《ANSYS57線性和非線性結(jié)構(gòu)靜力分析指南》

目
 

錄
 

1  結(jié)構(gòu)分析概述 _____________________________________________________________________ 6
1.1  結(jié)構(gòu)分析定義__________________________________________________________________ 6
1.2  結(jié)構(gòu)分析的類型________________________________________________________________ 6
1.3  結(jié)構(gòu)分析所應(yīng)用的單元__________________________________________________________ 6
1.4  材料模式界面__________________________________________________________________ 8
1.5  求解方法______________________________________________________________________ 8
2  結(jié)構(gòu)線性靜力分析 _________________________________________________________________ 9
2.1  靜力分析的定義________________________________________________________________ 9
2.2  線性靜力分析與非線性靜力分析__________________________________________________ 9
2.3  靜力分析的例子________________________________________________________________ 9
2.4  靜力分析的求解步驟____________________________________________________________ 9
2.4.1  建模 ______________________________________________________________________ 9
2.4.2  設(shè)置求解控制 _____________________________________________________________ 10
2.4.3  設(shè)置其他求解選項(xiàng) _________________________________________________________ 13
2.4.4  施加荷載 _________________________________________________________________ 14
2.4.5  求解 _____________________________________________________________________ 16
2.4.6  檢查分析結(jié)果 _____________________________________________________________ 17
2.5  靜力分析示例(GUI方法)________________________________________________________ 19
2.5.1  問題描述 _________________________________________________________________ 19
2.5.2  幾何和材料特性 ___________________________________________________________ 19
2.5.3  求解 _____________________________________________________________________ 19
2.6  靜力分析示例(命令流方法) _____________________________________________________ 27
2.7  何處找到更多的靜力分析示例___________________________________________________ 29
7  屈曲分析 ________________________________________________________________________ 31
7.1  屈曲分析的概念_______________________________________________________________ 31
7.2  屈曲分析的類型_______________________________________________________________ 31
7.2.1  非線性屈曲分析 ___________________________________________________________ 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  非線性屈曲分析的過程_________________________________________________________ 31
7.4.1  施加載荷增量 _____________________________________________________________ 32
7.4.2  自動時(shí)間步長功能 _________________________________________________________ 32
7.4.3  注意事項(xiàng) _________________________________________________________________ 32
7.4.4  其他 _____________________________________________________________________ 32
7.5  特征值(線性)屈曲分析 _________________________________________________________ 33
7.5.1  建立模型 _________________________________________________________________ 33
7.5.2  獲得靜力解 _______________________________________________________________ 33
7.5.3  獲得特征值屈曲解 _________________________________________________________ 34
7.5.4  擴(kuò)展解 ___________________________________________________________________ 35
7.5.5  查看結(jié)果 _________________________________________________________________ 36

3
 
 
ANSYS結(jié)構(gòu)分析指南

7.6  特征值屈曲分析實(shí)例(GUI方法)__________________________________________________ 36
7.6.1  問題描述 _________________________________________________________________ 36
7.6.2  問題詳細(xì)說明 _____________________________________________________________ 37
7.6.3  求解步驟 _________________________________________________________________ 37
7.7  屈曲分析示例(命令流方法) _____________________________________________________ 39
7.8  何處找到更多的示例___________________________________________________________ 40
8  非線性結(jié)構(gòu)分析 __________________________________________________________________ 41
8.1  結(jié)構(gòu)非線性的定義_____________________________________________________________ 41
8.1.1  非線性行為的原因 _________________________________________________________ 41
8.1.2  非線性分析的基本信息 _____________________________________________________ 42
8.2  幾何非線性的應(yīng)用_____________________________________________________________ 44
8.2.1  應(yīng)力-應(yīng)變_________________________________________________________________ 44
8.2.2  應(yīng)力剛化 _________________________________________________________________ 45
8.2.3  旋轉(zhuǎn)軟化 _________________________________________________________________ 45
8.3  材料非線性的模擬_____________________________________________________________ 45
8.3.1  非線性材料 _______________________________________________________________ 45
8.4  在ANSYS中執(zhí)行非線性分析 ____________________________________________________ 62
8.5  非線性靜態(tài)分析步驟___________________________________________________________ 62
8.5.1  建模 _____________________________________________________________________ 62
8.5.2  設(shè)置求解控制 _____________________________________________________________ 62
8.5.3  設(shè)置附加求解選項(xiàng) _________________________________________________________ 66
8.5.4  施加荷載 _________________________________________________________________ 68
8.5.5  求解 _____________________________________________________________________ 69
8.5.6  考察結(jié)果 _________________________________________________________________ 69
8.5.7  終止正在運(yùn)行的工作,重起動 _________________________________________________ 71
8.6  非線性瞬態(tài)分析步驟___________________________________________________________ 71
§8.6.1  建模 ____________________________________________________________________ 71
§8.6.2  施加荷載和求解 __________________________________________________________ 71
§8.6.3  觀察結(jié)果 ________________________________________________________________ 73
8.7  非線性瞬態(tài)分析示例(輸入文件列表) _____________________________________________ 73
8.8  重啟動_______________________________________________________________________ 74
8.9  非線性(狀態(tài)改變)單元 _________________________________________________________ 74
§8.9.1  單元生死 ________________________________________________________________ 74
8.10  非線性分析的提示和指南 ______________________________________________________ 74
8.10.1 __________________________________________________________________________ 74
8.10.2  克服收斂問題 ____________________________________________________________ 75
8.11  非線性(靜態(tài))分析示例(GUI方法) _______________________________________________ 79
8.11.1  問題描述 ________________________________________________________________ 79
8.11.2  基本數(shù)據(jù) ________________________________________________________________ 79
8.11.3  問題求解 ________________________________________________________________ 80
8.12  非線性(靜態(tài))分析示例(批處理方法) _____________________________________________ 84
8.13  其它例子 ____________________________________________________________________ 88
9  接觸分析 ________________________________________________________________________ 90

