近场动力学研究进展

发布时间：2018-11-05 07:18

【摘要】：近场动力学(Peridynamics或PD)理论基于非局部作用思想,采用空间积分描述物质内部作用,对于从连续到非连续、微观到宏观的力学行为具有统一的表述,数值上天然具有无网格属性和不连续求解功能,在分析不连续,多尺度等问题时展现出了具有优势的适用性和可靠性.本文介绍了近场动力学的发展背景;概述了其理论基础、数值实现过程和计算体系,并在此基础上探讨了近场动力学理论和数值模型的适定性,以及与传统连续介质模型和分子动力学模型进行耦合的可行性;系统分析了近场动力学方法在各个领域上的应用发展现状和趋势,包括静态、动态破坏问题,基于近场动力学的材料模型,以及新兴的疲劳问题研究和多尺度、多物理场的耦合问题;最后对近场动力学方法目前存在的局限性和将来的研究进行了探讨.
[Abstract]:The theory of near field dynamics (Peridynamics or PD) is based on the idea of nonlocal action and uses space integral to describe the internal action of matter. It has a unified description of the mechanical behavior from continuous to discontinuous, microscopic to macroscopic. Numerically, it has meshless properties and discontinuous solving functions. It has shown the advantage of applicability and reliability in the analysis of discontinuous and multi-scale problems. The development background of near-field dynamics is introduced in this paper. The theoretical basis, numerical realization process and calculation system are summarized. On this basis, the suitability of near-field dynamics theory and numerical model is discussed, and the feasibility of coupling with traditional continuum model and molecular dynamics model is also discussed. The present situation and trend of application of near-field dynamics in various fields are systematically analyzed, including static and dynamic failure problems, material models based on near-field dynamics, emerging fatigue problems and multi-scale. Coupling of multiple physical fields; Finally, the limitations of the near-field dynamic method and the future research are discussed.
【作者单位】：上海交通大学船舶海洋与建筑工程学院;上海交通大学海洋工程国家重点实验室;上海交通大学高新船舶与深海开发装备协同创新中心;
【基金】：国家自然科学基金(51478265;51679136)
【分类号】：O313

【相似文献】