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我们知道,很多年以前人们就研究过非线性问题。但是,世界上第一个明确提出非线性问题的是钱学森的老师von Kármán。1940年,von Kármán在美国航空科学年会上作了一个报告。这个报告后来发表在美国数学学会会报上,引起了人们对非线性问题的注意。他指出:“现在力学的最大缺陷是仅仅停留在线性化的基础上,而工程实际需要非线性理论。”von Karman兼长流体力学和固体力学,他全面衡量了两个学科领域的状况,提出了一些当时看来难以解决的非线性问题。他的讲话使Friedrichs搁下数学,用整整20年的时间去研究薄板大挠度问题;也促使RiViliu因此去研究非线性材料的有限变形问题,这是非线性力学的开始。从此,力学工作者不断地向非线性力学进军。
We know that people studied non-linear problems many years ago. However, von Kármán, the teacher of Qian Xuesen, was the first person in the world to explicitly raise the issue of non-linearity. In 1940 von Kármán made a report at the annual meeting of the American Society of Aeronautics. The report was later published in the American Mathematical Society Journal, arousing people’s attention to nonlinear problems. He pointed out: “Nowadays, the biggest limitation of mechanics is that it only stays on the basis of linearization, and the engineering actually needs nonlinear theory.” Von Karman, a dual fluid dynamics and solid mechanics, comprehensively measured the status of two disciplines and put forward Some non-linear problems that seemed hard to solve then. His speech left Friedrichs with mathematics and spent a full 20 years studying the large deflection problem of thin slabs. It also led RiViliu to study the finite deformation of nonlinear materials, which was the beginning of nonlinear mechanics. Since then, mechanics continue to non-linear mechanics into.