船用加筋板残余应力有限元分析
毕业论文关键词：极限强度；非线性有限元分析；加筋板；残余应力；ANSYS
Abstract With the large-scale development of modern ships, the strength of the hull structure has been highlighted. And the whole society pay more and more attention to the life and the environment making ship security position was on an unprecedented level. Stiffened plate is the basic structure of the ship, in the shipbuilding process there are a large number of the stiffened plate processing, which will produce some structure complex residual stresses in a stiffened plate, make the structural strength and toughness decreases. To reflect the true state of the stiffened plate and in checking its ultimate bearing capacity, taking into account influence of residual stresses is necessary. In this paper，by using nonlinear finite element software ANSYS to analysis the residual stress effect on ultimate strength of stiffened plates, The residual stress is loaded into the stiffened plate structure by the form of the residual stress. the main analysis of hot rolling residual stress and welding residual stress of two kinds of forms, and consider the trend of the ultimate strength in different grid size containing residual strength of stiffened panels under axial pressure. Results showed that the residual stress has significant effect on ultimate strength of stiffened plates, But the difference in the size of the grid has little effect on it.
Keywords: ultimate strength; nonlinear finite element analysis; Stiffened plate；residual stress；ANSYS
目录
摘要.VI
Abstract..VII
第1章绪论1
1.1选题的背景及意义..1
1.2.1残余应力研究现状2
1.2.2船舶结构极限强度研究现状..4
第2章有限元基本理论..7
2.1有限元分析..7
2.1.1有限单元法7
2.1.2Ansys有限元分析软件简介.8
2.1.3ANSYS典型分析的基本过程.9
2.2残余应力在ANSYS中的实现10
2.2.1残余应力的产生..10
2.2.2残余应力对钢构件的影响.10
2.2.3残余应力分布形式及在ANSYS中的模拟..11
第3章含残余应力的加筋板模型的建立.12
3.1计算模型的建立.12
3.1.1模型的基本参数..12
3.1.2建模过程..13
3.2残余应力的模拟.16
3.2.1热轧残余应力17
3.2.2焊接残余应力18
3.3焊接热分析19
3.3.1焊接热分析特点..19
3.3.2焊接热分析结果..20
3.5结果分析.28
第4章含残余应力加筋板的极限强度分析..29
4.1热轧残余应力的计算..29
4.2焊接残余应力的计算..33
4.3本章小结.37
总结与展望..38