Simulation Study on the Frame of Pipe End Upsetting Machine and its Structure Optimization

2011 ◽  
Vol 337 ◽  
pp. 307-312
Author(s):  
Rui Jie Gu ◽  
Gang Lei ◽  
Guo Dong Shao ◽  
Ming Jie Ren ◽  
Yun Hai Jing ◽  
...  
Keyword(s):  
Stress Concentration ◽  
Simulation Study ◽  
Fe Simulation ◽  
Structure Optimization ◽  
Hydraulic Press ◽  
Simulation Software ◽  
Fe Model ◽  
Corner Radius ◽  
Torsion Deformation

The FE model of the frame of pipe end upsetting machine is built with FE simulation software ABAQUS in the study. With the FE model, the force status of the frame is studied. By which, it is found that stress concentration occurs at the inner corner of the frame and bigger corner radius can improve the stress status; the stress of main cylinder body on the up beam is high because of the action of hydraulic press; the frame is bent outward in the up-down direction and bent inward in the left-right direction when the tube is clamped tightly; the earlier deformation of the frame is improved when the tube is upset, but the torsion deformation is found in the frame; the frame is optimized and the strength and the stiffness of the optimized frame can be satisfied with the requirement of application. The results of the study are very useful to design the frame of the pipe end upsetting machine.

Study on the Pretightening Assembly Moving Beam of Open-Die Forging Hydraulic Press

2011 ◽  
Vol 399-401 ◽  
pp. 1779-1784
Author(s):  
Rui Jie Gu ◽  
He Yang ◽  
Ying Jie Zhang ◽  
Zhi Yuan Fang ◽  
Yu Lin Fan ◽  
...  
Keyword(s):  
Stress Distribution ◽  
Fe Simulation ◽  
Hydraulic Press ◽  
Simulation Software ◽  
Fe Model ◽  
Allowable Stress ◽  
Die Forging ◽  
Moving Beam ◽  
Open Die Forging ◽  
Computing Method

The FE model of the pretightening assembly moving beam of open-die forging hydraulic press is built with FE simulation software ABAQUS in the study. With the FE model, the force status of pretightening assembly moving beam is studied. Then the pretightening force of assembly moving beam is further studied and the computing method of pretightening force is given. The main achievements of the study include: Under pretightening, the stress of main moving beam is very low and that of guild sleeves is also lower than the allowable stress. Under center loading, the stress of the center field of main moving beam is higher and that of guild sleeves is almost same to that of pretightening. Under eccentric loading, the stress of same deviation field of main moving beam is higher and the effect of pretightening force on the stress of main moving beam is very small. The stress distribution of guild sleeves with different pretightening force is same and the effect of pretightening force on its strength is very low. The pretightening force of tension rod can be computed with the force of press, the allowable eccentric value of the workpiece, the distance between up guild section and down guild section of guild sleeve and the quantity of tension rods. The results of the study are very useful to design and install the pretightening assembly moving beam of open-die forging hydraulic press.

Simulation Study on the Heavy Parts of Pipe Hydrostatic Tester and their Structures Optimization

2011 ◽  
Vol 109 ◽  
pp. 296-301
Author(s):  
Rui Jie Gu ◽  
Ji Gao Liu ◽  
Jian Gong Zhang ◽  
Pei Li Li ◽  
Yong Le Kou ◽  
...  
Keyword(s):  
Axial Force ◽  
Simulation Study ◽  
Fe Simulation ◽  
Simulation Software ◽  
Small Field

The FE models of the front beam and the moving trolley of pipe hydrostatic tester are built with FE simulation software ABAQUS in the study. With the FE models, the force statuses of the two heavy parts of pipe hydrostatic tester are studied. It is found that the stress of the action field of the axial force and that of small field contacting with the pins of the front beam is higher and thicker middle cylinder can significantly improve the stress of the front beam. The stress of the middle cylinder and that of small field contacting with the pins of the moving trolley is higher. Thicker middle cylinder and optimizational ribs can significantly improve the stress of the moving trolley. The front beam and the moving trolley are optimized and the strength and the stiffness of the optimized front beam and moving trolley can be satisfied with the requirement of application. The results of the study are very useful to design the pipe hydrostatic tester.

Finite Element Analysis and Calculation of Tongue-Tearing Process of Woven Fabric

2011 ◽  
Vol 181-182 ◽  
pp. 443-448 ◽  
Author(s):  
Ping Wang ◽  
Bao Zhong Sun
Keyword(s):  
Finite Element ◽  
Fe Simulation ◽  
Test System ◽  
Simulation Software ◽  
Woven Fabric ◽  
Fe Model ◽  
Element Analysis ◽  
Weave Structure ◽  
Simulation And Experiment ◽  
Tearing Strength

Tearing is a common failure type during the service life of woven fabric. In this paper, tongue-tearing strength of a tight twill-woven fabric with weave structure of was tested on the Material Test System (MTS810.23). A Finite Element (FE) model was developed with FE simulation software ABAQUS based on the geometrical characteristics of the woven fabric. With this meso-modeling method, the whole tongue-tearing process was dynamically displayed. Tearing strength and failure morphologies were compared between FE simulation and experiment result, and good agreements were found. Also, a mesh scheme independent research was conducted for this FE model.

