我与《力学与实践》

《力学与实践》是1979年2月创刊的．1978年我收到了中国力学学会筹备杂志创刊的约稿信，就以当时所进行的胶片涂布科研工作为背景，用我1977年底在厦门召开的一次全国会议上的报告稿为基础，写了一篇综述文章“具有物理．化学反应的薄膜流体力学”寄给《力学与实践》．1978年10月正在上海无线电13厂接收、检验DJS-21电子计     

普及是科学的目的和归宿——纪念《力学与实践》创刊30年

1953年在南京市第八中学上高中时,我读了一本关于航空的科普译著小册子,所说飞机为什么能飞的道理,激发了我对流体力学的兴趣.为学习流体力学, 1954年我考入了北京大学数学力学系.所以,我是在科学普及著作的影响下,进入力学学习和工作的.     

关于牛顿力学的力和拉格朗日力学的力------理论力学札记之九

讨论了牛顿力学和拉格朗日力学中的力. 在牛顿力学中着重讨论了主动力, 约束和理想约束力. 在拉格朗日力学中着重讨论了广义力的两种分解方法.     

Extreme mechanics

With the development of cutting-edge sciences and new technologies, we have to consider the size, the density, the hardness, the stiffness and other properties of engineering materials and structures beyond the conventional ranges, as well as their mechanical behavior in extreme environments, such as ultra-conventional temperature, speed, physical and chemical fields, and severe weather, and more effective theories and methods of mechanics are required. This paper first gives the fundamental definition and the scientific connotation of extreme mechanics, then reviews the studies of extreme mechanics from three aspects: the extreme properties, the extreme loads, and the discipline development, as well as major engineering and scientific challenges. The characteristics of extreme mechanics and major challenges in the aspects of mechanical theory,computational methods and experimental techniques are discussed. Prospectivei developments of extreme mechanics are suggested.     

Multiscale mechanics

正Multiscale mechanics is about multi-scale correlation and strong coupling between scales, which widely exists in engineering applications with a broad range of spatial and temporal scales. The averaging method and the perturbation method have been employed in the past to deal with weak coupling problems. For strong coupling problems, the methods based on small parameter expansion are no longer applicable. Fluid turbulence and solid failure are two typical cases in nonlinear mechanics [1–3].