首页|螺纹紧固件拆装过程理论模型边界条件影响研究

螺纹紧固件拆装过程理论模型边界条件影响研究

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对于螺纹紧固件装配与拆卸过程的研究,扭拉关系和螺纹副轴向承载分布是两个重要的指标.二者均基于螺纹几何模型和受力平衡关系,发展出成熟的理论.在调研仿真或试验研究文献后,发现所获二者结果经常与理论解偏差较大,甚至不与理论解进行对比验证.通过改变参数计算后发现,一方面螺母施拧位置将影响螺母支承面接触压力分布,最终影响扭拉关系;另一方面螺母径向约束将影响螺纹副啮合状态,最终螺纹副轴向承载分布.为了节省此类研究在理论验证阶段的成本,本文借助ANSYS建立出两类螺母的精细化螺纹三维有限元模型,通过对比数值结果讨论这两方面的影响规律,给出建模边界条件的建议.
Research on Boundary Conditions Influence of Theoretical Model for Bolt Assembly and Disassembly Process
For the research of the assembly and disassembly process of threaded fasteners,the torsional relationship and the axial load distribution of threaded subsets are two important indexes.Both of them have developed mature theories based on thread geometry model and force balance relationship.After the investigation of simulation or experimental research literature,the results of the two indexes are often found deviate greatly from the theoretical solution,even there is no comparison between the results of then and the theoretical solution.Through the calculation of changing the parameters,on the one hand,the nut screwing position will affect the contact pressure distribution of the nut supporting surface,and finally affect the torsional relationship.On the other hand,the radial constraint of the nut will affect the meshing state of the thread pair,and affect the final axial bearing distribution of the thread pair.The purpose of this paper is to save the cost of this kind of research in the theoretical verification stage.For two kinds of nuts,the three-dimensional finite element model of fine thread is established by ANSYS.Then the influence law of these two aspects is discussed by comparing the numerical results.Finally,the suggestion of modeling boundary conditions is given.

fastener assembly and disassemblypreload-torque relationshipthread pair load distributiontheoretical model boundary requirementsfinite element simulation

沈超、李翔、刘钊、刘燕、刘超、刘才山

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天津市紧固连接技术重点实验室,天津 300300

航天精工股份有限公司,天津 300300

北京大学工学院,湍流与复杂系统国家重点实验室,北京 100871

中国兵器工业导航与控制技术研究所,北京 100871

中国航发四川燃气涡轮研究院,成都 610500

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紧固件装配与拆卸 扭拉关系 螺纹副承载分布 理论模型边界要求 有限元仿真

国家自然科学基金天津市紧固连接技术企业重点实验室开放课题

11932001TKLF2021-02-A-01

2024

10.19447/j.cnki.11-1773/v.2024.04.005

强度与环境
北京强度环境研究所

强度与环境

CSTPCD
影响因子：0.45
ISSN：1006-3919
年,卷(期)：2024.51(4)