scholarly journals Deformation Behavior of Thin-Walled ERW Tubes inBending Method with Slight Reduction in Diameter and FEM Simulation

2011 ◽  
Vol 52 (605) ◽  
pp. 715-719 ◽  
Author(s):  
Osamu SONOBE ◽  
Yuji HASHIMOTO ◽  
Koji SUZUKI ◽  
Yukikazu UENO ◽  
Masao OKADA ◽  
...  
Keyword(s):  
Deformation Behavior ◽  
Fem Simulation ◽  
Slight Reduction ◽  
Thin Walled

Modeling of Macro-deformation Behavior of Thin-Walled Aluminum Foam by Gas Injection Method

2017 ◽  
Vol 26 (7) ◽  
pp. 3307-3318 ◽  
Author(s):  
Chen Xiang ◽  
Wang Ningzhen ◽  
Yuan Jianyu ◽  
Li Yanxiang ◽  
Zhang Huawei ◽  
...  
Keyword(s):  
Deformation Behavior ◽  
Aluminum Foam ◽  
Gas Injection ◽  
Injection Method ◽  
Thin Walled

scholarly journals MODAL TRIGGERED NONLINEARITIES FOR DAMAGE LOCALIZATION IN THIN WALLED FRC STRUCTURES – A NUMERICAL STUDY

2016 ◽  
Vol 14 (1) ◽  
pp. 21 ◽  
Author(s):  
Tobias Rademacher ◽  
Manfred Zehn
Keyword(s):  
Numerical Study ◽  
Fem Simulation ◽  
Harmonic Distortion ◽  
Mode Shapes ◽  
Novel Approach ◽  
Simulation Based ◽  
Novel Method ◽  
Thin Walled ◽  
Modal Description ◽  
Nonlinear Measure

This paper presents a novel method for detecting locations of damages in thin walled structural components made of fiber reinforced composites (FRC). Therefore, the change of harmonic distortion, which is found by current research to be very sensitive to delamination, under resonant excitation will be derived from FEM-simulation. Based on the linear modal description of the undamaged structure and the damage-induced nonlinearities represented by a nonlinear measure, two spatial damage indexes have been formulated.The main advantage of this novel approach is that the information about the defect is represented mainly by changes in the modal harmonic distortion (MHD), which just needs to be measured in one (or few) structural points. The spatial resolution is given by the pairwise coupling of the MHD with the corresponding mode shapes.

Thin-Walled Tube Made of AZ31 Magnesium Alloy Fabricated by New Compound Extrusion Including Direct Extrusion and Multi-pass Bending

2021 ◽  
Author(s):  
LI Xing lin ◽  
Hongjun Hu ◽  
Zhang Huiling ◽  
Zhao Hui ◽  
ZHANG Dingfei ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Magnesium Alloy ◽  
Fem Simulation ◽  
Az31 Magnesium Alloy ◽  
Process Conditions ◽  
Direct Extrusion ◽  
Tube Extrusion ◽  
Fem Method ◽  
Thin Walled Tube ◽  
Thin Walled

Abstract A new severe plastic deformation for manufacturing thin-walled tube made of AZ31 magnesium alloy called TEB(Tube-Extrusion-Bending ) process, which combines direct extrusion with two step bending,has been developed to manufacture tube.The TEB process has been researched by using finite element modeling (FEM) method. The rules of extrusion temperatures and the extrusion forces varying with process parameters have been developed. A TEB process with installed containers and dies has been constructed to perform tests in order to validate the FEM model with different process conditions. And the microstructures evolution have been researched based on effective strains evolution. The results showed that refined and uniform microstructures can be achieved by TEB process. The research results showed that the TEB process would produce the serve plastic deformation and improve the recrystallization of the grains.The comparisons of FEM simulation and experimental results have been made to obtain the relative important principles of TEB process.

