| 不同载荷下螺栓法兰连接结构非线性刚度影响因素 |
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| 引用本文： | 王开平,闫明,孙自强,苏东海,惠安民,刘海超.不同载荷下螺栓法兰连接结构非线性刚度影响因素[J].航空动力学报,2021,36(12):2503-2514. |
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| 作者姓名： | 王开平 闫明 孙自强 苏东海 惠安民 刘海超 |
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| 作者单位： | 沈阳工业大学 机械工程学院，沈阳 110870 |
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| 基金项目： | 国家自然科学基金（51705337）； 辽宁省“兴辽英才计划”项目（XLYC1802077） |
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| 摘 要： | 为研究各影响因素对螺栓法兰连接结构非线性刚度的影响规律，建立了带升角螺纹连接结构精细有限元模型，进行了全六面体网格划分，并验证了模型的有效性，分别进行了拉伸、弯曲、扭转载荷下仿真分析。结果表明:螺栓初始预紧力越大，连接结构抗弯、抗扭刚度越大，初始预紧力对抗拉刚度没有影响，拉伸载荷下初始预紧力提高了两法兰分离的临界阻力，弯曲载荷下，初始预紧力越大，触发两法兰出现开口状态的外部弯曲力矩值越大，各螺栓越不容易承担外力，两法兰开口前，初始预紧力对连接结构抗弯刚度影响较小，开口后影响较大；螺栓直径越大、个数越多，连接结构抗拉、抗弯、抗扭刚度越大；螺栓位置越靠近法兰筒，连接结构抗拉刚度越大，分别存在一个最优螺栓位置值，使得连接结构抗弯和抗扭刚度最大；结合面间摩擦因数对连接结构抗拉、抗弯刚度没有影响，结合面间摩擦因数越大，连接结构抗扭刚度越大，其中法兰-法兰结合面间摩擦因数对刚度曲线第一段内抗扭刚度影响较大，螺栓-法兰结合面间摩擦因数对第二段内影响较大。
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| 关 键 词： | 螺栓法兰连接结构 拉伸载荷 弯曲载荷 扭转载荷 刚度 |
| 收稿时间： | 2020/12/18 0:00:00 |
Influence factors of nonlinear stiffness of bolted flange connection structure under different loads |
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| WANG Kaiping,YAN Ming,SUN Ziqiang,SU Donghai,HUI Anmin,LIU Haichao.Influence factors of nonlinear stiffness of bolted flange connection structure under different loads[J].Journal of Aerospace Power,2021,36(12):2503-2514. |
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| Authors: | WANG Kaiping YAN Ming SUN Ziqiang SU Donghai HUI Anmin LIU Haichao |
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| Affiliation: | School of Mechanical Engineering，Shenyang University of Technology，Shenyang 110870，China |
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| Abstract: | In order to study the influence of various factors on the nonlinear stiffness of bolted flange connection structure，a fine finite element model of screw connection structure with rising angle was established，the full hexahedron mesh generation was carried out，and the validity of the model was verified.The simulation analysis under tension，bending and torsion load was carried out respectively.The results showed that the larger initial pre-tightening force indicated the greater bending and torsional stiffness of the connection structure，and the initial pre-tightening force had no influence on the tensile stiffness.Under the tensile load，the initial preload increased the critical resistance of the separation of the two flanges.Under the bending load，the greater initial preload indicated the greater external bending moment triggering the opening of the two flanges，and it was more difficult for each bolt to bear the external force.Before the opening of two flanges，the initial pre-tightening force had little influence on the bending stiffness of the connection structure，but the influence was greater after the opening；the larger diameter and more number of bolts indicated the greater tensile，bending and torsional stiffness of the connection structure；the closer bolt position to the flange tube indicated the greater tensile stiffness of the connection structure.The friction coefficient between the joint surfaces had no influence on the tensile and bending stiffness of the connection structure.The greater friction coefficient between the joint surfaces indicated the greater torsional stiffness of the connection structure.The friction coefficient between the flange and flange joint surface had a greater influence on the torsional stiffness in the first section of the stiffness curve，while the friction coefficient between the bolt flange joint surface had a greater influence on the second section. |
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| Keywords: | bolted flange connection structure tensile load bending load torsion load stiffness |
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