Experiments and numerical simulations on joint formation and material flow during resistance upset welding of WC-10Co and B318 steel

2021 ◽  
Vol 296 ◽  
pp. 117164
Author(s):  
Lingyu Chen ◽  
Zhongning Guo ◽  
Chong Zhang ◽  
Yuanbo Li ◽  
Yuzhen Jia ◽  
...  
Keyword(s):  
Numerical Simulations ◽  
Material Flow ◽  
Joint Formation

The Analysis of Multistage Deep Drawing of AA5754 Aluminum Alloy

2010 ◽  
Vol 55 (4) ◽  
pp. 1173-1184 ◽  
Author(s):  
M. Paćko ◽  
M. Dukat ◽  
T. Śleboda ◽  
M. Hojny
Keyword(s):  
Aluminum Alloy ◽  
Numerical Analysis ◽  
Numerical Simulations ◽  
Contact Surface ◽  
Deep Drawing ◽  
Material Flow ◽  
Drawing Process ◽  
Deep Drawing Process ◽  
Side Walls ◽  
Good Agreement

The Analysis of Multistage Deep Drawing of AA5754 Aluminum AlloyThis work is focused on the multistage deep drawing of AA5754 aluminum alloy box-type part with flange. Both experimental and numerical analysis were performed in this study to predict causes of contraction and cracking occurring in deformed product in respect to the changes of friction conditions on tool-drawn part contact surface. The numerical simulations were performed using eta/DYNAFORM software and LS-DYNA® solver. The research showed, that the results of the simulation are in very good agreement with the results of the real multistage deep drawing processes. Moreover, this study showed, that proper conditions of friction on the tool-drawpiece contact surface is crucial for the correctness of the analyzed deep drawing process. Too large friction can restrict the material flow, particularly along the edge connecting the bottom and side-walls of the drawpiece, causing wrinkling and cracking.

Analysis of the Shape of Stamp on the Distribution of Deformation in the Process of Alternate Pressing and Multiaxial Compression

2015 ◽  
Vol 220-221 ◽  
pp. 963-968 ◽  
Author(s):  
Marcin Kwapisz
Keyword(s):  
Numerical Simulations ◽  
Material Flow ◽  
Iterative Process ◽  
Compressive Strain ◽  
Thermomechanical Analysis ◽  
Plastic Working ◽  
Compression Process ◽  
Commercial Software ◽  
Multiaxial Compression ◽  
Kinetics Of

The paper presents the results of numerical simulations of the alternate indirect extrusion and multiaxial compression process, performed using commercial software designed for the thermomechanical analysis of plastic working processes, Forge 2009. The paper presents selected results on the distribution of deformation in the process of alternating extrusion and multiaxial compression. Examples of modifications to the shape of the die and punch, and their effect on the kinetics of the material flow as well as the likelihood of defects of materials are provided. The results confirm that suitable modifying the shape of the die and punch enables to obtain a material with no internal defects. Iterative process, alternating squeezing and multiaxial compressive strain allows the accumulation of which results in fragmentation of the microstructure.

A Prediction of the Optimal Blank Contour of an Inner Elliptic Flange from Flanging

2012 ◽  
Vol 152-154 ◽  
pp. 931-934
Author(s):  
Chin Tarn Kwan ◽  
Jui Tsai Chang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Simulations ◽  
Process Parameters ◽  
Material Flow ◽  
Flow Characteristics ◽  
Data Sets ◽  
The Finite Element Method ◽  
Aspect Ratios ◽  
Abductive Network

In this paper, the finite element method is employed in conjunction with the abductive network to predict the optimum blank contour of an inner elliptic flange with unevenness in the flanging process. Different flange heights combined with various aspect ratios of the inner elliptic flange are taken into account as the process parameters in this study. A finite element-based code is utilized to investigate the material flow characteristics under different process parameters, and the abductive network is then employed to synthesize the data sets obtained from numerical simulations, thus establishing a predictive model. From this model, an optimal blank contour for producing an elliptic inner flange with unevenness can be found.

The Potential and Application Areas of Forging Aided by Shear Stress

2013 ◽  
Vol 212 ◽  
pp. 91-94
Author(s):  
Marek Tkocz ◽  
Zdzisław Cyganek ◽  
Franciszek Grosman
Keyword(s):  
Finite Element ◽  
Shear Stress ◽  
Finite Element Model ◽  
Numerical Simulations ◽  
Metal Forming ◽  
Material Flow ◽  
Strain Distribution ◽  
Vertical Motion ◽  
Element Model ◽  
Local Strains

The paper demonstrates the potential of unconventional metal forming method that consists in introducing shear stress at the die/workpiece interface during compression. In practice it can be realized by induction of reciprocating, vertical motion of a punch that adheres strongly to a workpiece. To estimate an effect of the method on the material flow, a relevant finite element model has been developed and the selected results of numerical simulations are presented in the paper. In comparison to the conventional forging, forming aided by shear stress is able to provide a number of benefits such as significant increase of local strains, lower press loads and the opportunity to control the strain distribution in the workpiece volume. Perspectives for continuation of the studies as well as possible application areas of forging aided by shear stress are discussed in the summary.

