scholarly journals Finite Element Analysis on Ultrasonic Drawing Process of Fine Titanium Wire

Metals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 575
Author(s):  
Shen Liu ◽  
Xiaobiao Shan ◽  
Hengqiang Cao ◽  
Tao Xie
Keyword(s):  
Finite Element ◽  
Kinematic Hardening ◽  
New Technology ◽  
Friction Stress ◽  
Element Model ◽  
Underlying Mechanism ◽  
Drawing Process ◽  
Drawing Force ◽  
Element Analysis ◽  
Half Wavelength

Ultrasonic drawing is a new technology to reduce the cross-section of a metallic tube, wire or rod by pulling through vibrating dies. The addition of ultrasound is beneficial for reducing the drawing force and enhancing the surface finish of the drawn wire, but the underlying mechanism has not been fully understood. In this paper, an axisymmetric finite element model of the single-pass ultrasonic drawing was established in commercial FEM software based on actual wire length. The multi-linear kinematic hardening (MKINH) model was used to define the elastic and plastic characteristics of titanium. Influences of ultrasonic vibration on the drawing process were investigated in terms of four factors: location of the die, ultrasonic amplitude, drawing velocity, and friction coefficient within the wire-die contact zone. Mises stresses, as well as contact and friction stress, in conventional and ultrasonic drawing conditions, were compared. The results show that larger ultrasonic amplitude and lower drawing velocity contribute to greater drawing force reduction, which agrees with former research. However, their effectiveness is further influenced by the location of the die. When ultrasonic amplitude and drawing speed remain unchanged, the drawing force is minimized when the die locates at the half-wavelength position, while maximized at the quarter-wavelength position.

scholarly journals Finite element analysis of soft foundation treatment by thermal drainage consolidation of group well

2020 ◽  
Vol 198 ◽  
pp. 03025
Author(s):  
Kang Le ◽  
Zhang tingjun ◽  
Tong Junhui ◽  
Chen Di ◽  
Qian Baoyuan
Keyword(s):  
Finite Element ◽  
Model Test ◽  
New Technology ◽  
Element Model ◽  
Element Analysis ◽  
Mechanical Field ◽  
Foundation Treatment ◽  
Soft Foundation ◽  
Consolidation Effect ◽  
The Finite Element Model

Thermal drainage consolidation method is a new technology of soft foundation treatment, which involves the coupling of thermo-hydro-mechanical field, and the action mechanism is complex. In this paper, taking the model test of thermal drainage consolidation as the prototype, the finite element model of thermal drainage consolidation is established by using Abaqus software, then, the numerical results are obtained and are compared with the results of model test, and the reliability of the numerical model is verified. The results show that when the applied load is constant, the higher the temperature is, the faster the consolidation speed of soil is, but with the increase of temperature, the consolidation effect of the same temperature difference will gradually weaken. In addition, the thermal drainage consolidation method can achieve the best treatment effect when the temperature of the soil reaches 60 ℃.

Computer Simulation of Deep Drawing Process for a Laminated Composite Cup

2007 ◽  
Author(s):  
Tushar Naik ◽  
Zhong Hu
Keyword(s):  
Finite Element ◽  
Aluminum Alloy ◽  
Deep Drawing ◽  
Laminated Composites ◽  
Laminated Composite ◽  
Element Model ◽  
Drawing Process ◽  
Forming Process ◽  
Element Analysis ◽  
Deep Drawing Process

The anisotropic nature of laminated composites creates a unique opportunity and also a great challenge for tailoring their behavior during the forming processes according to the design requirements. In this work, design and simulation of a deep drawing process for fiber-reinforced laminated composites were conducted by using finite element analysis. The effects of the fiber orientation and stacking order on the deep drawing process were investigated based on the basic understanding of forming process of the isotropic aluminum alloy (Al-1100) and laminated composite material (Grilon RVZ-15H nylon/glass). A three dimensional finite element model incorporating layered structural laminates with various fiber orientations was developed. The load-stroke relationship, changes in thickness, and stress-strain distribution were investigated and compared for both aluminum alloy and laminated composites of [0]12, [0/90]6 and [0/90/45/135]3, which can be employed for detailed design and process optimization.

Deformation Mechanism Analysis of Hydro-Drawing Parabola Workpieces Based on DYNAFORM

2011 ◽  
Vol 675-677 ◽  
pp. 887-890
Author(s):  
Wei Hua Kuang
Keyword(s):  
Finite Element ◽  
Three Dimensional ◽  
Element Model ◽  
Stress And Strain ◽  
Mechanism Analysis ◽  
Drawing Process ◽  
Element Analysis ◽  
Changing Trends ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

A three-dimensional finite element model of hydro-drawing parabola workpieces was built in this study. By finite element analysis, the deformation was obtained. Based on simulation, the changing trends of stress and strain were obtained. In addition, thinning and FLD were studied. These results might provide useful reference on design improvement of the hydro-drawing process.

