating systems, especially wear characteristics. In this work, a finite element model is developed to simulate the sliding wear between the protruded pole tip in a recording head (modeled as submicrometer radius cylinder) and a rigid asperity on the disk surface. Wear is defined as plastically deformed asperity and material yielding. Parametric studies reveal the effect of the cylindrical asperity geometry, material properties, and contact severity on wear. An Archard-type wear model is proposed, where the wear coefficients are directly obtained through curve fitting of the finite element model, without the use of an empirical coefficient. Limitations of such a model are also discussed.

Modeling and experimental analysis of the hyperelastic thin film nitinol

2011 ◽  
Vol 22 (17) ◽  
pp. 2045-2051 ◽  
Author(s):  
Youngjae Chun ◽  
Po-Yu Lin ◽  
Hsin-Yun Chang ◽  
Michael C. Emmons ◽  
K.P. Mohanchandra ◽  
...  
Keyword(s):  
Thin Film ◽  
Finite Element ◽  
Finite Element Model ◽  
Large Deformation ◽  
Experimental Analysis ◽  
Electronic Devices ◽  
Element Model ◽  
Elastic Response ◽  
Geometric Factors ◽  
Parametric Studies

Many flexible electronic devices or endovascular biomedical devices require large deformation; however, potential materials produce limited elastic response, that is, 10% when 400% is required. In this article, a finite element model is used to design a hyperelastic thin film nitinol structure containing geometric fenestrations. The hyperelastic response is dependent upon geometric factors that produce buckling. Parametric studies provide the influence-specific parameters have on buckling load. These results are used to select three designs to manufacture and test. Experimental results indicate that elongations greater than 700% are possible.

Nonlinear Finite Element Analysis of FRP Strengthened RC Beams with Bond-Slip Effect

2017 ◽  
Vol 14 (03) ◽  
pp. 1750032 ◽  
Author(s):  
Prabin Pathak ◽  
Y. X. Zhang ◽  
Xiaodan Teng
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Structural Behavior ◽  
Slip Effect ◽  
Rc Beams ◽  
Element Analysis ◽  
Bond Slip ◽  
Research Findings ◽  
Parametric Studies

This paper investigates the structural behavior of fiber reinforced polymer (FRP) strengthened reinforced concrete (RC) beams by developing a new simple, efficient and accurate finite element model (FEM-B). In addition to the FRP, concrete and steel rebars, the adhesive and stirrups which have been generally ignored in the reported models from literatures are considered in the new models. At first, a finite element model (FEM-P) is developed assuming perfect bond between concrete, FRP and adhesive interfaces. Then the FEM-P model is expanded to form the FEM-B model by including the bond-slip effect between concrete, FRP and adhesive interfaces. The developed new finite element models (FEM-B and FEM-P) are validated against experimental results and demonstrate to be effective for the structural analysis of FRP strengthened RC beams. Furthermore, parametric studies are carried out to learn the effects of types and thickness of FRP on the structural behavior of FRP strengthened RC beams based on the FEM-B model. The research findings are summarized finally.

Rotordynamic Analysis of a Power Turbine Including Support Flexibility Effects

2008 ◽  
Author(s):  
Oscar De Santiago ◽  
Edward Abraham
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Oil And Gas ◽  
Transfer Functions ◽  
Element Model ◽  
Process Equipment ◽  
Gas Generator ◽  
Power Turbine ◽  
Parametric Studies ◽  
Function Information

Power turbines are commonly used in the oil and gas industries as mechanical drives of process equipment such as centrifugal compressors or electrical generators. Power turbine rotordynamic design analysis is important because there may be interaction between the rotor and the structure, including the baseplate where they are mounted. This paper presents the results of the dynamic analysis of a power turbine considering the turbine frame, gas generator and baseplate. A large finite element model (FEM) of the assembly is used to generate transfer functions representing the dynamics of these components acting at the rotor bearing locations. The transfer function information is then used in a dedicated rotordynamic program to perform parametric studies and provide recommendations for the optimum power turbine bearing and baseplate configurations that meet all applicable industrial specifications. Predictions from a complete rotor-structure finite element model confirm the results from the dedicated rotordynamic program using transfer functions, showing that this simplified model can be used to satisfactorily study the system dynamics.

