Nonlinear Dynamics of Structures with Material Degradation

Nonlinear Dynamics of Structures with Material Degradation
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材料降解结构的非线性动力学

DOI:
10.1088/1742-6596/744/1/012123
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发表时间:
2016
期刊:
Conference Series
影响因子:
--
通讯作者:
Soltani P
Soltani P
中科院分区:
--
文献类型:
--
作者:
Soltani P

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结构物在其使用寿命期间通常会发生劣化。氧化、腐蚀、紫外线暴露和热机械疲劳是导致降解的一些最知名的机制。这种现象在其使用寿命期间逐渐改变结构特性和动态行为,并且在存在非线性的情况下可能更具问题性和挑战性。在本文中,我们研究如何动态行为的非线性系统的变化,热环境引起某些参数的变化。为此,考虑并定义了简谐外力作用下的非线性集中质量模态模型。将根据经验测试数据制定的与温度相关的材料函数添加到模型中。使用这些函数,分叉参数的定义和相应的非线性响应观察的数值延拓。结果之间的比较给出了一个初步的洞察如何温度引起的性能影响的动态响应,并突出显示的结构的稳定性条件的变化。
Structures usually experience deterioration during their working life. Oxidation, corrosion, UV exposure, and thermo-mechanical fatigue are some of the most well-known mechanisms that cause degradation. The phenomenon gradually changes structural properties and dynamic behaviour over their lifetime, and can be more problematic and challenging in the presence of nonlinearity. In this paper, we study how the dynamic behaviour of a nonlinear system changes as the thermal environment causes certain parameters to vary. To this end, a nonlinear lumped mass modal model is considered and defined under harmonic external force. Temperature dependent material functions, formulated from empirical test data, are added into the model. Using these functions, bifurcation parameters are defined and the corresponding nonlinear responses are observed by numerical continuation. A comparison between the results gives a preliminary insight into how temperature induced properties affects the dynamic response and highlights changes in stability conditions of the structure.
具有滞后和退化的非线性结构系统的混沌和随机动力学
DOI: --
发表时间: 1991
期刊:
影响因子: --
作者:
C. Y. Yang;A. Cheng;R. Roy
通讯作者: R. Roy
耦合奇点的触发因素
DOI: --
发表时间: 2004
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DOI: --
发表时间: 2005
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