Study of Stress Distribution for Ceramic Materials in Human Denture by 3D Finite Element Model

2014 ◽  
Vol 1044-1045 ◽  
pp. 100-103
Author(s):  
Zhi Hong Dong ◽  
Chang Chun Zhou
Keyword(s):  
Finite Element ◽  
Stress Distribution ◽  
New Technology ◽  
Three Dimensional ◽  
Element Model ◽  
Ceramic Materials ◽  
3D Design ◽  
Element Analysis ◽  
Optical Scanner ◽  
Cad Cam

Teeth is the most hard tissue in human body, and its component contains over 96 wt.% inorganic mineral. When the teeth were destroyed by chewing, whiten, etched and friction, etc., ceramic materials are one of the most widely used materials for dental defect repairing or replacement [1-3]. Stress distribution of teeth is necessary to evaluate due to bearing the heavier load, especially the mandibular first molar. But its structure is so complex as not to measure the stress distribution accurately. With the development of CAD/CAM technology, some new technology and equipments occurrence may supply for good methods to evaluate the characteristics of complex structures [4-7]. Since Farah introduced a finite element analysis method into the field of oral medicine in 1973, the method was widely used to research the teeth mechanics, which is most suitable and efficient tools compared with other technologies [8]. In this paper, molar stress distributions were analyzed. By three-dimensional optical scanner and computer 3D design software such as solidworks, Geomagic Studio, CATIA V5, a molar model was built with accuracy and effectiveness, further the mechanical properties of ceramics denture was achieved.

Finite Element Analysis of Rolling Contact for Nonlinear Kinematic Hardening Bearing Steel

1995 ◽  
Vol 117 (4) ◽  
pp. 729-736 ◽  
Author(s):  
M. Howell ◽  
G. T. Hahn ◽  
C. A. Rubin ◽  
D. L. McDowell
Keyword(s):  
Finite Element ◽  
Kinematic Hardening ◽  
Element Model ◽  
Bearing Steel ◽  
Rolling Contact ◽  
Image Point ◽  
Element Analysis ◽  
Transient Region ◽  
Pure Rolling ◽  
Constitutive Properties

A Mroz image point, two surface, nonlinear-kinematic-hardening-plastic (MNKP) representation of bearing steel is inserted into a finite element model of 2-dimensional, line contact for pure rolling. The calculations are compared with previous results for the same contact pressure derived for elastic-linear-kinematic-hardening-plastic (ELKP) behavior. The residual stress, deformation, and the connection between continuing cyclic deformation, etching bands, and cracks are analyzed. Unlike the ELKP constitutive properties, the MNKP behavior displays a distinct transient region which results in higher residual stresses.

scholarly journals Finite Element Investigation of Moment Effect on Fretting Fatigue

2021 ◽  
Vol 04 (04) ◽  
Author(s):  
Behnam Hajshirmohammadi ◽  
Keyword(s):  
Finite Element ◽  
Bending Moment ◽  
Friction Stress ◽  
Element Model ◽  
Fretting Fatigue ◽  
Major Effect ◽  
Damage Effect ◽  
Element Analysis ◽  
Pure Moment ◽  
Moment Effect

Fretting fatigue is a degrading process which is responsible for considerable amount of mechanical structure failure every year. In the present study, a finite element model is proposed to show the effect of a bending moment on a flat surface under fretting loading. The results show that the bending moment has a major effect on the friction stress distribution on the surface of the two solids under contact. Finite element analysis predicts an increased damage effect on the surface of solids when a load is applied as a pure moment. The results predict elevation in the relative slip between the surfaces after applying the bending moment.

Elastoplastic Finite Element Analysis of Three-Dimensional, Pure Rolling Contact at the Shakedown Limit

1990 ◽  
Vol 57 (1) ◽  
pp. 57-65 ◽  
Author(s):  
S. M. Kulkarni ◽  
G. T. Hahn ◽  
C. A. Rubin ◽  
V. Bhargava
Keyword(s):  
Finite Element ◽  
Half Space ◽  
Kinematic Hardening ◽  
Three Dimensional ◽  
Element Model ◽  
Rolling Contact ◽  
Stress Strain ◽  
Element Analysis ◽  
Perfectly Plastic ◽  
Shakedown Limit

This paper describes a three-dimensional elastoplastic finite element model of repeated, frictionless rolling contact. The model treats a sphere rolling on an elastic-perfectly plastic and an elastic-linear-kinematic-hardening plastic, semi-infinite half space. The calculations are for a relative peak pressure (po/k) = 4.68 (the theoretical shakedown limit for perfect plasticity). Three-dimensional rolling contact is simulated by repeatedly translating a hemispherical (Hertzian) pressure distribution across an elastoplastic semi-infinite half space. The semi-infinite half space is represented by a finite mesh with elastic boundaries. The calculations describe the distortion of the rim, the residual stress-strain distributions, stress-strain histories, and the cyclic plastic strain ranges in the vicinity of the contact.

