疲劳分析实例

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确认材料设置为结构钢 “Structural Steel”.
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Shape Finder
. . .作业A12 –过程
5. 点击环境 Environment 栏. 6. 点击连杆表面显示…
6. 5.
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– “RMB > Insert > Cylindrical Support” 10. 9.
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16.
17. RMB > Insert > Stress > Equivalent (von Mises).
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作业A12 – 结果
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点击并画出对于设计寿命为1e6的循环次数的安全系数 “Safety Factor”.
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27.插入 “Fatigue Sensitivity”(疲劳敏感性):
– RMB > Insert > Fatigue > Fatigue Sensitivity
27.
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从 Details of “Fatigue Sensitivity” 窗口:
28.定义一个最小基本载荷变化幅度为50% (一 28. 个2250N 的交互应力)和一个最大基本载荷 变化幅度为200% (一个 9000N的交互应力) .
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4.
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作业 A12
疲劳
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作业 A12 – 目标
• 目标:
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作业 A12– 结果
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点击并画出等效应力结果 “Equivalent Stress” .
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. . .作业14 –过程
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施加如下边界条件 (看下页):
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2. 在geometry 栏点击“Part 1”. 3. 如果不是,那么点击“Material”并“browse”.
2. 3.
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4. 选择 “Structural_Steel” 材料,然后点击 [Open].
. . .作业A12 –过程
22.
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23. 定义应力寿命疲劳分析(由于是全反载荷(fully reversed loading) 而不是平均应力,所以不需 23. 24. 要平均应力理论). 24. 定义Von Mises 应力以便和疲劳材料数据比较.
February 2, 2004 Inventory #002010 8-17
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– 目标在于完成一个连杆模型的疲劳分析(ConRod.x_t). 具体地,我们将分析两个 载荷环境(environments): 1) 4500 N的恒定振幅载荷 Fully Reversed ;2) 4500N的任意载荷.
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从Details of “Cylindrical Support” 窗口:
12. 设置 Radial=“Fixed”, Axial=“Free”, Tangential=“Free”
11.
12.
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Shape Finder
. . .作业A12 –过程
19.
20. RMB > Insert > Fatigue > Fatigue Tool.
20.
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作业A12 –求解设置
• 从 Details of “Fatigue Tool” 窗口: 21. 定义疲劳强度因子(Fatigue Strength Factor) (Kf) 为0 .8 (描述的材料数据表示光滑试件和在 役构件). 22. 定义对称循环载荷(fully reversed loading)以 21. 建立交互应力循环.
26. 设置设计寿命 Design Life 为1e6循环次数.
26.
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作业A12 – 求解设置
• 向 Fatigue Tool添加结果(续):
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15. 插入一个固定支撑.
– “RMB > Insert > Fixed Support”
15.
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作业A12– 求解设置
• 向solution(求解)添加结果: 16. 点击 solution 栏.
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February 2, 2004 Inventory #002010 8-12
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作业A12 –求解设置
• 向 Fatigue Tool添加结果: 25. 插入 “Safety Factor”(安全系数): – RMB > Insert > Fatigue > Safety Factor.
7. 插入一个力载荷.
– “RMB > Insert > Force”
8. 从detail窗口改成“Components” 并使 “Z = - 4500 N”.
7.
8.
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Shape Finder
. . .作业A12–过程
9. 点击环境栏Environment. 10. 点击连杆表面显示… 11. 插入一个圆柱壳支撑.
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作业A12 – 求解设置
• 向 Fatigue Tool添加结果(续) :
– RMB > Insert > Fatigue > Biaxiality Indication
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13. 点击环境栏Environment. 14. 点击连杆表面显示…
14. 13.
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29. 插入 “Biaxiality Indication”:
29.
Hale Waihona Puke •Solve(求解)
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作业A12– 结果
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•
点击并画出总体变形“Total Deformation”.
查看结果
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25.
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从 Details of “Safety Factor” 窗口:
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当 DS 启动后, 点击右上角 ‘X’ 关闭向导菜 单.
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作业A12 – 过程
• 改变单位为公制metric (m, kg, Pa …).
1. “Units > Metric (m, kg, Pa, C, s)” 1.
17.
18. RMB > Insert > Deformation > Total.
18.
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作业A12–求解设置
• 插入fatigue tool: 19. 点击 solution 栏.
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. . . 作业A12 – 起始页
• • 从发射台进入DS. 选择 “Geometry > From File . . . “ 打开文 件“ConRod.x_t”.
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