[author_cn_name].[cn_title][J].空军工程大学学报:自然科学版,[year_id],[volume]([issue]):[start_page]-[end_page] 拧紧力矩对复合材料层合板与金属板连接强度影响-Influence of Tightening Torque on the Joint Strength of Composite Laminate and Metal Plate
文章摘要
刘峰,王坤,周建国,陈威杨.拧紧力矩对复合材料层合板与金属板连接强度影响[J].空军工程大学学报:自然科学版,2020,21(6):13-18
拧紧力矩对复合材料层合板与金属板连接强度影响
Influence of Tightening Torque on the Joint Strength of Composite Laminate and Metal Plate
  
DOI:
中文关键词: 拧紧力矩  复合材料  层合板  连接  强度
英文关键词: tightening torque  composite  laminate  joint  strength
基金项目:中国民用航空飞行学院研究生创新项目(X2018-5)
作者单位
刘峰,王坤,周建国,陈威杨 中国民用航空飞行学院航空工程学院 四川广汉, 618307 
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中文摘要:
      完成了不同拧紧力矩下复合材料层合板与金属板单钉连接拉伸静强度实验。建立了三维有限元模型,对层合板失效过程进行了分析。基于实验数据调整了层合板初始刚度,对数值模型进行了修正。修正后数值计算模型的连接强度与实验数据基本吻合。由分析可知,拉伸实验曲线达到强度极限前呈现近似双线性特征,斜率突变处发生了载荷衰减波动。试件接触面经历了初始静摩擦-瞬时动摩擦-静摩擦平衡的动态过程。M6螺栓拧紧力矩为8 N·m时,静载拉伸强度最大。连接强度的试验值与计算值误差均在6.7%以内。合适的拧紧力矩可获得最佳的连接强度,拧紧力矩过大会导致连接强度降低。
英文摘要:
      A three dimensional finite element model of the joint assembly is built, and the failure evolution process of the composite laminate is analyzed. The numerical analysis model is modified by regulating initial stiffness coefficients of the laminate based on the strength test data. The joint strength of the modified numerical model is fitted well with that of static loading test. It follows that the approximate dual linear characteristics is found in the tensile test curves before the ultimate strength is met, and tensile load attenuation surge happens at the point where the gradient discontinuity occurs. The contact faces of the tensile test specimen encounter a process from initial static friction state, transient slide friction state to final static friction equilibrium state. When there is a M6 bolt with 8 N·m tightening torque, its tensile strength is the maximum, and the relative errors of joint strength between the numerical analysis results and that of the tensile test are all less than 6.7%. The best joint strength can be obtained to proper tightening torque, whereas excessive tightening torque may lead to strength reduction.
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