Numerical Simulation of Stress-Strain of AZ31 Mg Alloy Profile during Warm Tension-Rotation Bending Process

2013 ◽  
Vol 690-693 ◽  
pp. 2379-2382
Author(s):  
Han Xiao ◽  
Long Biao Wu
Keyword(s):  
Numerical Simulation ◽  
Plastic Strain ◽  
Tangential Stress ◽  
Cross Section ◽  
Equivalent Plastic Strain ◽  
Mg Alloy ◽  
Stress Strain ◽  
Az31 Mg Alloy ◽  
Bending Process ◽  
Distribution Of Stress

The warm tension-rotation bending process of AZ31 Mg alloy profile was simulated. The distribution of stress and equivalent plastic strain of the profile during the bending process were analyzed. The results indicate that tangential stress of cross-section of profile from the inside to outside after bending is shown as "tensile-compression-tensile-compression", which is appeared as "N"-shaped. Equivalent plastic strain of the outside of profile is maximum, which is 0.132; the inside of profile is lower, which is 0.069; the middle of profile is minimum, which is 0.003.

Numerical Simulation of Bending Angle on Geometric Accuracy of AZ31 Mg Alloy Profile during Warm Bending Process

2012 ◽  
Vol 482-484 ◽  
pp. 314-317
Author(s):  
Han Xiao ◽  
Yu Chun Dang ◽  
Shi Hong Zhang ◽  
De Hong Lu
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Finite Element Model ◽  
Cross Section ◽  
Element Model ◽  
Mg Alloy ◽  
Geometric Accuracy ◽  
Bending Angle ◽  
Az31 Mg Alloy ◽  
Bending Process

A 3D elastic-plastic thermo-mechanical coupled finite element model of AZ31 Mg alloy profile during warm bending process was established. The effect of bending angle on the geometric accuracy of the profile was investigated. The results indicate that with increasing bending angle, the springback angles increase from 7.56° to 8.27°; the bending radii decrease from 90.15 mm to 90.01 mm; the cross-section distortion of the bent profile increases.

Research to the Influence of Bolt Direction on the Surrounding Rock

2013 ◽  
Vol 353-356 ◽  
pp. 1749-1752
Author(s):  
Yu Cheng Zhao ◽  
Dan Feng Lu ◽  
Yao Chen
Keyword(s):  
Numerical Simulation ◽  
Plastic Strain ◽  
Plastic Zone ◽  
Equivalent Plastic Strain ◽  
Surrounding Rock ◽  
Ansys Software ◽  
Stress Strain ◽  
Roadway Safety ◽  
Reasonable Range ◽  
Bolt Support

Bolt design has an important role to give full play to the effect of bolt support and ensure the roadway safety. Based on numerical simulation by ANSYS software, stress - strain is no longer as the analysis object in the study, but creating the paths mapped equivalent plastic strain to observe the changes in the plastic zone. This paper studies the influence of bolt direction on the surrounding rock, and proposes a reasonable range of support direction to provide a reference for the actual bolt. The result has shown that the large oblique bolt results in the equivalent plastic strain increasing and it is not conducive to control the deformation of the surrounding rock. The best supporting direction is from-30 ° to 30 °.

Influence of Elastic-Plastic Bending on the Relationship Between Applied Load and Maximum Bending Stress for Straight and Curved Bars

2020 ◽  
Author(s):  
Don Metzger
Keyword(s):  
Plastic Strain ◽  
Plastic Zone ◽  
Yield Point ◽  
Cross Section ◽  
Applied Load ◽  
Bending Stress ◽  
Stress Strain ◽  
Bending Load ◽  
Bending Capacity ◽  
The Relationship

Abstract Bending capacity in excess of the load required to cause yielding is due to a combination of work hardening and the effect of the plastic zone spreading toward the neutral axis. For materials of sufficiently high ductility, a fully developed plastic zone is achieved and the bulk of the section is stressed beyond yield. For lower ductility materials, failure may occur prior to full development of the plastic zone such that only a fraction of the cross section is at or above the yield stress. In such cases, the relationship between applied load and maximum bending stress becomes sensitive to the shape of the stress-strain curve near the yield point. This relationship is examined for straight and curved bars of rectangular and trapezoidal cross-section for tensile stress-strain curves characterized by nonlinear functions. The stress distribution as a function of applied load is determined analytically by enforcing moment equilibrium across the section. The strain distribution is determined through the classical condition of “planes remain plane” during deformation. The solutions provide analytically smooth load curves such that maximum stress can be directly plotted as a function of applied load. These plots exhibit three distinct regimes of response: 1) elastic, 2) development of plastic zone, and 3) fully developed plastic zone. Since the response is analytically smooth, the detailed relationship through the knee of the tensile curve can be examined. The results indicate that bending capacity is influenced significantly by the development of small amounts of plastic strain prior to reaching a yield point defined by the usual 0.2% plastic strain offset method. The results also show how loss of ductility with respect to tensile elongation translates into reduced bending load capacity in a non-linear relationship.

