基于应力–强度干涉模型的分离螺母可靠性分析

目的 提出一种基于应力强度干涉模型的分离螺母的分离可靠性分析方法。方法 首先，建立分离螺母机构分离动力学模型和极限状态函数。然后，在考虑工作载荷、几何尺寸和药剂燃烧参数等参数不确定性的基础上，建立分离螺母不同分离阶段的基于应力–强度干涉模型的可靠性模型。最后，对分离螺母进行可靠性和灵敏度分析，量化工作载荷、几何尺寸和火药燃烧参数对分离螺母机构分离可靠性的重要性排序。结果 影响可靠性的主要参数依次为火药力、装药密度和预紧力。结论 该方法能够准确描述不确定性因素对分离螺母分离过程可靠性的影响，提升分离螺母机构分离可靠性定量分析的精度和效率，可为分离螺母的精细化设计提供支撑。

Reliability of Separation Nuts Based on Stress-Intensity Interference Model

The work aims to proposea method for reliability analysis of separation nuts based on stress-intensity interference model. Firstly, a separation dynamics model of the separation nut mechanism was established. Then, based on considering the uncertainty of parameters such as working load, geometric size and propellant combustion parameters, a reliability model based on stress-intensity interference model for different separation stages of the separation nuts was established. Finally, the reliability and sensitivity of the separation nuts were analyzed, and the importance of the working load, geometric size and gunpowder combustion parameters on the separation reliability of the separation nut mechanism was quantified. The most important parameters affecting the reliability were powder force, charge density and preload. The example shows that the method can accurately describe the effects of uncertain factors on the reliability of separation nuts during separation, improve the accuracy and efficiency of the quantitative analysis on the separation reliability of the separation nut mechanism, and provide support for fine design of separation nuts.