"Plastic Instability Phenomena with Aspects of Chaos of Fixed-Edge Structures Subjected to Short Pulse Loading"

固定端梁受到短脉冲横向加载，从而施加塑性变形。由于末端的固定，可能会发生与浅拱作用有关的动力失稳。在均匀光束（通过有限元分析）和双自由度和单自由度特殊光束模型中研究了异常现象（如与脉冲方向相反的最终偏转和严重的预测困难）。在前两种情况下，确定性混沌的迹象出现了。它们的新奇和有趣之处在于它们的外表没有工作约束，也没有和谐或其他持续的激励。这里提出的研究旨在确认和扩大已经获得的初步结果（在提案中概述），通过进一步的分析和扩展获得更深入的理解，并提供估计可能发生的参数范围的方法。

A fixed ended beam is subjected to a short pulse of transverse loading such that plastic deformations are imposed. Because of the end fixity, dynamic instabilities related to shallow arch action may occur. Anomalous phenomena (such a final deflections in the direction opposite that of the pulse and severe difficulty of prediction) have been studied in uniform beams (by finite element analysis) and in two-and single-degree of freedom special beam models. In the first two of these cases, indications of deterministic chaos appear. Their novelty and interest lie in their appearance with workless constraints and in the absence of harmonic or other sustained excitation. Research is proposed here which aims to confirm and amplify the preliminary results already obtained (outlined in the proposal), to gain deeper understanding by further analysis and extensions, and to provide methods for the estimation of parameter ranges in which they are likely to occur.