Numerical Simulation of the Four-Roll Bending Process for 2.25Cr-1Mo-0.25V Thick-Plate at Elevated Temperature

2017 ◽  
Author(s):  
Yafei Wang ◽  
Guangxu Cheng ◽  
Zaoxiao Zhang ◽  
Yun Li ◽  
Jianxiao Zhang
Keyword(s):  
Numerical Simulation ◽  
Elevated Temperature ◽  
Plate Thickness ◽  
Strain Curve ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Plate Bending ◽  
Stress Strain ◽  
Explicit Finite Element ◽  
Bending Process

In this paper, the four-roll plate bending process of 2.25Cr-1Mo-0.25V steel at elevated temperature is investigated by numerical simulation. This 3-D simulation is finished by using the elastic-plastic dynamic explicit finite element method (FEM) under the ANSYS/LS-DYNA environment. The strain softening behavior of 2.25Cr-1Mo-0.25V steel at elevated temperature is presented and discussed. The stress-strain relationship of the steel plate is modeled using a piecewise linear material model, with the stress-strain curve obtained through tensile tests. The plate bending process with a plate thickness of 150 mm is investigated. The amount and position of maximum plastic deformation are analyzed. The present study provides an important basis for the optimization of bending parameters and further investigation of the effect of high-temperature deformation on the resistance to hydrogen attack of 2.25Cr-1Mo-0.25V steel.

Numerical Analysis for Multi-Point Forming of Aluminum Alloy Profile

2014 ◽  
Vol 1035 ◽  
pp. 128-133 ◽  
Author(s):  
Xue Zhi Liu ◽  
Chun Guo Liu ◽  
Yuan Yao ◽  
Xue Guang Zhang
Keyword(s):  
Numerical Simulation ◽  
Aluminum Alloy ◽  
Numerical Analysis ◽  
Sheet Metal ◽  
Cross Section ◽  
Metal Parts ◽  
Sheet Metal Parts ◽  
Bending Process ◽  
A New Technique ◽  
Elastic Cushion

As a new technique to form sheet metal parts, Multi-point forming (MPF) also can be used on bending aluminum alloy profile. Since the Multi-Point Die (MPD) which replaces the traditional solid bending die is composed of many discrete punch elements, dimples always occur on the plate of profiles. To eliminate the dimpling defects, numerical simulation of the bending process with A6N01S-T5 aluminum alloy hollow profile using MPD were conducted. By comparing the bending effects on MPD with different size of punch elements and with different kind of elastic cushion, reasonable forming parameters were obtained. Pressing of Aluminum alloy profile with different radii on the MPD and solid die were simulated. The cross-section distortion indicated that the aluminum alloy profile can be formed with MPF technique while it has the advantage of flexibility. For the profile with large deformation, multi-step MPF method is a better choice due to its rapid reconfigurable characteristic.

The Microstructure Evolution and Twinning Characterization of AZ31 Mg Alloy Sheet in Low-Temperature Bending Process

2013 ◽  
Vol 690-693 ◽  
pp. 16-19
Author(s):  
Jun Wei Liu ◽  
Shi Qiang Lu ◽  
Ke Lu Wang ◽  
Gui Fa Li ◽  
Xuan Xiao
Keyword(s):  
Low Temperature ◽  
Microstructure Evolution ◽  
Room Temperature ◽  
Alloy Sheet ◽  
Mg Alloy ◽  
Az31 Mg Alloy ◽  
Bending Process ◽  
Hot Rolled ◽  
The Relationship

The relationship among stress, cavities and twinning in the room-temperature bending process of hot-rolled AZ31 Mg alloy sheet was researched. It can be seen that the mount of twins which was tightly affected by stress value increases with the distance to press point. Otherwise, the cavities and twinning which seem totally independent, in fact affect with each other. Some cavities were hindered by twins and can not further grow up. Then, the relationship between slip and twinning was also roughly discussed. The dislocation lines in twins can be thought to release the stress focus and were beneficial for deformation.

