Study on crack tearing propagation of high altitude airship envelope composite material

摘要

High altitude airship (HAA) envelope material is vulnerable to be damaged and become failure with the long floating time in the space while withstanding severe and bad high space environment. HAA envelopee is composed of fabric laminated composite and the fabric yarn bundles are the main part to bear outer loads. Also the main bearing part is woven by Kevlar filaments and it is valid to analyze its mesomechanical properties as two-dimensional textile material. On the basis of yarn bundles mechanics, the paper considers the elastic and plastic deformation and collides among the bundles for its analysis. And the mesomechanic model is built to explore mechanisms on tearing propagation of pre-notched envelopee material samples. The results from the model computed by program language Matlab are compared with the test data for the same model. The comparative results are almost line with what the engineering requires.