摘要
通过挤压法对复合材料预紧力齿连接接头施加预紧力时,外部挤压量的大小决定了施加在接头上的预紧力大小。本文通过理论、有限元和实验研究了外部挤压量和接头预紧力之间的对应关系。在理论推导时,首先将钢和铝合金简化为理想弹塑性材料,将拉挤复合材料简化为横观各向同性材料,然后通过厚壁圆筒理论得出了在不同挤压量下界面径向压应力的理论计算公式,并通过有限元和实验进行了验证,最后在此基础上进行了参数研究。研究表明:①理论解与有限元解以及实验值吻合较好,这证明了理论公式推导的正确性;②在仅改变壁厚的情况下,界面径向压应力随铝合金内套筒壁厚的增加呈线性增长趋势,而外部钢套筒壁厚对其的影响不大;③将内套筒材料由铝合金换成钢,在其他条件不变的情况下,界面径向压应力会得到显著提高。
In the composite pre-tightened tooth connections,the pre-tightening force determines the ultimate bearing capacity of the joint.When the pre-tightening force is applied by external extrusion,the size of external extrusion determines the pre-tightening force applied to the joint.In this paper,the relationship between external extrusion and pre-tightening force is studied by theory,finite element and experiment.Firstly,steel and aluminum alloy are simplified as ideal elastoplastic materials,and pultrusion composites are simplified as transversely isotropic materials.Then,through the thick wall cylinder theory,the theoretical formula for calculating the radial compressive stress of the interface under different extrusion variable is obtained,which is verified by finite element method and experiment.Finally,the parameters are studied on this basis.The results show that:(1)The theoretical solution is in good agreement with the finite element solution and the experimental value,which proves the correctness of the theoretical formula.(2)When only the wall thickness is changed,the radial compressive stress of the interface increases linearly with the increase of the wall thickness of aluminum alloy inner casing,while the external steel casing wall thickness has little influence on it.(3)When the material of inner sleeve is changed from aluminum alloy to steel and other conditions remain unchanged,the radial compressive stress of the interface will be significantly increased.
作者
左扬
李飞
赵启林
高建岗
ZUO Yang;LI Fei;ZHAO Qi-lin;GAO Jian-gang(College of Mechanical and Power Engineering,Nanjing Tech University,Nanjing 211816,China;College of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China;College of Field Engineering,Army Engineering University,Nanjing 210007,China)
出处
《复合材料科学与工程》
CAS
北大核心
2020年第5期32-39,共8页
Composites Science and Engineering
基金
国家自然科学基金(11702324)。
关键词
挤压量
预紧力
复合材料
有限元
extrusion variable
pre-tightening force
composite material
finite element