scholarly journals STRESS‐STRAIN ANALYSIS IN THE SOIL SAMPLE DURING LABORATORY TESTING

2007 ◽  
Vol 13 (1) ◽  
pp. 63-70 ◽  
Author(s):  
Neringa Verveckaite ◽  
Jonas Amsiejus ◽  
Vincentas Stragys
Keyword(s):  
Cross Section ◽  
Strain Analysis ◽  
Soil Strength ◽  
Horizontal Component ◽  
Stress And Strain ◽  
Stress Strain ◽  
Real Distribution ◽  
The Cross ◽  
Shear Box ◽  
Distribution Of Stress

During the determination of soil strength and compressibility in a laboratory by different apparatus soil is loaded in a different way. It has an influence on stress‐strain distribution in a sample. Some factors are not evaluated during the results interpretation, for example, friction between soil and device metal parts. The finite‐element method analysis also shows that during triaxial, oedometer, shear box tests distribution of stress and strain in the sample is non‐uniform. A special apparatus was designed and used for determining horizontal component of stress in the cross‐section of the sample. It was determined for sands that horizontal component of stress in the cross‐section centre is significantly smaller than at the edges. Increasing load plastic deformations are developing not in the whole sample but in particular places. If we know a real distribution of stress and strain in the sample, it is possible to determine the soil strength and deformation parameters in a more precise way or to rate the influence of different factors on soil properties.

Formulation of Equivalent Plastic Strain Accumulated in Rotating Bending Process of Metal Tubes for Severe Plastic Deformation

2014 ◽  
Vol 887-888 ◽  
pp. 907-911
Author(s):  
Zi Cheng Zhang ◽  
Kenichi Manabe ◽  
Tsuyoshi Furushima ◽  
Kazuo Tada
Keyword(s):  
Plastic Deformation ◽  
Stress Distribution ◽  
Plastic Strain ◽  
Severe Plastic Deformation ◽  
Significant Influence ◽  
Equivalent Plastic Strain ◽  
Stress And Strain ◽  
Bending Process ◽  
Rotating Bending ◽  
And Control

The newly proposed rotating bending process of metal tubes is a novel kind of Severe Plastic Deformation (SPD) process, which is expected to refine and control the microstructure of metallic tubular materials. The stress distribution and accumulated equivalent plastic strain of deformation part have a significant influence on the microstructure refinement and control of metal tubes during the rotating bending process. The present study focused on the analysis of stress and strain of deformation part during rotating bending process of metal tubes. The model of the deforming metal tubes was proposed. The formulas for determining the stress and accumulated equivalent plastic strain were successfully achieved by analyzing the deformation of metal tubes during rotating bending process.

Numerical Simulation Study of Quasi-Static Loading and Dynamic Loading for Micro Bending Forming of Copper Foil

2016 ◽  
Vol 723 ◽  
pp. 503-511
Author(s):  
Wen Hao Zhang ◽  
Qing Qian ◽  
Zong Bao Shen ◽  
You Juan Ma ◽  
Hui Xia Liu
Keyword(s):  
Numerical Simulation ◽  
Plastic Strain ◽  
Strain Rate ◽  
Dynamic Loading ◽  
Static Loading ◽  
Shock Loading ◽  
Equivalent Plastic Strain ◽  
Plastic Strain Rate ◽  
Laser Shock ◽  
Feature Size

A variety of micro forming processes has been invented, and the size effects have become a research hotspot at home and abroad. Micro bending molds with different feature sizes were designed. Quasi-static tester loading and dynamic laser shock loading with soft punch for micro bending forming was studied by numerical simulation respectively based on ANSYS implicit analysis and LS-DYNA explicit analysis. The constitutive models of workpiece are bilinear kinematic hardening model and Johnson-cook model respectively. The effects of different loading conditions and feature sizes of the die on the forming depth, equivalent plastic strain and equivalent plastic strain rate were studied. The results of numerical simulation show that, with the increasing of feature size of the mold, the forming depth under two kinds of loading conditions shows a tendency to increase. In dynamic laser shock loading, the equivalent plastic strain and equivalent plastic strain rate of the key position of the bent part would decrease with the increasing of the feature size of the die. While in quasi-static loading, the opposite law is shown. The research shows that, the flexible micro-bending processes with different loading models showed similar size effect. However, compared with quasi-static loading, in dynamic loading, the strain of forming parts is more centralized, and there is a high strain rate and better formability of the workpiece.

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