杆模型的平流层飞艇蒙皮撕裂扩展分析

Tearing propagation of stratospheric airship envelope based on the link model

摘要:

针对飞艇高强纤维增强型蒙皮材料,研究预制裂纹切口蒙皮的撕裂扩展行为,以纱线单元为基础,借助杆模型,考虑纱线结点的粘合力、经纬向纱线脱胶滑移时的摩擦力,从细观结构分析裂纹切口的扩展机理,并建立裂纹切口扩展的力学模型．结合拉伸撕裂试验,采用不同长度、不同位置及不同角度的预制裂纹切口蒙皮试样进行试验,以获得裂纹扩展撕裂值．最后用Matlab对裂纹切口蒙皮试样撕裂进行仿真,获得了所建模型的撕裂仿真值．试验所得裂纹切口蒙皮的撕裂值与仿真值基本吻合,验证了所建模型的适用性,为平流层飞艇蒙皮材料的抗撕裂性能设计提供基础研究．

Abstract:

For high strength fiber airship envelope, a mesostructure model based on link model was built to explore its tearing propagation behavior by considering the friction and adhesion between the warp and weft yarn bundles. Tests with different length, location and angle incision crack specimens were carried out to observe the tearing propagation behavior which resulted in the tear propagation data under tensile tearing instruments. Combined with the mesosopic model and tests data, tearing propagation of the envelope material was simulated via Matlab to verify the model validity and obtain the max tearing values, which are in consistency with the tests, verifying the validity of the model and providing a new method to analyze the envelope tearing propagation behavior and predict the corresponding tearing values.