复合材料沉头搭接强度与渐进损伤研究

发布时间：2018-01-08 05:01

本文关键词：复合材料沉头搭接强度与渐进损伤研究　出处：《玻璃钢/复合材料》2017年04期 　论文类型：期刊论文

【摘要】：基于三维渐进损伤理论,引入Tserpes失效准则及其改进的材料性能退化准则,建立复合材料沉头搭接结构的有限元模型。在试验验证数值仿真模型正确性的基础上,探讨了端距、板宽及拧紧力矩对接头强度的影响,并对搭接接头从初始损伤到最终失效的过程进行可视化模拟。结果表明,端径比由2到4、宽径比由3到5、拧紧力矩由0到5.9 N·m的过程中,接头强度明显增强,超过上述范围,强度增加不明显或不再增加。在静拉伸过程中,2号钉孔处复合材料板的损伤程度要比1号钉孔处严重,且2号钉孔的损伤扩展导致接头最终失效;90°铺层最先产生损伤,其类型主要为基体开裂,0°铺层损伤情况最弱,±45°铺层沿着-45°方向产生基体开裂,随后沿板宽方向产生大量纤维断裂。
[Abstract]:Based on the three dimensional progressive damage theory, the Tserpes failure criterion and its improved degradation criterion are introduced. The finite element model of composite countersunk joint structure is established. Based on the correctness of numerical simulation model, the effects of end distance, plate width and tightening moment on joint strength are discussed. The visual simulation of the lap joint from initial damage to final failure shows that the ratio of end to diameter is from 2 to 4, the ratio of width to diameter is from 3 to 5, and the tightening torque is from 0 to 5.9 N 路m. The strength of the joint is obviously enhanced, beyond the above range, the strength increase is not obvious or no longer. In the static tensile process, the damage degree of the composite plate at the No. 2 nail hole is more serious than that at the No. 1 nail hole. And the damage expansion of the No. 2 nail hole leads to the ultimate failure of the joint. The first damage occurred in 90 掳layer, the main type of damage was that the matrix cracking was the weakest in 0 掳layer, and 卤45 掳layer produced matrix cracking along the direction of -45 掳. Then a large number of fibers fracture along the wide direction of the plate.
【作者单位】：郑州大学机械工程学院;
【基金】：国家自然科学基金(U1333201) 河南省科技攻关项目(152102210039)
【分类号】：TB33
【正文快照】： 复合材料凭借其比强度及比刚度高、抗疲劳及抗腐蚀性能好等优越性能,在航空器的设计制造方面得到了极大应用,已成为决定航空器先进性的重要指标。在飞机的结构设计中,随着结构整体化设计的发展,构件和紧固件数量大大减少,连接传递的载荷变得更大,因此连接成为更加关键的结构[1

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