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L型钛铝角片螺栓对接结构静态拉伸力学性能研究
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V215.6

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国家重大科技专项


A Study of Static Tensile Mechanical Properties of Bolted Joints with L-Shaped Ti-Al Curved Laminate
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    摘要:

    为研究螺栓偏心距离及安装方向对L型钛铝角片螺栓对接结构静态拉伸力学性能的影响,采用试验及数值仿真相结合的方法进行研究。设计螺栓纯拉伸、螺栓正装及螺栓反装3种构型共7组试验件进行力学性能测试,通过纯拉伸构型获得螺栓的纯拉伸承载能力及破坏模式,正、反装构型获得偏心距离与安装方向对角片对接结构力学性能的影响。使用ABAQUS软件建立仿真模型对试验结果进行复现,通过Johnson-Cook模型定义螺栓的塑性及失效模型,数值仿真得到的模型刚度、失效模式及载荷与试验结果吻合度较高,且能够清晰地描述螺栓裂纹的起始位置与扩展过程。通过试验与数值仿真研究可知,由于偏心弯矩的影响,L型角片对接结构的破坏载荷远低于螺栓的纯拉伸承载能力,且随着偏心距离的增大而降低。相同偏心距离下,螺栓反装构型的破坏载荷略高于正装构型。螺栓纯拉伸及反装构型破坏模式为螺栓横截面断裂(Ⅰ型),螺栓正装构型破坏模式为螺栓头翘起破坏(Ⅱ型)。上述研究对L型角片螺栓对接结构的设计具有指导意义。

    Abstract:

    In order to research the effect of bolt eccentric distance and install direction on static tensile behavior of bolted joints with L-shaped Ti-Al curved laminate, the researches are adopted by the experimental and numerical methods. A test is accomplished on 7 sets of specimens with 3 groups (i.e. pure tension bolted,up bolted and down bolted) divided. The test results demonstrate the average collapse load and mode of group A respectively. The Influence of eccentric distance and installation direction on mechanical behavior of bolted joints is investigated by group B、C. FEMS are proposed by ABAQUS to reproduce the test results of the above-mentioned groups. Through Johnson-Cook, the plastic and failure criteria of the bolt are developed. The stiffness, failure mode and collapse load obtained by FEM method are in good agreement with the experimental results. Besides, the FEM can clearly describe the starting position and expansion process of bolt breakage. According to the experimental and numerical research, the failure load of butt-bolted joints is much lower than that of the bolt pure tension group due to the additional bending moment, and the ultimate loads decrease with the increase of eccentric distance. Furthermore, the ultimate loads of down bolted are slightly higher than that of the up bolted while comparing specimens with the same eccentric distance. The failure mode of group A and C is bolt cross-section fracture (type I), while the failure mode of group B is bolt head curling failure (type Ⅱ). This study has a certain of guiding significance for the design of bolted joints with L-Shaped curved laminate.

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郭轩,张引利, 刘彦杰, 刘洪权,惠战荣. L型钛铝角片螺栓对接结构静态拉伸力学性能研究[J].空军工程大学学报,2025,26(1):18-25

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  • 在线发布日期: 2025-02-16
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