Development and Application of Fatigue Life Evaluation Software LtsFatigue Based on LiToSim
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摘要:
针对结构的疲劳问题，考虑随机载荷作用，在自主开发的LiToSim平台基础上，嵌入结构疲劳分析数值计算程序。基于LiToSim平台开发LtsFatigue疲劳软件，运用时域疲劳算法，通过雨流计数法对应力时程曲线处理并计算结构疲劳寿命；引入频域疲劳算法，基于应力响应功率谱根据应力循环分布估算疲劳寿命；通过齿轮算例进行疲劳分析，与商业软件对比，验证了LtsFatigue定制化疲劳软件时域法、频域法的计算精度，同时，频域算法有效提高了计算效率，凸显了LtsFatigue软件的优势。基于LiToSim平台的LtsFatigue定制化疲劳软件开发，对大型复杂结构的疲劳仿真具有重要的应用价值。
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关键词:
- 定制化疲劳软件LtsFatigue /
- LiToSim平台 /
- 结构疲劳 /
- 随机载荷
Abstract:For the fatigue problem of structures under random loads, the numerical calculation program for structural fatigue analysis was embedded into the self-developed LiToSim platform. Based on the LiToSim platform, fatigue software LtsFatigue was developed, and the structure fatigue life was calculated by means of the time domain fatigue algorithm, where the stress time history was processed and calculated with the rainflow counting method. The frequency domain fatigue algorithm was introduced to estimate the fatigue life based on the stress response power spectrum and the distribution of stress cycles. The comparison through the gear example with the commercial software verifies the calculation accuracy of the time domain and frequency domain methods of the LtsFatigue customized fatigue software. The frequency domain algorithm has greatly improved computational efficiency, and highlights the advantages of the LtsFatigue software. The development of the LtsFatigue customized software based on the LiToSim platform has significant application value for fatigue simulations of large complex structures.
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Key words:
- LtsFatigue software /
- LiToSim platform /
- structural fatigue /
- random load
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图 3 基于LiToSim的定制化疲劳软件LtsFatigue组织结构图
注 为了解释图中的颜色，读者可以参考本文的电子网页版本，后同。
Figure 3. The organizational structure of the LiToSim software fatigue module (LtsFatigue)
图 4 基于LiToSim的定制化疲劳软件LtsFatigue界面
Figure 4. The interface for customized software LtsFatigue based on LiToSim
图 7 基于LiToSim的定制化疲劳软件LtsFatigue分析流程
Figure 7. The analysis process of customized software LtsFatigue based on LiToSim
图 9 有限元分析结果，第一主应力对比：（a） LiToSim有限元分析结果，第一主应力；（b） ABAQUS有限元结果分析结果，第一主应力
Figure 9. For finite element analysis (FEA) results, the comparison of the 1st principal stress: (a) LiToSim FEA results; (b) ABAQUS FEA results
图 11 LtsFatigue与Fe-safe时域疲劳寿命对比：（a） LtsFatigue疲劳寿命结果，时域法；（b） Fe-safe疲劳寿命结果，时域法
Figure 11. Comparison of the fatigue life between LtsFatigue and ABAQUS/Fe-safe time domain: (a) the LtsFatigue fatigue life-time domain; (b) the Fe-safe fatigue life-time domain
图 12 LtsFatigue时域与频域疲劳寿命：（a） 时域法；（b） 频域法
Figure 12. LtsFatigue time domain and frequency domain fatigue lives: (a) the fatigue life-time domain; (b) the fatigue life-frequency domain
表 1 应力响应统计特性
Table 1. Stress response statistical characteristics
Sm/ MPa σX/ MPa Sk Ku α2 node 9018 52.36 106.49 0.078 3.24 0.63 
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表 2 LtsFatigue与Fe-safe 计算精度和计算效率对比
Table 2. Comparison of computational accuracy and computational efficiency between LtsFatigue and Fe-safe
software method ${\rm{lg} }\;N_{\rm{f} }$ percentage difference ε/% calculation time t/s Fe-safe time domain 0.934 3 – 72.06 LtsFatigue time domain 0.938 1 0.41 75.57 LtsFatigue frequency domain 0.908 0 2.81 39.63
下载: 导出CSV
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