Residual Stresses Distributions within Thin-Walled Ceramic-Metal Seal

2012 ◽  
Vol 503-504 ◽  
pp. 428-431 ◽  
Author(s):  
Guo Liang Zhang ◽  
Lei Shi ◽  
Da Zhi Jin
Keyword(s):  
Thermal Expansion ◽  
Residual Stresses ◽  
Fem Simulation ◽  
Matrix Composites ◽  
Thermal Expansion Coefficients ◽  
Expansion Behavior ◽  
Metal Seal ◽  
Significant Difference ◽  
Thin Walled ◽  
Typical Configuration

Due to significant difference of thermal expansion coefficients between ceramic and metal, the residual stresses are deemed to be induced into the interior of matrix composites within the ceramic-metal seal systems. Many investigations of the residual stresses distributions on dissimilar solid materials joints so far have been carried out theoretically and experimentally, whereas ones of the residual stresses distributions within the thin-walled ceramic-metal seal systems are rarely performed. In order to obtain information for improving their seal structures in the future, the residual stresses distributions resulted from the thermal expansion behavior in the typical configuration of the thin-walled ceramic-metal seal are investigated by theoretical formulae, experimental observation and finite element method (FEM) simulation in this paper. The changing trends of the computational results of the residual stresses distributions agree with the experimental results of the measurement with X-ray diffractometer. The overall residual stresses are found to increase drastically near the welding interfaces. The highest tensile stress occurs at the outer surfaces of the ceramic near the welding interfaces.

FEM Simulation of Multipass Shape Rolling Processes

2010 ◽  
Vol 148-149 ◽  
pp. 1-6 ◽  
Author(s):  
Hai Liang Yu ◽  
Xiang Hua Liu
Keyword(s):  
Finite Element ◽  
Deformation Behavior ◽  
Fem Simulation ◽  
Element Model ◽  
Rolling Process ◽  
Pure Lead ◽  
Shape Rolling ◽  
First Pass ◽  
H Beam ◽  
Good Agreement

The updating geometric method was proposed to simulate the deformation behavior of workpiece during multipass shape rolling by using finite element method. Firstly, establish and solve the finite element model of the first pass shape rolling process, then update the geometric shape of workpiece after the first pass and delete rolls of the first pass, establish and mesh rolls of the second pass, modify the boundaries and material parameters of workpiece, and solve its deformation behavior during the second pass shape rolling. With the same steps, its deformation behavior during the following passes rolling could be solved. The method was applied to simulate the deformation behavior of a cube workpiece during six-pass H-beam rolling with split-rolling, and its shapes after every pass rolling process were obtained. Experiments on the deformation behavior of slab during multipass rolling were carried out by using pure lead in an experimental mill. The calculated results are in good agreement with the experimental ones.

An Approach for Analysis of Bulged Profile and Thickness Distribution of Tube in Free Hydro-Bulging Process

2012 ◽  
Vol 499 ◽  
pp. 127-131
Author(s):  
Xiao Feng Liu ◽  
Lian Fa Yang ◽  
Yu Xian Zhang
Keyword(s):  
Mathematical Model ◽  
Plastic Deformation ◽  
Finite Element ◽  
Wall Thickness ◽  
Deformation Behavior ◽  
Thickness Distribution ◽  
Plastic Deformation Behavior ◽  
Thin Walled Tube ◽  
Thin Walled ◽  
Tubular Components

Tubular components are widely used in the areas of automotive and aerospace industries due to their excellent properties. A mathematical model considering the bulged region as a parabola curve is proposed to examine the plastic deformation behavior of a thin-walled tube during the free hydro-bulged process. The finite element simulations of the free hydro-bulging process are carried out to verify the approach indirectly. The results indicate that the model is accurate and acceptable to figure out the circumferential radius, wall thickness and axial radius of the bulged profile.

A Case Study to Solve the Problem of Wall Thickness Attenuation during Extrusion to Produce a Complex Hollow Magnesium Profile

2009 ◽  
Vol 424 ◽  
pp. 227-234
Author(s):  
Luo Xing Li ◽  
Jia Zhou ◽  
X. He ◽  
Jie Zhou ◽  
Jurek Duczczyk
Keyword(s):  
Hydrostatic Pressure ◽  
Wall Thickness ◽  
Software Package ◽  
Practical Problem ◽  
Fem Simulation ◽  
Experimental Measurements ◽  
Thin Walled ◽  
Present Case Study

The present case study addressed a practical problem of wall thickness attenuation during extrusion to produce a complex thin-walled hollow magnesium profile. A HyperWorks FEM software package was employed to aid in identifying the causes for the wall thickness attenuation. Recommendations were made to adjust the interspacing between the mandrels and the height of the welding chamber. The modified dies yielded much improved results in terms of velocity and hydrostatic pressure uniformity. The wall thickness of the extrudate predicted using FEM simulation was very close to experimental measurements. The case study demonstrated the feasibility of using FEM simulation as a useful tool to solve industrial problems encountered in the production of complex profiles.

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