飞艇用层压织物类膜材中心撕裂破坏机理模型
发布时间：2019-06-02 10:51
【摘要】：中心撕裂破坏是飞艇用层压织物类膜材失效破坏的基本形式之一.基于层压织物类膜材的平纹织物结构特征,建立了具有平面纱线结构的中心切缝撕裂机理模型,该模型应用了"等效纱线"及"应力集中渐变区"两个概念,分别实现模型参数的简化和应力集中区域应力场分布的细化.运用所提机理模型实现了对不同切缝长度时(10~40mm)经纬向层压织物类膜材撕裂破坏行为特征的预测,分析了蒙皮材料撕裂扩展机理,并结合试验结果证实了模型预测的精确性和可行性.由模型分析获得了蒙皮材料在渐变区推移过程中的撕裂承载力及变形特征,发现纱线的失效应变、弹性模量以及编织密度等是影响蒙皮材料撕裂抗力的主要因素.所得结论及研究方法可为层压织物类膜材的强度设计、裂纹止裂分析及结构的安全性评估提供理论参考.
[Abstract]:Central tear failure is one of the basic forms of membrane failure of laminated fabric for airship. Based on the structural characteristics of plain fabric with laminated fabric film, a central slit tearing mechanism model with planar yarn structure is established. The model applies the concepts of "equivalent yarn" and "stress concentration gradient zone". The simplification of model parameters and the refinement of stress field distribution in stress concentration area are realized respectively. The tear failure behavior of longitude and weft laminated fabrics with different slit lengths (10~40mm) was predicted by using the proposed mechanism model, and the tear propagation mechanism of skin materials was analyzed. The accuracy and feasibility of the model prediction are verified by the experimental results. The tear bearing capacity and deformation characteristics of the skin material during the gradual change zone were obtained by model analysis. It was found that the failure strain, elastic modulus and braiding density of the yarn were the main factors affecting the tear resistance of the skin material. The conclusions and research methods can provide theoretical reference for strength design, crack arrest analysis and structural safety evaluation of laminated fabric membranes.
【作者单位】： 南京理工大学理学院;上海交通大学空间结构研究中心;
【基金】：国家自然科学基金资助项目(51278299) 江苏省基础研究计划(自然科学基金)资助项目(BK20150775)
【分类号】：V274
，
本文编号：2491036
[Abstract]:Central tear failure is one of the basic forms of membrane failure of laminated fabric for airship. Based on the structural characteristics of plain fabric with laminated fabric film, a central slit tearing mechanism model with planar yarn structure is established. The model applies the concepts of "equivalent yarn" and "stress concentration gradient zone". The simplification of model parameters and the refinement of stress field distribution in stress concentration area are realized respectively. The tear failure behavior of longitude and weft laminated fabrics with different slit lengths (10~40mm) was predicted by using the proposed mechanism model, and the tear propagation mechanism of skin materials was analyzed. The accuracy and feasibility of the model prediction are verified by the experimental results. The tear bearing capacity and deformation characteristics of the skin material during the gradual change zone were obtained by model analysis. It was found that the failure strain, elastic modulus and braiding density of the yarn were the main factors affecting the tear resistance of the skin material. The conclusions and research methods can provide theoretical reference for strength design, crack arrest analysis and structural safety evaluation of laminated fabric membranes.
【作者单位】： 南京理工大学理学院;上海交通大学空间结构研究中心;
【基金】：国家自然科学基金资助项目(51278299) 江苏省基础研究计划(自然科学基金)资助项目(BK20150775)
【分类号】：V274
，
本文编号：2491036
本文链接：https://www.wllwen.com/kejilunwen/hangkongsky/2491036.html