4
 
ANSYS結(jié)構(gòu)分析指南

9.1  概述_________________________________________________________________________ 90
9.1.1  顯式動態(tài)接觸分析能力 _____________________________________________________ 90
9.2  一般接觸分類_________________________________________________________________ 90
9.3 ANSYS接觸分析功能 __________________________________________________________ 90
9.3.1  面─面的接觸單元 _________________________________________________________ 91
9.3.2  點(diǎn)─面接觸單元 ___________________________________________________________ 92
9.3.3  點(diǎn)─點(diǎn)接觸單元 ___________________________________________________________ 92
9.4  面─面的接觸分析_____________________________________________________________ 92
9.4.1  應(yīng)用面-面接觸單元_________________________________________________________ 92
9.4.2  接觸分析的步驟 ___________________________________________________________ 93
9.4.3  建立模型幾何實(shí)體和劃分網(wǎng)格 _______________________________________________ 93
9.4.4  識別接觸對 _______________________________________________________________ 93
9.4.5  指定接觸面和目標(biāo)面 _______________________________________________________ 94
9.4.6  不對稱接觸與對稱接觸 _____________________________________________________ 94
9.4.7  定義目標(biāo)面 _______________________________________________________________ 94
9.4.8  定義柔體的接觸面 _________________________________________________________ 98
9.4.9  設(shè)置實(shí)常數(shù)和單元關(guān)鍵字 __________________________________________________ 100
9.4.10  控制剛性目標(biāo)面的運(yùn)動(剛體-柔體接觸) _____________________________________ 109
9.4.11  溫度接觸建模 ___________________________________________________________ 110
9.4.12  給變形體單元加必要的邊界條件 ___________________________________________ 111
9.4.13  定義求解和載荷步選項(xiàng) ___________________________________________________ 112
9.4.14  求解 ___________________________________________________________________ 113
9.4.15  檢查結(jié)果 _______________________________________________________________ 113
9.5  點(diǎn)-面接觸分析 _______________________________________________________________ 116
9.5.1  使用點(diǎn)─面的接觸單元 ____________________________________________________ 116
9.5.2  點(diǎn)─面接觸分析的步驟 ____________________________________________________ 116
9.6  點(diǎn)－點(diǎn)的接觸分析____________________________________________________________ 127
§9.6.1  建立幾何實(shí)體及分網(wǎng) _____________________________________________________ 127
§9.6.2  生成接觸單元 ___________________________________________________________ 128
§9.6.3  定義接觸的法線方向 _____________________________________________________ 128
§9.6.4  定義初始界面或間隙 _____________________________________________________ 129
§9.6.5  選擇接觸算法 ___________________________________________________________ 129
§9.6.6  施加必要的邊界條件 _____________________________________________________ 130
§9.6.7  定義求解選項(xiàng) ___________________________________________________________ 130
§9.6.8  求解 ___________________________________________________________________ 131
§9.6.9  檢查結(jié)果 _______________________________________________________________ 131