Improved Finite Element Model to Predict the Reverse Loading Behavior of Autofrettaged A723 and HB7 Cylinders

2012 ◽  
Vol 134 (4) ◽  
Author(s):  
E. Troiano ◽  
J. H. Underwood ◽  
A. M. Venter ◽  
J. H. Izzo ◽  
J. M. Norray
Keyword(s):  
Finite Element ◽  
Bauschinger Effect ◽  
Kinematic Hardening ◽  
Element Model ◽  
Significant Error ◽  
Strain Hardening Exponent ◽  
Element Analysis ◽  
Strong Function ◽  
Reverse Loading ◽  
Loss Of Strength

Ideal isotropic or kinematic hardening is often utilized in order to simplify the modeling of the loading and reverse loading behavior of materials when using finite element analysis. Unfortunately, this simplification can result in significant error if the material exhibits the Bauschinger effect (BE), which is the loss of strength of the material upon reverse loading. The error associated with this simplification is further compounded in heavily autofrettaged, Cr-Mo-V, thick walled cylinders due to the fact that the Bauschinger effect and the reverse loading strain hardening exponent are a strong function of the initial applied plastic strains, which can vary significantly throughout the wall of the cylinder.

Evaluation of Drawing Force and Thickness Distribution in the Deep-Drawing Process with Variable Blank-Holding

2015 ◽  
Vol 639 ◽  
pp. 33-40 ◽  
Author(s):  
Lucian Lazarescu ◽  
Ioan Nicodim ◽  
Dorel Banabic
Keyword(s):  
Finite Element ◽  
Deep Drawing ◽  
Thickness Distribution ◽  
Element Model ◽  
Alloy Sheet ◽  
Wall Thickening ◽  
Drawing Process ◽  
Drawing Force ◽  
Deep Drawing Process ◽  
Blank Holding Force

In the deep drawing process, the blank-holding force (BHF) is an important process parameter affecting the energy consumption and the successful production of parts. In the present work, both experiments and finite element simulations have been conducted to investigate the influence of constant and time variable BHF on drawing force (DF) and thickness distribution in the deep drawing process of cylindrical and square cups. A finite element model was developed in the AutoForm software and validated with experiments. The developed model has been used for the simulation of deep drawing process of AA6016-T4 aluminum alloy sheet. The experimental and numerical results show that, using a variable instead of a constant BHF, the DF can be decreased in the expense of wall thickening.

КОНСТРУКТИВНО-ТЕХНОЛОГІЧНІ ОСОБЛИВОСТІ ХВОСТО-ВИХ БАЛОК СІТЧАСТОГО ТИПУ З ПОЛІМЕРНИХ КОМПО-ЗИЦІЙНИХ МАТЕРІАЛІВ ВЕРТОЛЬОТІВ ТРАНСПОРТНОЇ КАТЕГОРІЇ

2020 ◽  
pp. 15-30
Author(s):  
А. Г. Гребеников ◽  
И. В. Малков ◽  
В. А. Урбанович ◽  
Н. И. Москаленко ◽  
Д. С. Колодийчик
Keyword(s):  
Finite Element ◽  
Strain State ◽  
Layer Structure ◽  
Metal Structure ◽  
Element Model ◽  
Stress Strain ◽  
Element Analysis ◽  
Mesh Structure ◽  
Stress Strain State ◽  
Mesh Structures

The analysis of the design and technological features of the tail boom (ТB) of a helicopter made of polymer composite materials (PCM) is carried out.Three structural and technological concepts are distinguished - semi-monocoque (reinforced metal structure), monocoque (three-layer structure) and mesh-type structure. The high weight and economic efficiency of mesh structures is shown, which allows them to be used in aerospace engineering. The physicomechanical characteristics of the network structures are estimated and their uniqueness is shown. The use of mesh structures can reduce the weight of the product by a factor of two or more.The stress-strain state (SSS) of the proposed tail boom design is determined. The analysis of methods for calculating the characteristics of the total SSS of conical mesh shells is carried out. The design of the tail boom is presented, the design diagram of the tail boom of the transport category rotorcraft is developed. A finite element model was created using the Siemens NX 7.5 system. The calculation of the stress-strain state (SSS) of the HC of the helicopter was carried out on the basis of the developed structural scheme using the Advanced Simulation module of the Siemens NX 7.5 system. The main zones of probable fatigue failure of tail booms are determined. Finite Element Analysis (FEA) provides a theoretical basis for design decisions.Shown is the effect of the type of technological process selected for the production of the tail boom on the strength of the HB structure. The stability of the characteristics of the PCM tail boom largely depends on the extent to which its design is suitable for the use of mechanized and automated production processes.A method for the manufacture of a helicopter tail boom from PCM by the automated winding method is proposed. A variant of computer modeling of the tail boom of a mesh structure made of PCM is shown.The automated winding technology can be recommended for implementation in the design of the composite tail boom of the Mi-2 and Mi-8 helicopters.

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