scholarly journals Design of Customize Interbody Fusion Cages of Ti64ELI with Gradient Porosity by Selective Laser Melting Process

Micromachines ◽  
2021 ◽  
Vol 12 (3) ◽  
pp. 307
Author(s):  
Cheng-Tang Pan ◽  
Che-Hsin Lin ◽  
Ya-Kang Huang ◽  
Jason S. C. Jang ◽  
Hsuan-Kai Lin ◽  
...  
Keyword(s):  
Stress Concentration ◽  
Selective Laser Melting ◽  
Stress Shielding ◽  
Simulation Software ◽  
Surrounding Tissue ◽  
Shielding Effect ◽  
Stress And Strain ◽  
Laser Melting ◽  
Flexion Extension ◽  
Intervertebral Cage

Intervertebral fusion surgery for spinal trauma, degeneration, and deformity correction is a major vertebral reconstruction operation. For most cages, the stiffness of the cage is high enough to cause stress concentration, leading to a stress shielding effect between the vertebral bones and the cages. The stress shielding effect affects the outcome after the reconstruction surgery, easily causing damage and leading to a higher risk of reoperation. A porous structure for the spinal fusion cage can effectively reduce the stiffness to obtain more comparative strength for the surrounding tissue. In this study, an intervertebral cage with a porous gradation structure was designed for Ti64ELI alloy powders bonded by the selective laser melting (SLM) process. The medical imaging software InVesalius and 3D surface reconstruction software Geomagic Studio 12 (Raindrop Geomagic Inc., Morrisville, NC, USA) were utilized to establish the vertebra model, and ANSYS Workbench 16 (Ansys Inc, Canonsburg, PA, USA) simulation software was used to simulate the stress and strain of the motions including vertical body-weighted compression, flexion, extension, lateral bending, and rotation. The intervertebral cage with a hollow cylinder had porosity values of 80–70–60–70–80% (from center to both top side and bottom side) and had porosity values of 60–70–80 (from outside to inside). In addition, according to the contact areas between the vertebras and cages, the shape of the cages can be custom-designed. The cages underwent fatigue tests by following ASTM F2077-17. Then, mechanical property simulations of the cages were conducted for a comparison with the commercially available cages from three companies: Zimmer (Zimmer Biomet Holdings, Inc., Warsaw, IN, USA), Ulrich (Germany), and B. Braun (Germany). The results show that the stress and strain distribution of the cages are consistent with the ones of human bone, and show a uniform stress distribution, which can reduce stress concentration.

Stress Analysis and Structure Optimization for the Opening Flat Cover of Pressure Vessels

2012 ◽  
Vol 538-541 ◽  
pp. 3253-3258 ◽  
Author(s):  
Jun Jian Xiao
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Concentration ◽  
Stress Analysis ◽  
Structure Optimization ◽  
Pressure Vessels ◽  
Secondary Stress ◽  
Element Analysis ◽  
Primary Stress ◽  
Flat Cover

According to the results of finite element analysis (FEA), when the diameter of opening of the flat cover is no more than 0.5D (d≤0.5D), there is obvious stress concentration at the edge of opening, but only existed within the region of 2d. Increasing the thickness of flat covers could not relieve the stress concentration at the edge of opening. It is recommended that reinforcing element being installed within the region of 2d should be used. When the diameter of openings is larger than 0.5D (d>0.5D), conical or round angle transitions could be employed at connecting location, with which the edge stress decreased remarkably. However, the primary stress plus the secondary stress would be valued by 3[σ].

Finite Element Study of Spinal Cord Mechanics During Biomechanical Response of Middle Cervical Spine

2010 ◽  
Author(s):  
N. Bahramshahi ◽  
H. Ghaemi ◽  
K. Behdinan
Keyword(s):  
Spinal Cord ◽  
Cervical Spine ◽  
Stress Concentration ◽  
Cervical Spinal Cord ◽  
Axial Strain ◽  
Compressive Load ◽  
Fe Model ◽  
Local Pressure ◽  
Disc Space ◽  
Flexion Extension

The present study is conducted to develop a detailed FE model of spinal cord and to study its behaviour under various loading conditions. To achieve the goal, a previously developed and validated FE model of the middle cervical spine (C3-C5) is utilized. The model is further modified to investigate the stresses that the spinal cord in experiences during cervical spine motion segment in compression and flexion/extension loading modes. The resulting Von Misses stress and axial strain of the anterior and posterior surfaces of the cervical spinal cord are obtained from a set of elements along the C4-C5 disc space of the dural sheath, CSF and cord. The results show that in compression, the anterior surface of spinal cord experiences larger displacement, stress, and strain than those of the posterior surface. Conversely, the analyses show that in flexion\extension, the stresses, strains, and displacements are more pronounced in posterior segment of the spinal cord. In extension, the posterior disc bulge applies pressure onto the Posterior Longitudinal Ligament and thereby, applying local pressure on the spinal cord. The FE results show a stress concentration at the point of contact between disc and spinal cord. Furthermore, the FE results of flexion test show similar stress concentration characteristic at the point of contact. However, the local stress on spinal cord is more pronounced in flexion than extension at the C4-C5 area of spinal cord. It was also determined the compressive load resulted in the highest stress concentration on the spinal cord.