Improvement of Damping at the Micromechanical Level in Polymer Composite Materials Under Transverse Normal Loading by the Use of Special Fiber Coatings

1998 ◽  
Vol 120 (2) ◽  
pp. 623-627 ◽  
Author(s):  
I. C. Finegan ◽  
R. F. Gibson
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Plane Strain ◽  
Composite Structure ◽  
Element Model ◽  
Acrylic Polymer ◽  
Normal Loading ◽  
Fiber Coating ◽  
Parametric Studies ◽  
Fiber Coatings

This paper describes preliminary results from a systematic analytical study of the improvement of damping in polymer composites at the micromechanical level under transverse normal loading by the use of special fiber coatings. Since shear deformations are important in damping of viscoelastic polymers, and large shear strains are generated in the region of the fiber/matrix interface, one idea for improving damping is to put a fiber coating made from a highly dissipative material in this region. A finite element model based on a “representative volume element” or repeating element of a continuously reinforced coated fiber composite is used to study damping under transverse normal loading. The micromechanical composite model investigated is a unidirectional graphite/epoxy with an acrylic polymer as the fiber coating material. Both two and three dimensional finite element models are analyzed in order to compare the influence of plane stress and plane strain conditions on the damping and stiffness properties of the composite micromechanical model. Parametric studies are conducted by using a two dimensional plane strain finite element model in order to illustrate how the coating applied to the fiber influences dynamic properties of the composite structure. The parametric studies are done with particular emphasis on the effects of frequency, temperature, and fiber coating thickness on the damping of the composite structure.

Parametric Studies on Effect of Trailing Liquid Nitrogen Heat Sink on TIG Welding of Steels

2014 ◽  
Vol 875-877 ◽  
pp. 1595-1599 ◽  
Author(s):  
R.S. Sudheesh ◽  
N. Siva Prasad
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Liquid Nitrogen ◽  
Heat Sink ◽  
Element Model ◽  
Cooling Agent ◽  
Out Of Plane ◽  
Parametric Studies ◽  
Constant Distance ◽  
Uniform Expansion

Welding is an efficient material joining process. But the localised temperature rise up to the melting point in the vicinity of arc causes non uniform expansion and contraction resulting in residual stress and distortions. Post weld, Pre weld and in-process methods have been studied to reduce these unwanted effects of welding. A trailing heat sink is one such method. This consists of a cooling agent traversing at a constant distance behind the weld arc. Introduction of a cooling agent is reported to reduce the distortion. A liquid nitrogen jet is used as the cooling agent in the present study. A finite element model developed using Sysweld is used to study the effect of liquid nitrogen heat sink on weld distortions and residual stresses. The finite element model developed is used to make a parametric study on the effect of cooling jet radius, cooling strength and the distance between the jet and weld arc on out of plane distortions and stresses. Comparative study of the effect of cooling jet is made for mild steel (MS) and stainless steel (SS). It is observed that the out of plane distortions reduce with increasing cooling strength, jet radius. Reduction in distance between the jet and weld arc also causes a reduction in distortions.

FEM-Based Research on Molding Parameter Analysis of the PET Beverage Bottle

2014 ◽  
Vol 488-489 ◽  
pp. 121-124
Author(s):  
Lu Yong Sun ◽  
Jin Long Zou ◽  
Kai Chen
Keyword(s):  
Thickness Distribution ◽  
Element Model ◽  
Parameter Analysis ◽  
Technological Parameters ◽  
Molding Process ◽  
Pet Bottles ◽  
Blow Molding ◽  
Molding Parameter ◽  
Stretch Blow Molding ◽  
Different Thickness

The researched PET beverage bottle molding process was analyzed with the combination of stretch blow molding technological process of the manufacturing enterprise. The molding results would be influenced by some technological parameters. In order to study the effect of these factors on the forming properties and thickness distribution of molding bottle, the article builds the physical model and finite element model of PET bottles stretch blow molding process, and simulates stretch blow molding process by using POLYFLOW software for analyzing the thickness distribution of molding bottle. Comparing different thickness distribution under the different condition of stretch speed, pre-blowing pressure, and blowing pressure, the technological parameters were optimized, so as to achieve the goal of optimization of molding bottle.

