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Li Zhigang - One of the best experts on this subject based on the ideXlab platform.

  • Fast FE Analysis system for sheet metal stamping—FASTAMP
    Journal of Materials Processing Technology, 2007
    Co-Authors: Du Ting, Liu Yuqi, Zhang Zhibing, Li Zhigang
    Abstract:

    Abstract FASTAMP is a fast FE Analysis system for sheet metal stamping, which is based on an improved inverse approach and dynamic explicit method. The improved algorithm successfully avoids the strain localization problem existing in plastic deformation theory to lay foundation for the inverse approach. Quadrilateral membrane elements together with DKQ bend element are used in the algorithm to considering bending effect. More accurate model is built in the system so that the process parameters, such as blank-holding force, friction and drawbead restriction, can be taken into account. Press types, eject plate and other influence factors on sheet metal forming are also considered. As a result, the system can be applied to potential defects detection, formability Analysis, Material selection and process verification. Product design, process planning and die design can be integrated by FASTAMP, so that product formability can be ensured, optimization of stamping process and die structure achieved.

  • fast fe Analysis system for sheet metal stamping fastamp
    Journal of Materials Processing Technology, 2007
    Co-Authors: Du Ting, Liu Yuqi, Zhang Zhibing, Li Zhigang
    Abstract:

    Abstract FASTAMP is a fast FE Analysis system for sheet metal stamping, which is based on an improved inverse approach and dynamic explicit method. The improved algorithm successfully avoids the strain localization problem existing in plastic deformation theory to lay foundation for the inverse approach. Quadrilateral membrane elements together with DKQ bend element are used in the algorithm to considering bending effect. More accurate model is built in the system so that the process parameters, such as blank-holding force, friction and drawbead restriction, can be taken into account. Press types, eject plate and other influence factors on sheet metal forming are also considered. As a result, the system can be applied to potential defects detection, formability Analysis, Material selection and process verification. Product design, process planning and die design can be integrated by FASTAMP, so that product formability can be ensured, optimization of stamping process and die structure achieved.

Du Ting - One of the best experts on this subject based on the ideXlab platform.

  • Fast FE Analysis system for sheet metal stamping—FASTAMP
    Journal of Materials Processing Technology, 2007
    Co-Authors: Du Ting, Liu Yuqi, Zhang Zhibing, Li Zhigang
    Abstract:

    Abstract FASTAMP is a fast FE Analysis system for sheet metal stamping, which is based on an improved inverse approach and dynamic explicit method. The improved algorithm successfully avoids the strain localization problem existing in plastic deformation theory to lay foundation for the inverse approach. Quadrilateral membrane elements together with DKQ bend element are used in the algorithm to considering bending effect. More accurate model is built in the system so that the process parameters, such as blank-holding force, friction and drawbead restriction, can be taken into account. Press types, eject plate and other influence factors on sheet metal forming are also considered. As a result, the system can be applied to potential defects detection, formability Analysis, Material selection and process verification. Product design, process planning and die design can be integrated by FASTAMP, so that product formability can be ensured, optimization of stamping process and die structure achieved.

  • fast fe Analysis system for sheet metal stamping fastamp
    Journal of Materials Processing Technology, 2007
    Co-Authors: Du Ting, Liu Yuqi, Zhang Zhibing, Li Zhigang
    Abstract:

    Abstract FASTAMP is a fast FE Analysis system for sheet metal stamping, which is based on an improved inverse approach and dynamic explicit method. The improved algorithm successfully avoids the strain localization problem existing in plastic deformation theory to lay foundation for the inverse approach. Quadrilateral membrane elements together with DKQ bend element are used in the algorithm to considering bending effect. More accurate model is built in the system so that the process parameters, such as blank-holding force, friction and drawbead restriction, can be taken into account. Press types, eject plate and other influence factors on sheet metal forming are also considered. As a result, the system can be applied to potential defects detection, formability Analysis, Material selection and process verification. Product design, process planning and die design can be integrated by FASTAMP, so that product formability can be ensured, optimization of stamping process and die structure achieved.

Jaroslav Mackerle - One of the best experts on this subject based on the ideXlab platform.

Maria Eugenia Moreyra Garlock - One of the best experts on this subject based on the ideXlab platform.

  • probabilistic fire Analysis Material models and evaluation of steel structural members
    Journal of Structural Engineering-asce, 2015
    Co-Authors: Negar Elhami Khorasani, Paolo Gardoni, Maria Eugenia Moreyra Garlock
    Abstract:

    AbstractThis paper provides a methodology to perform probabilistic Analysis of steel structural members under fire loading. As part of developing the methodology, probabilistic models are proposed for mechanical and thermal properties of steel and thermal properties of insulating Materials. The two important mechanical properties of steel that significantly influence the results are (1) yield strength, and (2) modulus of elasticity. The models developed for thermal properties include specific heat, thermal conductivity, and thermal strain of steel; and density, thermal conductivity and specific heat for insulating Materials. A Bayesian statistical approach is used to develop the proposed probabilistic models using the data available in the literature. The proposed probabilistic models are compared to the available deterministic models from codes and standards. After models are developed for temperature-dependent Material properties, a procedure to perform probabilistic Analysis of a steel member and an ap...

Zhen-guo Yang - One of the best experts on this subject based on the ideXlab platform.

  • Failure Analysis on Abnormal Thinning of Elbows in the Economizer at Waste Heat Boiler System
    Volume 6B: Materials and Fabrication, 2015
    Co-Authors: Sheng-hui Wang, Xiao-ming Luo, Yu-qing Yang, Jian Tang, Zhen-guo Yang
    Abstract:

    Abnormal wall thinning of elbows were detected in the economizer at waste heat boiler system. In the failure Analysis, Material Analysis, metallographic examination, macro- and microstructure Analysis and composition Analysis were conducted. We analyzed the causes and mechanisms of abnormal wall thinning. The failure causes were found to be sulfuric dew point corrosion. Finally, corresponding countermeasures were suggested.Copyright © 2015 by ASME

  • failure Analysis on abnormal wall thinning of heat transfer titanium tubes of condensers in nuclear power plant part ii erosion and cavitation corrosion
    Engineering Failure Analysis, 2014
    Co-Authors: Feijun Chen, Cheng Yao, Zhen-guo Yang
    Abstract:

    Abstract In Part I of the failure Analysis on abnormal wall thinning of heat-transfer titanium tubes used in condensers in nuclear power plant, we analyzed the causes and mechanisms of abnormal thinning that commonly happened at the contact part between the tubes and the support plates. This kind of failure was the mainstream failure type in our case and the main causes were found to be eccentric contact wear and three-body contact wear rooted in processing defect of internal borings, corrosion products deposit and sagging, and foreign particles. However, there were still some individual failure tubes with different failure sites and modes and were located under the bypass pipes at the shoulder of the tube tower instead of in its lower part, obviously telling another failure story. In Part II of the failure Analysis, Material Analysis, metallographic examination, mechanical performance tests, macro- and microstructure Analysis and composition Analysis were conducted. The failure causes were found to be erosion and cavitation corrosion and the synergetic effect of them. Finally, corresponding countermeasures were suggested.