多向受力状态下复合材料预紧力齿连接接头应力分析
发布时间：2019-01-18 17:46
【摘要】：为了探究复合材料空间桁架桥中关键节点预紧力齿连接接头在多向受力状态下的应力分布,对复合材料空间桁架桥建立多尺度有限元模型。该多尺度模型不仅可以同时获得桁架桥整体结构性能与局部接头应力状态,还可以有效反映两者的相互作用关系。通过该模型,对接头在多向受力状态下的应力分布展开研究,研究表明:预紧力齿接头受力之后,齿面正应力较过盈装配完成时有5 MPa以内的衰减;且多向受力接头较单向受力接头衰减缓和,衰减后多向受力接头齿面正应力略高于单向受力接头齿面正应力;多向受力接头各齿荷载分配比例与单向受力基本一致,均为两侧高中间低;多向受力接头复合材料管横向剪切应力较单向受力接头有一定增大,但最不利荷载工况下的横向剪切应力为15.7 MPa,远小于材料横向剪切强度,接头处于安全状态。所得结果可为复合材料预紧力齿接头设计提供参考依据。
[Abstract]:In order to study the stress distribution of the key joints of the composite space truss bridge under multi-direction stress, a multi-scale finite element model was established for the composite space truss bridge. The multi-scale model can not only obtain the global structural performance of truss bridge and the stress state of local joints simultaneously, but also reflect the interaction between them. Through this model, the stress distribution of the joint under multi-direction loading is studied. The results show that the normal stress on the tooth surface decreases within 5 MPa after the pretension force joint is finished. Compared with unidirectional joint, the normal stress of multidirectional joint is slightly higher than that of unidirectional joint. The load distribution ratio of each tooth of multi-directional joint is basically the same as that of unidirectional force, and it is both high and middle low on both sides. The transverse shear stress of multidirectional joint composite tube is higher than that of unidirectional joint, but the transverse shear stress of 15.7 MPa, under the most unfavorable load condition is much smaller than the transverse shear strength of the material, and the joint is in a safe state. The results can provide a reference for the design of composite pretightening tooth joint.
【作者单位】： 解放军理工大学野战工程学院;南京工业大学机械与动力工程学院;解放军后勤工程学院;
【基金】：国家自然科学基金资助项目(11372355)
【分类号】：U441
[Abstract]:In order to study the stress distribution of the key joints of the composite space truss bridge under multi-direction stress, a multi-scale finite element model was established for the composite space truss bridge. The multi-scale model can not only obtain the global structural performance of truss bridge and the stress state of local joints simultaneously, but also reflect the interaction between them. Through this model, the stress distribution of the joint under multi-direction loading is studied. The results show that the normal stress on the tooth surface decreases within 5 MPa after the pretension force joint is finished. Compared with unidirectional joint, the normal stress of multidirectional joint is slightly higher than that of unidirectional joint. The load distribution ratio of each tooth of multi-directional joint is basically the same as that of unidirectional force, and it is both high and middle low on both sides. The transverse shear stress of multidirectional joint composite tube is higher than that of unidirectional joint, but the transverse shear stress of 15.7 MPa, under the most unfavorable load condition is much smaller than the transverse shear strength of the material, and the joint is in a safe state. The results can provide a reference for the design of composite pretightening tooth joint.
【作者单位】： 解放军理工大学野战工程学院;南京工业大学机械与动力工程学院;解放军后勤工程学院;
【基金】：国家自然科学基金资助项目(11372355)
【分类号】：U441
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