| 非傅里叶热弹性的时域间断迦辽金有限元方法 |
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| 引用本文： | 郭攀,武文华,吴志刚.非傅里叶热弹性的时域间断迦辽金有限元方法[J].力学学报,2013,45(3):447. |
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| 作者姓名： | 郭攀 武文华 吴志刚 |
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| 作者单位： | 1. 大连理工大学运载工程与力学学部工程力学系, 工业装备结构分析国家重点实验室, 大连116024;
2. 大连理工大学运载工程与力学学部航空航天学院, 工业装备结构分析国家重点实验室, 大连116024 |
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| 基金项目： | 国家重点基础研究发展规划，国家重大专项，创新研究群体研究基金(50921001)资助项目.The project was supported by the National Basic Research Program of China，National Science and Technology Major Project of the Ministry of Science and Technology of China，Innovation Research Group Research Fund |
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| 摘 要： | 基于Lord-Shulman非傅里叶热弹性模型,提出了采用修正的时域间断迦辽金有限元方法(time discontinuousGalerkin finite element method, DGFEM)求解方法. DGFEM对温度场、位移场基本未知向量及其时间导数向量在时域中分别插值;在最终的求解公式中,引入了人工阻尼. 数值结果显示所发展的DGFEM 较好地捕捉了波的间断并消除了热冲击作用下虚假的数值振荡,能够良好地模拟热弹性问题并具有较高的精度.
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| 关 键 词： | 广义热弹性 时域间断迦辽金有限元方法 热冲击 数值振荡 |
| 收稿时间： | 2012-12-06 |
| 修稿时间： | 2013-02-26 |
TIME DISCONTINUOUS GALERKIN FINITE ELEMENT METHOD FOR GENERALIZED THERMO-ELASTIC WAVE OF NON-FOURIER EFFECTS |
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| Guo Pan,Wu Wenhua,Wu Zhigang.TIME DISCONTINUOUS GALERKIN FINITE ELEMENT METHOD FOR GENERALIZED THERMO-ELASTIC WAVE OF NON-FOURIER EFFECTS[J].chinese journal of theoretical and applied mechanics,2013,45(3):447. |
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| Authors: | Guo Pan Wu Wenhua Wu Zhigang |
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| Institution: | 1. The State Key Laboratory for Structural Analysis of Industrial Equipment, Department of Engineering Mechanics, Faculty of Vehicle Engineering and Mechanics, Dalian University of Technology, Dalian 116024, China;
2. The State Key Laboratory for Structural Analysis of Industrial Equipment, School of Aeronautics and Astronautics, Faculty of Vehicle Engineering and Mechanics, Dalian University of Technology, Dalian 116024, China |
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| Abstract: | In the paper, we present a modified time discontinuous Galerkin finite element method (DGFEM) for the solution of generalized thermo-elastic coupled problems based on well-known non-Fourier Lord-Shulman theory. The general temperature and displacement fields with their time derivatives are interpolated in time domain, respectively. In order to filter out the spurious wave-front oscillations, an artificial damping scheme is implementation in the final finite element formula. Numerical results show that the present modified DGFEM proposes the good abilities and provides much more accurate solutions for generalized thermo-elastic coupled behavior. It can effectively capture the discontinuities at the wave front and filter out the effects of spurious numerical oscillation induced by thermal shock. |
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| Keywords: | generalized thermo-elastic theory DGFEM thermal shock numerical oscillation |
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