浮空器撕裂装置撕裂力计算方法研究

THE STUDY ON CALCULATION METHOD OF THE TEARING FORCE FOR A TEARING DEVICE ON AEROSTAT

基于线弹性断裂力学的理论基础,对一种新型浮空器撕裂装置的撕裂力计算方法进行了研究。首先通过Ⅰ型和Ⅲ型撕裂试验,获得薄膜材料的Ⅰ型和Ⅲ型临界应变能量释放率GIC和GIIIC。应用Debond和VCCT技术构建Ⅰ型撕裂、Ⅲ型撕裂和新型撕裂装置的有限元模型,选择Power模型作为裂纹扩展判据,并分别通过Ⅰ型、Ⅲ型撕裂试验结果和仿真结果匹配计算拟合出Power模型中的指数。最后,基于新型撕裂装置有限元模型和Power模型求解出撕裂力,通过物理实验验证结果的有效性,表明该计算方法确实可行。

A method for calculating the tearing force of a new type of tearing device for aerostat was studied based on the theory of linear elastic fracture mechanics.Firstly,the critical strain energy release rates GICand GIIICof the film materials were obtained by fracture tests of type Ⅰ and Ⅲ.The FEA Models of the tears-Ⅰ,tears-Ⅲ and the tearing device were constructed by Debond and VCCT technology.The Power model was selected as the crack extension criterion,and the index in the Power model was fitted by the FEA results and test results of Type Ⅰ and Type Ⅲ tearing respectively.Finally,the tearing force of the tearing device was calculated based on the finite element model and the power model.The effectiveness of the results was verified by physical experiments,indicating that the calculation method of the tearing force for the new tearing device is feasible.