In this paper, the magnetic-elastic-plastic deformation behavior is studied for a ferromagnetic plate with simple supports. The perturbation formula of magnetic force is first derived based on the perturbation techniq...In this paper, the magnetic-elastic-plastic deformation behavior is studied for a ferromagnetic plate with simple supports. The perturbation formula of magnetic force is first derived based on the perturbation technique, and is then applied to the analysis of deformation characteristics with emphasis laid on the analyses of modes, symmetry of deformation and influences of incident angle of applied magnetic field on the plate deformation. The theoretical analyses offer explanations why the configuration offer- romagnetic rectangular plate with simple supports under an oblique magnetic field is in-wavy type along the x-direction, and why the largest deformation of the ferromagnetic plate occurs at the incident angle of 45°for the magnetic field. A numerical code based on the finite element method is developed to simulate quantitatively behaviors of the nonlinearly coupled multi-field problem. Some characteristic curves are plotted to illustrate the magneto--elastic-plastic deflections, and to reveal how the deflections can be influenced by the incident angle of applied magnetic field. The deformation characteristics obtained from the numerical simulations are found in good agreement with the theoretical analyses.展开更多
列车运行时会产生激烈的振动荷载,会使铁路地基与路基发生振动。铁路地基过大的振动反应将会给列车运行带来安全隐患,降低乘车舒适性,同时也会给周边环境带来不良影响,因此进一步研究和认识铁路地基与路基的动力特性意义重大。文章以Bio...列车运行时会产生激烈的振动荷载,会使铁路地基与路基发生振动。铁路地基过大的振动反应将会给列车运行带来安全隐患,降低乘车舒适性,同时也会给周边环境带来不良影响,因此进一步研究和认识铁路地基与路基的动力特性意义重大。文章以Biot固结理论为基础,采用数值模拟的方法,用弹塑性土本构模型(Pastor-Zienkiewicz Mark Model III)描述弹塑性砂土的动力行为;以有限元软件FSSI-CAS 2D与Mat Lab为工具进一步研究富含地下水环境下的弹塑性砂土路基-地基系统在列车通过时所产生的动力特性。根据计算结果得到了地基内部加速度、速度及位移的变化规律。展开更多
基金the National Natural Science Foundation of China (10672070, 10302009)the National Basic Research Program of China (2007CB607560)+1 种基金the Program for New Century Talented (NCET-06-0896) the Natural Science Fund of Gansu Province
文摘In this paper, the magnetic-elastic-plastic deformation behavior is studied for a ferromagnetic plate with simple supports. The perturbation formula of magnetic force is first derived based on the perturbation technique, and is then applied to the analysis of deformation characteristics with emphasis laid on the analyses of modes, symmetry of deformation and influences of incident angle of applied magnetic field on the plate deformation. The theoretical analyses offer explanations why the configuration offer- romagnetic rectangular plate with simple supports under an oblique magnetic field is in-wavy type along the x-direction, and why the largest deformation of the ferromagnetic plate occurs at the incident angle of 45°for the magnetic field. A numerical code based on the finite element method is developed to simulate quantitatively behaviors of the nonlinearly coupled multi-field problem. Some characteristic curves are plotted to illustrate the magneto--elastic-plastic deflections, and to reveal how the deflections can be influenced by the incident angle of applied magnetic field. The deformation characteristics obtained from the numerical simulations are found in good agreement with the theoretical analyses.
文摘列车运行时会产生激烈的振动荷载,会使铁路地基与路基发生振动。铁路地基过大的振动反应将会给列车运行带来安全隐患,降低乘车舒适性,同时也会给周边环境带来不良影响,因此进一步研究和认识铁路地基与路基的动力特性意义重大。文章以Biot固结理论为基础,采用数值模拟的方法,用弹塑性土本构模型(Pastor-Zienkiewicz Mark Model III)描述弹塑性砂土的动力行为;以有限元软件FSSI-CAS 2D与Mat Lab为工具进一步研究富含地下水环境下的弹塑性砂土路基-地基系统在列车通过时所产生的动力特性。根据计算结果得到了地基内部加速度、速度及位移的变化规律。