Application of Abductive Network and FEM to Predict the Optimal Blank Contour of an Inner Elliptic Flange from Flanging

2012 ◽  
Vol 445 ◽  
pp. 253-258
Author(s):  
Chin Tarn Kwan ◽  
Jui Tsai Chang ◽  
Ching Tien Lin
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Simulations ◽  
Process Parameters ◽  
Material Flow ◽  
Flow Characteristics ◽  
Data Sets ◽  
The Finite Element Method ◽  
Aspect Ratios ◽  
Abductive Network

In this paper, the finite element method is employed in conjunction with the abductive network to predict the optimum blank contour of an inner elliptic flange with unevenness in the flanging process. Different flange heights combined with various aspect ratios of the inner elliptic flange are taken into account as the process parameters in this study. A finite element-based code is utilized to investigate the material flow characteristics under different process parameters, and the abductive network is then employed to synthesize the data sets obtained from numerical simulations, thus establishing a predictive model. From this model, an optimal blank contour for producing an elliptic inner flange with unevenness can be found.

Material Flow in FSW of AA7075-T6 Butt Joints: Continuous Dynamic Recrystallization Phenomena

2006 ◽  
Vol 128 (3) ◽  
pp. 428-435 ◽  
Author(s):  
L. Fratini ◽  
G. Buffa ◽  
D. Palmeri ◽  
J. Hua ◽  
R. Shivpuri
Keyword(s):  
Dynamic Recrystallization ◽  
Numerical Simulations ◽  
Material Flow ◽  
Geometrical Parameters ◽  
Butt Joints ◽  
Viscoplastic Model ◽  
Continuous Dynamic Recrystallization ◽  
The Core ◽  
Continuous Dynamic

In the paper the continuous dynamic recrystallization (CDRX) phenomena occurring in the FSW of AA7075-T6 butt joints is investigated at the varying of the most relevant technological and geometrical parameters. In particular, both experiments and numerical simulations obtained utilizing a 3D Lagrangian implicit, coupled, rigid-viscoplastic model have been developed on FSW butt joints. The resulting microstructure at the core of the weldings is correlated to the material flow occurring during the FSW process.

Material flow in FSW of AA7075–T6 butt joints: numerical simulations and experimental verifications

2006 ◽  
Vol 11 (4) ◽  
pp. 412-421 ◽  
Author(s):  
L. Fratini ◽  
G. Buffa ◽  
D. Palmeri ◽  
J. Hua ◽  
R. Shivpuri
Keyword(s):  
Numerical Simulations ◽  
Material Flow ◽  
Butt Joints

Simulation Assisted Analysis of Material Flow in Roller Clinched Joints

2014 ◽  
Vol 966-967 ◽  
pp. 628-640 ◽  
Author(s):  
Daniel Rill ◽  
Maria Weiß ◽  
Hartmut Hoffmann ◽  
Wolfram Volk
Keyword(s):  
Simulation Model ◽  
Process Parameters ◽  
Material Flow ◽  
Optimization Approach ◽  
Joint Formation ◽  
Novel Technique ◽  
Model Based ◽  
Simulation Strategy ◽  
The Asymmetry ◽  
Assisted Analysis

Round point clinching with rotational tool movement is a novel technique to join endless sheets of same or different metals in a quick and economic way. The main challenges are the asymmetry of the resulting clinch points as well as the non-perpendicular impact and retraction of the tools. To address these challenges, the material flow during the joint formation is closely examined. For this purpose an experimentally validated simulation strategy was developed. The influence of the process parameters on the material flow was then analyzed using this simulation model. Based on these crucial insights, an optimization approach is presented.

Application of Incremental Metal Forming for Production of Aircraft Integral Panels

2013 ◽  
Vol 212 ◽  
pp. 243-246 ◽  
Author(s):  
Marek Tkocz ◽  
Franciszek Grosman
Keyword(s):  
Numerical Simulations ◽  
Process Parameters ◽  
Metal Forming ◽  
Material Flow ◽  
High Surface ◽  
Bulk Metal ◽  
Bulk Metal Forming ◽  
The Press ◽  
Laboratory Device ◽  
Number Of Segments

The principle and the potential of an incremental bulk metal forming method is presented in the paper. It can be used for manufacturing of the specific aircraft integral panels in a form of ribbed parts with high surface/thickness ratio. A unique laboratory device has been developed to investigate the effect of process parameters on the material flow and the press load. It utilizes tooling consisting of working rolls, a die and a punch that is divided into a number of segments. The results of preliminary numerical simulations proved that the presented forming method offers significant advantages in comparison with conventional forging.

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