共查询到20条相似文献，搜索用时 9 毫秒
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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. 相似文献
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《力学快报》2020,10(1):1-7
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. 相似文献
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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 For strong coupling problems, the methods based on small parameter expansion are no longer applicable.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]. 相似文献
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L. P. Khoroshun 《International Applied Mechanics》1994,30(11):827-833
S. P. Timoshenko Institute of Mechanics, National Academy of Sciences of Ukraine, Kiev. Translated from Prikladnaya Mekhanika, Vol. 30, No. 11, pp. 3–9, November, 1994. 相似文献
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