2021年4月19日21时，IMT全体研究生观看了由西安交通大学空天与力学研究院、国际应用力学中心主办的力学研讨会。本次研讨会的主持人是来自西安交通大学国际应用力学中心的刘子顺教授，主讲人是J. N. Reddy院士(Texas A&M University)，他的报告主题是“On the First- and Third-Order Shear Deformation Theories of Composite and Functionally Graded Beams and Plates”（复合材料和功能梯度梁和板的一阶和三阶剪切变形理论）。
会议掠影
J. N. Reddy院士在本讲座中详细介绍一阶和三阶剪切变形理论，使我们了解如何导出高阶理论。在推导梁和板的方程时，考虑了通过梁的高度或板的厚度的两种成分的材料变化，通过数值算例表明了剪切变形理论如何准确地预测层间应力。
报告开始，J. N. Reddy院士从古典板理论（CPT）、一阶剪切变形理论（FSDT）和三阶剪切变形理论（TSDT）的变形运动学和变形理论这几个部分具体介绍。
J. N. Reddy院士从剪切应力与剪切应变引入，详细讲解了三阶剪切变形理论的位移场。再而对功能分级结构展开介绍，介绍了功能分级材料的板刚度。之后阐述一阶剪切变形理论的位移场、线性应变和运动方程，板边缘的应力及结果。并总结了一阶剪切变形理论应力结果，具体详细推导了位移的弯曲平衡方程，对正交各项异性板简支情况下的结果进行细心讲解。最后通过对比古典板理论（CPT）、一阶剪切变形理论（FSDT）和三阶剪切变形理论（TSDT）的结果，进一步验证三阶剪切变形理论（TSDT）。
讲座结束后，IMT研究生也参与了讨论，纷纷分享自己的看法。2020级硕士党文表示：“这是一次很好的报告，让我们能直面国际上专家学者，不仅能学习到前沿的科研知识，还是一次锻炼英语的机会。”我们在这次报告中收获满满，从中拓展了研究思维，并对相关领域的前沿研究有了更深层次的理解，得到了极大的精神满足。
J. N. Reddy院士的生平简介
J. N. Reddy, the O'Donnell Foundation ChairⅣ Professor in J. Mike Walker '66 Department of Mechanical Engineering at Texas A&M University, is a highly-cited researcher, author of a large number of journal papers and 21 books (several with second, third, and fourth editions) on energy principles, variational methods, plates and shells, composite materials, mechanics of solids, and the finite element method (linear and nonlinear) and its applications. Dr. Reddy has delivered over 180 plenary, keynote, and invited lectures at international conferences; and taught 116 short courses; he advised 50 postdoctoral fellows and research visitors, and guided and co-guided 118 graduate students (72 Ph.D. and 46 M.S. students).
Dr. Reddy is known worldwide for his significant contributions to the field of applied mechanics through the authorship of widely used textbooks on the linear and nonlinear finite element analysis, variational methods, and composite materials and structures. His pioneering works on the development of shear deformation theories (that bear his name in the literature as the Reddy third-order plate theory and the Reddy layerwise theory) have had a major impact and have led to new research developments and applications. Some of the ideas on shear deformation theories and penalty finite element models of fluid flows have been implemented into commercial finite element computer programs like ABAQUS, NISA, and HyperXtrude. In recent years, Reddy's research deals with 7-, 8-, and 12-parameter shell theories, nonlocal and non-classical continuum mechanics problems, and problems involving couple stresses, surface stress effects, and discrete fracture and flow.
Dr. Reddy is the recipient of numerous professional awards from various professional organizations and societies, Recent significant national and international awards include: member of the US National Academy of Engineering, and foreign member of the Indian National Academy of Engineering, Canadian Academy of Engineering, Brazilian National Academy of Engineering, the Royal Academy of Engineering of Spain, the Chinese Academy of Engineering, and the European Academy of Sciences. also received the John von Neumann Medal from the US Association of Computational Mechanics, the Theodore von Karman Medal from the American Society of Civil Engineers, and the Stephan P. Timoshenko Medal from American Society of Mechanical Engineers.
撰稿人:吴凡
校对:李权威
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