考虑材料性能温度效应下厚壁管道温度场和热应力有限元设计和计算
关键词 热应力 温度场 有限元法
毕业论文设计论文外文摘要
Title Considering the material properties of temperature effects, finite element design and calculation of thick pipe’s temperature field and thermal stress . Abstract
When the temperature changes, since the composition of each part of the mutual constraint external and internal constraints between the objects can not be completely free expansion and contraction, thus producing corresponding stress, which we call the thermal stress, also known as variable temperature stress. To determine the temperature, displacement, strain and stress fields, we can get to solve the thermal stress. In many important sectors, such as petrochemicals, power, nuclear energy, there are a lot of structures and components due to the work under variable temperature conditions, often there is a temperature stress problems. And the pipe in use, due to the temperature difference between inside and outside, often have a certain thermal stress cracking is one of the main pipeline, so use the appropriate means to determine the thermal stress pipeline is of great significance. To calculate the steady-state temperature stress must first determine the steady-state temperature field. Due to the shape of the structure and complexity of variable temperature conditions, relying on traditional analytical methods to accurately determine the temperature field is often impossible, finite element method is convenient and effective tool to solve these problems.
Keywords thermal stress temperature field finite element method
目 次
1 引言1
1.1 有限元法的发展现状1
1.2 热分析的国内外研究现状1
1.3 主要研究内容2
2 理论分析4
2.1 温度场和热传导的基本概念4
2.2 热传导问题的基本概念4
2.3 热应力基本算法9
3 ANSYS建模及分析10
4 FORTRAN编程算法实现16
4.1温度场算法实现16
4.2热应力算法实现21
结论 23
致谢 29
参考文献 30
1 引言
1.1 有限元法的发展现状
作为计算力学中的一种重要的方法，有限元法约在二十世纪五吹冰十年代兴起，在有限元法兴起之初，主要是在工程技术当中得到应用，有限元法能够很好的模拟和解决一系列物理问题，如工程力学、热学、电磁学等。有限元法刚面世时主要是应用于求解平面的结构问题，发展至今，有限元法已经不单单能解决二文问题了，它领域已经扩展到三文问题、板壳问题，从起初只能解决静力学问题，到现在解决动力学问题、稳定性问题，从起初只能解决结构力学问题，到现在解决流体力学、电磁学、传热学等学科的问题，从起初只能解决线性问题，到现在能解决非线性问题，从一开始的弹性材料到现在的弹塑性材料、塑性材料、粘弹性材料以及复合材料，从起初的航空领域到目前的航天工程、土木工程、机械制造、水利工程、造船、电子技术和原子能等各个领域，由一开始的单一物理场一直到现如今的多物理场的耦合。不论是有限元法应用的广度或者是深度都已经远非过去可比。
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