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疲劳分析学习笔记

  • 2026-01-11 05:24:26
疲劳分析学习笔记
一、疲劳分析基础
    如果机构处于不断加载和卸载的变动过程中,即使物体所承受的应力在许可范围内,也会遭到破坏,这个现象称为疲劳。
    疲劳现象的发现将设计理念由材料极限强度判定准则向疲劳失效判定准则转变,随着疲劳研究的深入及实验数据的积累,产品设计由无限疲劳寿命向有限疲劳寿命转变。
(1)疲劳载荷的类型
①等幅载荷
②变福载荷(载荷谱)
(2)S-N曲线
(对数图)
如应力在60MPa,则物体在使用100000次后就会断裂。
即不同应力状态下的寿命曲线。
这个图的获取方式只有做实验或者供应商获取,较难获取。
①低周主要描述屈服点以上的疲劳(一般<10000)
②高周主要描述屈服点以下的疲劳(一般>10000)
③小于屈服强度的1/3可认为产品处于无限疲劳状态(行业经验)
(3)案例
带孔矩形板一侧面均布110000N荷载,另一侧固定,考察结构在当前工况下能够承受的疲劳次数
做疲劳分析前需要先做一次对应的静应力分析,才可以在疲劳分析中选择相应的事件:
负载类型的解释:
①在事件中指定数量的循环期间,参考算例中的所有载荷(以及应力分量)将同时反转它们的方向。完全反转 (LR=-1):
②所有载荷(以及应力分量)按参考算例指定的方式将自己的量按比例从最大值变化至零。基于零 (LR = 0):
③每个载荷(以及每个应力分量)按比例将自己的量从最大值 (Smax) 变为由 R*Smax 定义的最小值(其中 R 是载荷比率)。 负比率表示反转载荷方向加载比率:
S-N曲线的获取:
solidworks里面有基于奥氏体刚曲线的派生方法:
结果解读:
损坏结果-代表循环1000次有0.19%的损坏。
(1000/5.144E5=0.19%,1000为循环次数,5.144E5为生命计算结果)
生命结果-代表最弱的地方可以承受5.1E5次以后开始产生裂纹
二、疲劳分析中的几个重要概念
(1)恒定振幅疲劳事件的几个概念
①平均应力:
②应力幅:
③应力比率:
而在S-N曲线中,S代表的是应力幅
案例:带孔矩形板一侧面固定,另一侧依次施加循环载荷220000N,2000次/循环载荷110000N,100000次/循环载荷55000N,200000次.
计算结果对比:
计算结果符合S-N曲线
三、复杂荷载疲劳及雨流计数法
案例:带孔矩形板一侧面均布基础荷载100N,读取软件自带的SAE transmission载荷谱,考察结构能够承受的疲劳次数
(1)雨流计数法和雨流计数箱
雨流计数法的详细知识需要了解的可以观看b站此up主的视频:https://www.bilibili.com/video/BV1Ha41137yt/?spm_id_from=333.337.search-card.all.click&vd_source=87fc83c9857b5b255d98d6a1925f49dd
雨流计数法:材料在变幅载荷下的疲劳损伤,主要取决于载荷的幅值和均值。一个杂乱无章的载荷信号无法直接用于计算。雨流计数法就像一台“循环提取机”,它能从这个混乱的信号中,识别出哪些上升和下降构成了一个完整的、可以计算损伤的循环。
雨流计数箱雨流技术箱是雨流计数法结果的一种统计处理和可视化工具。它本质上是一个二维矩阵或表格,将提取出的所有循环按照它们的均值和幅值进行分类计数。
四、振动疲劳
理论上只要能够得出应力的模块,都能够进行疲劳计算。
五、疲劳分析应用的思考
疲劳寿命的评价应包含两个参数,应力幅和平均应力。
(1)simulation中平均应力的纠正:
通常不用纠正。
(2)疲劳强度缩放因子
实际产品在生产过程中,材料的寿命会受到诸多因素的影响,如零件方面:应力集中程度;工作条件方面;材料方面等。综合以上因素考虑,即为影响零件疲劳强度的综合影响因子,也成为疲劳强度缩放因子。
(3)疲劳分析困难的原因
①疲劳实验的离散程度很高
②疲劳的相关参数获取困难,包括:S-N曲线、疲劳缩放因子
③理论体系不完善

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  1. CONNECT:[ UseTime:0.000548s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000739s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.100769s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.100855s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000891s ]
  6. SELECT * FROM `set` [ RunTime:0.100738s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000780s ]
  8. SELECT * FROM `article` WHERE `id` = 458635 LIMIT 1 [ RunTime:0.100865s ]
  9. UPDATE `article` SET `lasttime` = 1768164083 WHERE `id` = 458635 [ RunTime:0.079105s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.019785s ]
  11. SELECT * FROM `article` WHERE `id` < 458635 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.025208s ]
  12. SELECT * FROM `article` WHERE `id` > 458635 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.016273s ]
  13. SELECT * FROM `article` WHERE `id` < 458635 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.053907s ]
  14. SELECT * FROM `article` WHERE `id` < 458635 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.028416s ]
  15. SELECT * FROM `article` WHERE `id` < 458635 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.012831s ]
0.721102s