新型飞艇蒙皮材料GQ-6双轴撕裂性能分析
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摘要
通过试验研究和理论分析,对一种新型飞艇蒙皮材料GQ-6的撕裂性能进行了研究.试验结果表明,此种新型蒙皮材料的撕裂性能随着切缝长度的增大而降低;不同切缝角度情况下,GQ-6蒙皮材料的切缝会在垂直于经纱或者纬纱方向扩展.同时,当初始切缝长度相同、倾斜角不同时,垂直于纱线方向时GQ-6的抗撕裂强度最低.通过对试验数据整理,计算得到了GQ-6蒙皮材料经向和纬向的应力强度因子.通过理论与实验对比分析,将等效长度概念成功引入到GQ-6蒙皮材料的强度计算.所得结论可以为蒙皮材料强度设计以及飞艇结构可靠性评估提供可操作性的参考.
This paper studied the tearing properties of a new airship envelope fabric GQ-6 through experimental investigation and theoretical analysis.The experimental results revealed that mechanical properties of GQ-6 decrease with the increase of the initial crack length.The crack will propagate along the warp or the weft yarns direction,which depends on the crack orientation.Meanwhile,if the initial crack length is fixed,the tear stress of such envelope fabric will be the least when the initial crack emerges along the yarns direction.The intensity factor for the fabric is determined based on experimental results.Based on comparison between the experimental data and the theoretical simulation,the concept of equivalent initial crack length is introduced to the calculation on tear stress of GQ-6 envelope.The above conclusion can provide an achievable technical plan for the tear stress calculation and reliable analysis of an airship.
This paper studied the tearing properties of a new airship envelope fabric GQ-6 through experimental investigation and theoretical analysis.The experimental results revealed that mechanical properties of GQ-6 decrease with the increase of the initial crack length.The crack will propagate along the warp or the weft yarns direction,which depends on the crack orientation.Meanwhile,if the initial crack length is fixed,the tear stress of such envelope fabric will be the least when the initial crack emerges along the yarns direction.The intensity factor for the fabric is determined based on experimental results.Based on comparison between the experimental data and the theoretical simulation,the concept of equivalent initial crack length is introduced to the calculation on tear stress of GQ-6 envelope.The above conclusion can provide an achievable technical plan for the tear stress calculation and reliable analysis of an airship.
引文
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[8]BIBAUD D,SZOSTKIEWICZ C,HAMELIN P.Tearing analysis for textile reinforced soft composites under mono-axial and bi-axial tensile stresses[J].Composite Structures,2003,62(2):129-137.
[2]顾正铭.平流层飞艇蒙皮材料的研究[J].航天返回与遥感,2007,28(1):62-66.GU Zheng-ming.Research of stratospheric airships’skin material[J].Spacecraft Recovery&Remote Sensing,2007,28(1):62-66.
[3]高海健,陈务军,付功义.浮空器囊体膜材力学性能试验研究[J].空间结构,2010,16(1):57-64.GAO Hai-jian,CHEN Wu-jun,FU Gong-yi.Experiments on the mechanical properties of envelope fabrics of LTA aerostat[J].Spatial Structures,2010,16(1):57-64.
[4]陈建稳,陈务军,赵兵.浮空器膜材循环拉伸力学性能及弹性常数研究[J].湖南大学学报(自然科学版),2013,40(6):40-46.CHEN Jian-wen,CHEN Wu-jun,ZHAO Bing.Study of the mechanical properties and elastic constants of aerostat envelope fabric under cyclic tensile loading[J].Journal of Hunan University(Natural Sciences),2013,40(6):40-46.
[5]WANG F X,CHEN Y L,XU W,et al.Experimental study on uniaxial tensile and welding performance of a new coated fabric for airship envelopes[J].Journal of Industrial Textiles,2016,46(7):1474-1497.
[6]SHOJI M T Y.Tear propagation of a high performance airship envelop material[J].Journal of Aircraft,2008,5(45):1546-1553.
[7]ISIDA M.Analysis of stress intensity factors for the tension of a centrally cracked strip with stiffened edges[J].Engineering Fracture Mechanics,1973,5(3):647-665.
[8]BIBAUD D,SZOSTKIEWICZ C,HAMELIN P.Tearing analysis for textile reinforced soft composites under mono-axial and bi-axial tensile stresses[J].Composite Structures,2003,62(2):129-137.