A Study on the Grinding Temperature Field for Titanium Alloy

2007 ◽  
Vol 339 ◽  
pp. 45-49
Author(s):  
W. Li ◽  
Tong Xing ◽  
Bao Xiang Qiu ◽  
Gang Xiang Hu ◽  
Yang Fu Jin
Keyword(s):  
Finite Element ◽  
Temperature Field ◽  
Heat Source ◽  
Simulation Software ◽  
Transient Temperature ◽  
Fe Model ◽  
Grinding Temperature ◽  
Wet Grinding ◽  
Dry Grinding ◽  
Grinding Temperature Field

A reasonable finite element (FE) model of grinding temperature field has been developed on the basis of analysis of the transient temperature field， and three kinds of boundary conditions are loaded on the element of a moving heat source. The study, which is based on the finite element principle, has been carried out using the numerical simulation software ANSYS. Many results have been obtained including three dimensional temperature distribution map. The simulated results under different conditions show good agreement with the experimental results. With the comparison of the dry-grinding and wet-grinding, the result shows that the wet-grinding temperature with a proper grinding fluid is rather lower than the dry-grinding temperature. Finally, the variable coefficient of convective heat transfer and the different form heat source have been discussed in detail.

RESEARCH ON A NEW HARDNESS TESTING DEVICE BASED ON VIRTUAL DESIGN

2010 ◽  
Vol 09 (02) ◽  
pp. 161-163 ◽  
Author(s):  
QIONG CHEN ◽  
YUAN-JUN LV
Keyword(s):  
Composite Structures ◽  
Structure Optimization ◽  
Simulation Software ◽  
Digital Analysis ◽  
Testing Device ◽  
Hardness Testing ◽  
Virtual Design ◽  
Design Quality ◽  
Automation Control ◽  
Improved Design

Structure optimization of Hardness Testing Device (HTD) based on virtual design is proposed here. The purpose of the HTD is to obtain hardness properties of accessories. Since the creation of the previous HTD, a few problems have been experienced during testing. In the present work, improvements in both equipment design and automation control have been made. A realistic digital analysis is generated by combining automated and interactive approaches to evaluate the capability of the device with simulation software ADAMS and AMESim. Theoretical analysis is taken into account to obtain numerical results close to reality. The approach and the conclusions should be useful for composite structures design. The improved design of HTD reduces the number of costly physical prototypes, improves design quality and reduces product development time.

Simulation Study on Main Affect Factors to the Evacuation Corridor

2012 ◽  
Vol 170-173 ◽  
pp. 3533-3538 ◽  
Author(s):  
Yi Zhou Chen ◽  
Si Jing Cai ◽  
Yun Feng Deng
Keyword(s):  
Simulation Study ◽  
Emergency Evacuation ◽  
Simulation Software ◽  
Primary Factor ◽  
Pedestrian Evacuation ◽  
The Right ◽  
Efficiency And Reliability ◽  
Increase Efficiency

The primary goal of emergency evacuation for pedestrians is evacuating as many people as possible to safe areas in a shortest time when the accident occurred. And the primary factor of pedestrian evacuation is egress. According to the literature, we can know that the reasonable design of the evacuation corridor and the right guidance to pedestrians are very important, and analyzed main affect factors to the evacuation corridor, which affect of the evacuation speed for corridor at different pedestrian flows intensity, the width of evacuation corridor, setting canalization to corridor and the size of space of corridor peripheral. This paper use VISSIM simulation software to study on pedestrian flows evacuation. So the formulation for pedestrian evacuation program should consider a variety of elements for the design of the evacuation egress and corridors to increase efficiency and reliability for pedestrian evacuation.

MODELING OF FAILURE FEATURES FOR TiN COATINGS WITH DIFFERENT SUBSTRATE MATERIALS

2011 ◽  
Vol 03 (01n02) ◽  
pp. 49-64 ◽  
Author(s):  
S. WANG ◽  
J. LIN ◽  
D. BALINT
Keyword(s):  
Finite Element ◽  
Tool Steel ◽  
Coating Thickness ◽  
Constitutive Equations ◽  
Fe Simulation ◽  
Pure Copper ◽  
Fe Model ◽  
Tin Coating ◽  
Tin Coatings ◽  
Gear Steel

A set of continuum viscoplastic damage constitutive equations is presented in this paper. The equations are calibrated for a TiN coating material, and a number of substrate materials, and are implemented into the commercial finite element (FE) solver, ABAQUS, through the user-defined material subroutine, VUMAT, for FE simulation. An FE model has been created to simulate a load-bearing test. Studies are carried out to investigate failure features of the coating with variations in coating thickness for three different substrate materials: pure copper, a gear steel and a tool steel. It has been demonstrated that the proposed damage equations can be used to predict failure features of coatings, which are affected by the thickness of the coating and the stiffness of the substrate.

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