基于结构损伤模型的疲劳寿命与可靠性计算高精求解方法

The high precision solution of the structure fatigue life and the structure reliability involves the fatigue load spectrum technology, damage model, reliability design mathematical model and solving method. However, due to the fatigue damage model research in continuous improvement, the acquisition of load spectrum data in fatigue test restricted by the objective conditions, and the single reliability solution model, the accuracy of the calculated results of the fatigue life and reliability is under the technical bottleneck, which caused the safety hidden trouble in actual work and production .This project carries out scientific research on the high precision solutions of fatigue life and reliability, and try to make a theoretical breakthrough on the solution model and the algorithm. The main research work includes the virtual load spectrum technology, the effective improvement of fatigue damage model, the advanced reliability model and algorithm, and the development of software integration platform for the whole research work, etc. The research, with the typical parts of automobile suspension system as the application object, develops the study on virtual prototype simulation analysis and fatigue life test based on physical prototype, compares and verifies the analysis result, in order to provide theoretical support for the stability of the system and realize the robust optimization of structural part design. The completion of the project will make the prediction for fatigue life and the reliability of the results more accurate and reliable under the engineering application background.

结构疲劳寿命与可靠性的高精求解涉及到疲劳载荷谱技术、损伤模型、可靠性设计数学模型以及求解方法。然而，由于疲劳损伤模型的研究仍在不断完善之中、疲劳试验的载荷谱数据获取也受到了客观条件的制约、可靠度求解模型单一等因素的存在，从而使得疲劳寿命与可靠性计算结果的准确性遭遇到技术瓶颈，客观上造成了实际工作生产的安全隐患。本项目将对疲劳寿命与可靠性的高精求解方法开展科学研究，力争在求解模型与算法的理论层面上取得突破。主要研究工作包括虚拟载荷谱技术、疲劳损伤模型的有效改进、先进的可靠度模型与求解算法、以及整个研究工作的软件集成系统平台开发等。研究成果拟选取汽车悬架系统的典型部件作为应用对象，开展虚拟样机仿真分析与物理样机的疲劳寿命试验，并进行比较与验证，为系统工作的稳定可靠性提供理论支持，同时实现结构零部件设计的稳健优化。项目完成将使疲劳寿命预测与可靠性的求解结果更加准确、可信，具有工程应用背景。

结构疲劳寿命与可靠性的高精求解涉及到疲劳载荷谱技术、损伤模型、可靠性设计数学模型以及求解方法。然而，由于疲劳损伤模型的研究仍在不断完善之中、疲劳试验的载荷谱数据获取也受到了客观条件的制约、可靠度求解模型单一等因素的存在，从而使得疲劳寿命与可靠性计算结果的准确性遭遇到技术瓶颈，客观上造成了实际工作生产的安全隐患。本项目已经完成对疲劳寿命与可靠性的高精求解方法的科学研究，在求解模型与算法的理论层面上取得了初步进展，后续工作尚需进一步深入。主要研究工作包括虚拟载荷谱技术、疲劳损伤模型的有效改进、先进的可靠度模型与求解算法、以及整个研究工作的软件集成系统平台开发等。试验研究选取汽车悬架系统的板簧零件、木工GH50减速机作为对象，开展虚拟样机仿真分析与物理样机的疲劳寿命试验，并进行比较与验证，为系统工作的稳定可靠性提供了理论支持，同时完成了结构设计的稳健优化。项目研究完成将使疲劳寿命预测与可靠性的求解结果更加准确、可信，具有工程应用背景。