影响螺纹副轴向力分布均匀性的关键因素分析

发布时间：2018-01-20 04:21

本文关键词： 螺纹连接承载分布均匀性施必牢螺纹有限元分析　出处：《东北大学学报(自然科学版)》2017年08期 　论文类型：期刊论文

【摘要】：通过对螺纹连接结构承载分布问题的理论分析与数值模拟,探索影响螺纹副轴向力分布均匀性的关键因素.首先对螺纹副轴向承载分布进行理论分析,提出依据螺纹副截面上单位长度荷载F与螺纹牙相对变形u的关系曲线确定轴向力分布的解析方法.理论分析表明,当F-u关系曲线呈屈服形状时,螺纹副轴向承载力分布更加均匀.其次,对施必牢螺纹副进行分析,发现其F-u关系曲线呈现出屈服特征;从牙型设计、材料塑性和螺纹错动三方面进行分析,阐明施必牢螺纹副承载分布均匀性好的力学机制;最后,详细分析了螺纹副径向尺寸系数、摩擦因数和材料特性等因素对螺纹上轴向力分布的影响规律.
[Abstract]:Through the theoretical analysis and numerical simulation of the load distribution of threaded connection structure, the key factors affecting the uniformity of axial force distribution of thread pair are explored. Firstly, the axial load distribution of thread pair is analyzed theoretically. An analytical method is proposed to determine the axial force distribution according to the relationship curve between the unit length load F and the relative deformation u of the thread tooth on the thread pair section. The theoretical analysis shows that when the F-u relation curve assumes the yield shape. The axial bearing capacity distribution of the thread pair is more uniform. Secondly, the F-u relation curve of the thread pair is found to be yielding characteristic by the analysis of the thread pair. Based on the analysis of tooth shape design, material plasticity and screw thread dislocation, the mechanical mechanism of uniform load distribution of thread pair in Shibirong is expounded. Finally, the effects of radial dimension coefficient, friction coefficient and material characteristics on the axial force distribution on the thread pair are analyzed in detail.
【作者单位】：大连理工大学工业装备结构分析国家重点实验室;
【基金】：国家自然科学基金资助项目(11272074) 国家基础研究发展计划项目(613277)
【分类号】：TH131.3
【正文快照】： 螺纹连接因其操作性好、构造简单等优点广泛应用于机械结构中[1].但由于其结构特点承载时普遍存在轴向力分布不均,前几扣螺纹牙承载比例过大的问题[2-3],极大地影响了结构连接强度和可靠性.为解决这一问题,Sopwith[4]将螺纹牙看作悬臂梁结构,从理论上给出了螺纹副承载力分布不

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