Vehicle-Track Dynamic Simulations of a Locomotive Considering Wheelset Structural Flexibility and Comparison with Measurements

2005 ◽  
Vol 219 (4) ◽  
pp. 225-238 ◽  
Author(s):  
N Chaar ◽  
M Berg
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Elastic Deformation ◽  
Element Model ◽  
Dynamic Interaction ◽  
Structural Flexibility ◽  
Frequency Range ◽  
Dynamic Simulations ◽  
Present Context ◽  
Parametric Studies

Wheelset structural flexibility, that is the elastic deformation of the wheelset as a structure, can significantly influence the vehicle-track dynamic interaction. In this paper on-track simulations considering flexible wheelsets, modelled through eigenmodes derived from a finite element model, are presented and compared with on-track measurements. The effects of the wheelset structural flexibility on track forces, in the frequency range 0-100 Hz, are investigated. Results from parametric studies are also presented. The present application is a Swedish Rc7 locomotive having rather slender wheelsets. It is shown that both lateral and vertical track forces are significantly influenced by the wheelset flexibility and that the agreement with measurements is fairly good. The wheelset flexibility increases the lateral track forces. The track representation in the present context is important and the used so-called moving track model needs improvements.

scholarly journals Element Modeling of Masonry Wall With Opening Under Lateral Force

2018 ◽  
Vol 1 (2) ◽  
pp. 71
Author(s):  
Danna Darmayadi ◽  
Muhamad Rusli Ahyar
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Three Dimensional ◽  
Element Model ◽  
Lateral Force ◽  
Masonry Wall ◽  
Model Verification ◽  
Dimensional Finite Element ◽  
Parametric Studies ◽  
Three Dimensional Finite Element

Abstract: Three-dimensional Finite Element Model for Masonry Wall with openings under lateral force using ABAQUS software. Finite element model verification with an experiment masonry wall in the laboratory without openings. The load-displacement relationship of finite element model is well agreed with experimental results. Parametric studies conducted on masonry wall with openings to investigate the influence of an area of openings. This research aimed to investigate the behavior of Masonry Walls with openings under lateral force. The result showed that the increase of the area of openings decreases stiffness and strength of masonry. It is also well observed from the result that lateral resistance of masonry will decrease for each area of the opening wall.

Reliability Prediction for 95.5Sn3.9Ag0.6Cu Solder Bump and Thermal Design for Lead Free System in Package with Polymer-Based Material

2006 ◽  
Vol 505-507 ◽  
pp. 289-294 ◽  
Author(s):  
Hsiang Chen Hsu ◽  
Wei Mao Hung
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Flip Chip ◽  
Element Model ◽  
Thermal Design ◽  
Creep Model ◽  
Free System ◽  
Package Design ◽  
Parametric Studies ◽  
Solder Fatigue

This paper demonstrates the thermal-induced mechanical problems resulted from various temperature profiles of reliability test for a system-in-package (SIP) assembly process. The package includes two flip chip mounted chips (underfilled), two memory CSPs, some passive SMDs and 4-layer BT substrate. The flip-chip specimen was taken and the Moiré Interferometry was used as methodology to verify the developed Finite Element Model and material property. It also shows that the developed finite element model is capable to simulate the JEDEC standard JESD22-A104 reliability thermal cycle test and then to predict solder fatigue life and to summarize design rules for thermal optimization of package based on the creep model and viscoplastic model of solder while the SIP package design is proceeded. Thermal design for SIP depends on the placement of FC chip (high power) and memory CSP components. Passive SMDs are also included to study the effect of thermal-induced stress. A series of comprehensive parametric studies were conducted in this paper.

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