多向受力状态下复合材料预紧力齿连接接头应力分析  

STRESS ANALYSIS OF COMPOSITE PRE-TIGHTENED TEETH CONNECTION JOINT UNDER MULTIAXIAL LOADING CONDITION

作　　者：晏孝强 刘亚文[1] 赵启林[2] 李飞[3] 

机构地区：[1]解放军理工大学野战工程学院,南京210007 [2]南京工业大学机械与动力工程学院,南京210007 [3]解放军后勤工程学院,重庆400000

出　　处：《玻璃钢／复合材料》2017年第11期25-31,共7页Fiber Reinforced Plastics/Composites

基　　金：国家自然科学基金资助项目(11372355)

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。To explore the composite space truss bridge key node pre-tightened teeth joint stress distribution under the multiaxial loading state,multiscale finite element model of the composite space truss bridge was established.The multi-scale model can not only obtain the overall structural performance of the truss bridge and the stress distribution of the local joint,but also can effectively reflect the interaction between the two.Through this model,the stress distribution of the joint in the multi-directional loading state is studied.The results show that when the joint force is applied,the normal stress of the tooth surface attenuation is within 5 MPa with respect to when the assembly is completed,and the multi-directional force joint attenuation is mitigatory relative to the one-way force connector.After the attenuation,the normal stress of the multi-direction joint is slightly higher than that of the uniaxial joint.The ratio of each tooth load distribution of the multi-directional force joint is basically the same with that of the unidirectional force joint,and distribution is high on both sides and low in the middle.The transverse shear stress of the composite of the joint is higher than that of the uniaxial force joint,but the transverse shear stress is much smaller than the transverse shear strength of the material.The joint is in the safe state.The results can provide a reference for the design of composite pre-tightened teeth joint.

关 键 词：FRP空间桁架桥 预紧力齿连接 多尺度有限元 多向受力 应力分析 

分 类 号：TB332[一般工业技术—材料科学与工程]