论文部分内容阅读
对新型飞艇蒙皮材料在0°、15°、30°、45°、60°、75°、90°七个偏轴方向单轴拉伸循环试验结果进行了分析,给出了残余应变和弹性模量随循环次数的变化规律;得出了由单层板理论推导出的关于弹性模量的本构关系对各功能膜层压合成的平纹织物膜复合材料适用性较差。使用VIC-2D数字散斑测量系统测出膜材在拉伸过程中的位移场和应变场,通过位移场求膜材的泊松比和通过应变场验证分析膜材拉伸破坏机制,并可以预测断口形态和位置。采用两种不同规格的试样测试膜材的单轴拉伸强度,通过对比发现采用试样3更能反应材料Uretek5876实际强度。本文工作对该材料应用于飞艇结构设计和分析具有参考价值。
The test results of the uniaxial tension cycling test of the new airship in seven deviating directions of 0 °, 15 °, 30 °, 45 °, 60 °, 75 ° and 90 ° were analyzed. The residual strain and elasticity The results show that the constitutive relation of elastic modulus deduced by single-layer plate theory is not suitable to the plain woven fabric laminates synthesized by laminating various functional films. Using VIC-2D digital speckle measurement system to measure the displacement field and strain field of the membrane during the stretching process, the Poisson’s ratio of the membrane material is determined by the displacement field and the tensile damage mechanism of the membrane material is verified by the strain field. Predict fracture shape and location. Using two different specifications of the test specimen uniaxial tensile strength, through the comparison found that the sample 3 can better reflect the material Uretek5876 actual strength. This work has reference value for the application of the material in the design and analysis of airship structure.