临近空间飞艇蒙皮用材料撕裂行为的数字散斑法研究  

Tearing Behavior for Near Space Airship Envelope Utilizing Digital Speckle Correlation Method

作　　者：刘龙斌[1] 曹帅[1] 吕明云[1] 

机构地区：[1]北京航空航天大学航空科学与工程学院,北京100191

出　　处：《科学技术与工程》2014年第20期137-143,共7页Science Technology and Engineering

摘　　要：针对Vectran纤维增强型临近空间飞艇蒙皮用的柔性层压织物复合材料,利用非接触式数字散斑相关试验方法,测定了预制初始裂纹长度为15 mm的中心切口试样撕裂行为的位移场和应变场分布,定量测量了撕裂试样不同撕裂载荷工况下的全场变形值和平面应力撕裂断裂韧性值,对中心切口裂纹的撕裂强度进行了分析。试验结果表明:该方法可以用来测量临近空间飞艇蒙皮用的柔性层压复合织物大范围变形的撕裂裂纹尖端及附近区域的变形场,通过变形场云图可以获得撕裂裂纹扩展过程中的变形特征,并可直观的研究撕裂裂纹尖端复杂变形场的形态,为临近空间飞艇蒙皮材料的撕裂损伤行为研究提供新的试验途径。The crack tip open displacement and the distribution of strain field were investigated on the Vectran fiber reinforced flexible laminated composite of near space airship envelope by experiments utilizing the digital speckle cormrelation method （DSCM）.For tearing tests of center initial crack （CIC） specimens with the length of 15 mm,all the deformation values and plane stress fracture toughness were measured quantitatively under different load conditions,and tear strength for center notched crack was obtained as well.Test results showed the DSCM method could be used to measure crack tip deformation field accurately,and to display the initial crack propagation law and the crack evolution characteristics of CIC,which provides a new approach to study the tear damage behavior of high performance airship envelope composite.

关 键 词：撕裂裂纹 数字散斑相关方法 临近空间飞艇 撕裂扩展 

分 类 号：V214.8[航空宇航科学与技术—航空宇航推进理论与工程]