弹射动力装置结构强度可靠性研究

摘要

In this paper,based on the statistical analysis of experiment data,the probability model of gas pressure peak and material strength was established.The coupling between the thermal and mechanical loads was researehed,and the structural reliability model of the ejection launcher was established,and the structural reliability assessment was conducted according to the stress-intensity interference theory.The gas pressure peak was proved to be decoupled from the thermal load,and has a normal distribution while the confidence reached 99％.Contrasted to the structural reliability required,the former ejection launcher casing was "over-safe" designed and can be optimized to have 30％ weight reduced.%通过对大量试验数据的统计分析,建立了弹射动力装置燃气压力峰值和结构材料强度性能的概率分布模型,并分析了热-机械载荷的耦合性,基于应力-强度干涉理论建立了动力装置壳体结构强度的可靠性模型,开展了动力装置结构强度可靠性评估与优化分析.研究表明,弹射过程中动力装置弹射内压峰值与燃气热载荷不存在耦合关系,且内压峰值服从正态分布,置信度99％;原动力装置壳体存在“过安全”设计,基于结构强度可靠度指标优化后,可实现减重30％.