Material Flow

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Chuan Song Wu - One of the best experts on this subject based on the ideXlab platform.

  • Material Flow in ultrasonic vibration enhanced friction stir welding
    Journal of Materials Processing Technology, 2015
    Co-Authors: Chuan Song Wu
    Abstract:

    Abstract An ultrasonic vibration enhanced friction stir welding (UVeFSW) system was developed, in which the ultrasonic energy was transmitted directly into the localized area of the workpiece near and ahead of the rotating tool by a specially-designed sonotrode. The interaction mechanism of the ultrasonic vibration with the deformed Material around the FSW tool was investigated experimentally by integrating three configurations of marker Material and metallographic analysis. The observation and comparison of the marker Material distribution on different cross-sections of butt-weld specimens revealed that there were two main Material Flow patterns in stir zone of 2024-T4 aluminium alloy butt welds in UVeFSW, i.e., the continuous Flow (upper one third of weld) and the non-continuous Flow (lower two thirds of weld). The ultrasonic energy enlarged the volume of the deformed Material around the pin, enhanced the stability of the continuous Material Flow and the Material strain of the non-continuous Flow obviously, and weakened the degree of vertical Material transfer. The results provided a reasonable explanation for the improvement of weld joint quality in UVeFSW.

  • Characterization of plastic deformation and Material Flow in ultrasonic vibration enhanced friction stir welding
    Scripta Materialia, 2015
    Co-Authors: Xiaochao Liu, Chuan Song Wu, G K Padhy
    Abstract:

    Material Flow and plastic deformation in ultrasonic vibration enhanced friction stir welding are visualized by employing a special marker Material and welding procedure. Based on the results, three methods are developed to evaluate the volume of deformed Material, the Material Flow velocity and the strain/strain rate, and the effect of ultrasonic vibration on the plastic deformation and Material Flow around the tool is characterized.

G K Padhy - One of the best experts on this subject based on the ideXlab platform.

Xiaochao Liu - One of the best experts on this subject based on the ideXlab platform.

Xiaomin Deng - One of the best experts on this subject based on the ideXlab platform.

  • investigation of Material Flow during friction extrusion process
    International Journal of Mechanical Sciences, 2014
    Co-Authors: Xing Zhao, Xiaomin Deng, Anthony P Reynolds, Michael A. Sutton, Stephen R Mcneill, X Ke
    Abstract:

    Abstract Material Flow during a friction extrusion process is investigated. A three-dimensional computational fluid dynamics (CFD) model of the friction extrusion process is proposed with a no-slip contact condition between the rotating tool and the Material being processed. In the CFD model, the Material considered is aluminum alloy 6061. During processing the Material is treated as a non-Newtonian fluid with a viscosity that is temperature and strain rate dependent. As a first model of this process, the focus of the CFD model is to provide initial insights about the Material Flow field, which can be used to help with the design and interpretation of experiments to measure the Flow field. Due to the lack of experimental validation data at this stage, and to provide an understanding of the accuracy and validity of CFD simulation predictions of the velocity field, the same process but with a model fluid and without extrusion is considered. This modified process has been studied analytically, numerically, and experimentally, and CFD simulation predictions have been verified analytically and validated experimentally. Then the full process with consideration of extrusion is modeled using CFD and simulation predictions of the Flow field are presented.

  • two dimensional finite element simulation of Material Flow in the friction stir welding process
    Journal of Manufacturing Processes, 2004
    Co-Authors: Xiaomin Deng
    Abstract:

    Abstract Solid mechanics based finite element models and computational procedures have been developed by the authors to study and simulate the friction stir welding process. In this paper, two-dimensional simulation results of the Material Flow pattern and spatial velocity field around the rotating tool pin during welding, and the positions of Material particles around the pin after welding, are presented. Material Flow pattern predictions are found to compare favorably with experimental observations. Simulation results suggest that Material particles in front of the tool pin tend to pass and get behind the rotating pin from the retreating side of the pin. Similarities between predicted velocity fields based on two different tool-workpiece interface models are described in detail, and implications of these findings (e.g., to fluid dynamics based models) are discussed.

  • finite element simulation of Material Flow in friction stir welding
    Science and Technology of Welding and Joining, 2001
    Co-Authors: S. Xu, Xiaomin Deng, Anthony P Reynolds, T U Seidel
    Abstract:

    AbstractA brief summary of recent finite element simulation results for the friction stir welding process is presented. The focus of the present study is on the characterisation of Material Flow around the rotating tool pin. Material Flow patterns predicted by finite element simulations are found to compare favourably with experimental observations. The simulation results also reveal that Material particles tend to pass and move behind the rotating pin from the trailing side, rather than both sides, of the pin. Possible variations in the Material Flow pattern due to variations in process parameters are discussed.

Kazutaka Okamoto - One of the best experts on this subject based on the ideXlab platform.

  • Material Flow during friction stir spot welding
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2010
    Co-Authors: Sergey Mironov, Y. Sato, Kazutaka Okamoto
    Abstract:

    Material Flow during friction stir spot welding (FSSW) is investigated using tracer Material technique. Three distinct regions are developed in a weld after the rotating shoulder comes in close contact with the upper sheet. They are called Flow transition zone, stir zone, and torsion zone which are evolved due to the combination of rotational, horizontal and vertical motions of the plasticized Material. An incorporation of the upper and lower sheet Materials takes place in the Flow transition zone, and the intermingled Materials Flowing from the Flow transition zone contribute primarily to the formation of the stir zone. A new model of Material Flow during FSSW is developed on the basis of experimental observations. It is believed that the intrinsic driving force for the downward motion of the plasticized Material is originated from the Material release from the rotating pin through an outward-spinning motion.

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