《ansys57线性和非线性结构静力分析指南》.doc

《ANSYS57线性和非线性结构静力分析指南》

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1  结构分析概述 _____________________________________________________________________ 6
1.1  结构分析定义__________________________________________________________________ 6
1.2  结构分析的类型________________________________________________________________ 6
1.3  结构分析所应用的单元__________________________________________________________ 6
1.4  材料模式界面__________________________________________________________________ 8
1.5  求解方法______________________________________________________________________ 8
2  结构线性静力分析 _________________________________________________________________ 9
2.1  静力分析的定义________________________________________________________________ 9
2.2  线性静力分析与非线性静力分析__________________________________________________ 9
2.3  静力分析的例子________________________________________________________________ 9
2.4  静力分析的求解步骤____________________________________________________________ 9
2.4.1  建模 ______________________________________________________________________ 9
2.4.2  设置求解控制 _____________________________________________________________ 10
2.4.3  设置其他求解选项 _________________________________________________________ 13
2.4.4  施加荷载 _________________________________________________________________ 14
2.4.5  求解 _____________________________________________________________________ 16
2.4.6  检查分析结果 _____________________________________________________________ 17
2.5  静力分析示例(GUI方法)________________________________________________________ 19
2.5.1  问题描述 _________________________________________________________________ 19
2.5.2  几何和材料特性 ___________________________________________________________ 19
2.5.3  求解 _____________________________________________________________________ 19
2.6  静力分析示例(命令流方法) _____________________________________________________ 27
2.7  何处找到更多的静力分析示例___________________________________________________ 29
7  屈曲分析 ________________________________________________________________________ 31
7.1  屈曲分析的概念_______________________________________________________________ 31
7.2  屈曲分析的类型_______________________________________________________________ 31
7.2.1  非线性屈曲分析 ___________________________________________________________ 31
7.2.2  特征值屈曲分析 ___________________________________________________________ 31
7.3  屈曲分析的用到的命令_________________________________________________________ 31
7.4  非线性屈曲分析的过程_________________________________________________________ 31
7.4.1  施加载荷增量 _____________________________________________________________ 32
7.4.2  自动时间步长功能 _________________________________________________________ 32
7.4.3  注意事项 _________________________________________________________________ 32
7.4.4  其他 _____________________________________________________________________ 32
7.5  特征值(线性)屈曲分析 _________________________________________________________ 33
7.5.1  建立模型 _________________________________________________________________ 33
7.5.2  获得静力解 _______________________________________________________________ 33
7.5.3  获得特征值屈曲解 _________________________________________________________ 34
7.5.4  扩展解 ___________________________________________________________________ 35
7.5.5  查看结果 _________________________________________________________________ 36

