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国家自然科学基金(10472089)

作品数:2 被引量:11H指数:2
相关作者:田晓耕沈亚鹏樊志新更多>>
相关机构:西安交通大学更多>>
发文基金:国家自然科学基金教育部“新世纪优秀人才支持计划”国家重点基础研究发展计划更多>>
相关领域:理学更多>>

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广义压电热弹性问题研究
基于Fourier热传导定律的经典热弹性理论中热控制方程是抛物型方程,因此所预测热在介质中以无限大速度传播。但在时间非常短的情形下,实验表明热是以有限的速度传播的[1]。因此,人们采用不同方法对经典热弹性理论进行改进,力...
田晓耕沈亚鹏
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金属薄膜短脉冲激光冲击热机耦合问题被引量:2
2009年
从电子-声子相互作用的双曲型两步热传导模型出发,考虑到金属体内晶格对热传导的影响,采用有限元法,直接在时间域中求解了金属薄膜内受短脉冲激光加热的二维热机耦合问题,避免了以往因电子-声子能量方程之间的耦合关系给二维热响应问题解析求解带来的困难,提高了用数值反变换工作时计算的精度,减少了工作量,得到了金属薄膜内二维热机耦合问题的温度、位移和应力的变化规律。
樊志新田晓耕沈亚鹏
关键词:金属薄膜温度
Study on generalized magneto-thermoelastic problems by FEM in time domain被引量:10
2005年
This paper presents an investigation of temperature, displacement, stress, and induced magnetic field in a half space perfectly-conductive plate. Finite element equations regarding generalized magneto-thermoelasticity problems with two relaxation times (i.e., the G-L theory) are derived using the principle of virtual work. For avoiding numerical complication involved in inverse Laplace and Fourier transformation and low precision thereof, the equations are solved directly in time-domain. As a numerical example, the derived equation is used to investigate the generalized magneto-thermoelastic behavior of a semi-infinite plate under magnetic field and subjecting to a thermal shock loading. The results demonstrate that FEM can faithfully predict the deformation of the plate and the induced magnetic field, and most importantly can reveal the sophisticated second sound effect of heat conduction in two-dimensional generalized thermoelastic solids, which is usually difficult to model by routine transformation methods. A peak can be observed in the distribution of stress and induced front and the magnitude of magnetic field at the heat wave the peak decreases with time, which can not be obtained by transformation methods. The new method can also be used to study generalized piezo-thermoelastic problems.
Xiaogeng Tian Yapeng Shen
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