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ANSYS结构分析指南

7.6  特征值屈曲分析实例(GUI方法)__________________________________________________ 36
7.6.1  问题描述 _________________________________________________________________ 36
7.6.2  问题详细说明 _____________________________________________________________ 37
7.6.3  求解步骤 _________________________________________________________________ 37
7.7  屈曲分析示例(命令流方法) _____________________________________________________ 39
7.8  何处找到更多的示例___________________________________________________________ 40
8  非线性结构分析 __________________________________________________________________ 41
8.1  结构非线性的定义_____________________________________________________________ 41
8.1.1  非线性行为的原因 _________________________________________________________ 41
8.1.2  非线性分析的基本信息 _____________________________________________________ 42
8.2  几何非线性的应用_____________________________________________________________ 44
8.2.1  应力-应变_________________________________________________________________ 44
8.2.2  应力刚化 _________________________________________________________________ 45
8.2.3  旋转软化 _________________________________________________________________ 45
8.3  材料非线性的模拟_____________________________________________________________ 45
8.3.1  非线性材料 _______________________________________________________________ 45
8.4  在ANSYS中执行非线性分析 ____________________________________________________ 62
8.5  非线性静态分析步骤___________________________________________________________ 62
8.5.1  建模 _____________________________________________________________________ 62
8.5.2  设置求解控制 _____________________________________________________________ 62
8.5.3  设置附加求解选项 _________________________________________________________ 66
8.5.4  施加荷载 _________________________________________________________________ 68
8.5.5  求解 _____________________________________________________________________ 69
8.5.6  考察结果 _________________________________________________________________ 69
8.5.7  终止正在运行的工作,重起动 _________________________________________________ 71
8.6  非线性瞬态分析步骤___________________________________________________________ 71
§8.6.1  建模 ____________________________________________________________________ 71
§8.6.2  施加荷载和求解 __________________________________________________________ 71
§8.6.3  观察结果 ________________________________________________________________ 73
8.7  非线性瞬态分析示例(输入文件列表) _____________________________________________ 73
8.8  重启动_______________________________________________________________________ 74
8.9  非线性(状态改变)单元 _________________________________________________________ 74
§8.9.1  单元生死 ________________________________________________________________ 74
8.10  非线性分析的提示和指南 ______________________________________________________ 74
8.10.1 __________________________________________________________________________ 74
8.10.2  克服收敛问题 ____________________________________________________________ 75
8.11  非线性(静态)分析示例(GUI方法) _______________________________________________ 79
8.11.1  问题描述 ________________________________________________________________ 79
8.11.2  基本数据 ________________________________________________________________ 79
8.11.3  问题求解 ________________________________________________________________ 80
8.12  非线性(静态)分析示例(批处理方法) _____________________________________________ 84
8.13  其它例子 ____________________________________________________________________ 88
9  接触分析 ________________________________________________________________________ 90

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ANSYS结构分析指南

9.1  概述_________________________________________________________________________ 90
9.1.1  显式动态接触分析能力 _____________________________________________________ 90
9.2  一般接触分类_________________________________________________________________ 90
9.3 ANSYS接触分析功能 __________________________________________________________ 90
9.3.1  面─面的接触单元 _________________________________________________________ 91
9.3.2  点─面接触单元 ___________________________________________________________ 92
9.3.3  点─点接触单元 ___________________________________________________________ 92
9.4  面─面的接触分析_____________________________________________________________ 92
9.4.1  应用面-面接触单元_________________________________________________________ 92
9.4.2  接触分析的步骤 ___________________________________________________________ 93
9.4.3  建立模型几何实体和划分网格 _______________________________________________ 93
9.4.4  识别接触对 _______________________________________________________________ 93
9.4.5  指定接触面和目标面 _______________________________________________________ 94
9.4.6  不对称接触与对称接触 _____________________________________________________ 94
9.4.7  定义目标面 _______________________________________________________________ 94
9.4.8  定义柔体的接触面 _________________________________________________________ 98
9.4.9  设置实常数和单元关键字 __________________________________________________ 100
9.4.10  控制刚性目标面的运动(刚体-柔体接触) _____________________________________ 109
9.4.11  温度接触建模 ___________________________________________________________ 110
9.4.12  给变形体单元加必要的边界条件 ___________________________________________ 111
9.4.13  定义求解和载荷步选项 ___________________________________________________ 112
9.4.14  求解 ___________________________________________________________________ 113
9.4.15  检查结果 _______________________________________________________________ 113
9.5  点-面接触分析 _______________________________________________________________ 116
9.5.1  使用点─面的接触单元 ____________________________________________________ 116
9.5.2  点─面接触分析的步骤 ____________________________________________________ 116
9.6  点－点的接触分析____________________________________________________________ 127
§9.6.1  建立几何实体及分网 _____________________________________________________ 127
§9.6.2  生成接触单元 ___________________________________________________________ 128
§9.6.3  定义接触的法线方向 _____________________________________________________ 128
§9.6.4  定义初始界面或间隙 _____________________________________________________ 129
§9.6.5  选择接触算法 ___________________________________________________________ 129
§9.6.6  施加必要的边界条件 _____________________________________________________ 130
§9.6.7  定义求解选项 ___________________________________________________________ 130
§9.6.8  求解 ___________________________________________________________________ 131
§9.6.9  检查结果 _______________________________________________________________ 131