This study presents an experimental and analytical investigation on central crack tearing properties of PTFE coated fabric. Firstly, tearing tests under uniaxial tension load were carried out to investigate the influence of crack length and crack orientation on tearing properties of PTFE coated fabric. Tear failure process was carefully recorded and two types of failure modes can be characterized, i.e. progressive failure and brutal failure. The effect of initial crack length and orientation on tearing residual strength (TRS) can be attributed to the numbers of the cut yarns, which can be represented by the equivalent crack length. Secondly, the available TRS models are summarized and discussed in detail. It is found that these models can be classified into two types, i.e. fracture-mechanic-based models and stress-field-based models. By comparing the prediction results with test data, these models present to be only valid for small crack conditions, and the stress-field-based model shows better accuracy.

这项研究提供了对PTFE涂层织物中心开裂性能的实验和分析研究。首先，在单轴拉伸载荷下进行了撕裂试验，以研究裂纹长度和裂纹取向对PTFE涂层织物撕裂性能的影响。仔细记录了泪液破坏过程，可以表征两种类型的破坏模式，即进行性破坏和残酷破坏。初始裂纹长度和取向对撕裂残余强度（TRS）的影响可以归因于割断纱的数量，可以用等效裂纹长度表示。其次，对可用的TRS模型进行了总结和详细讨论。发现这些模型可以分为两种类型，即基于断裂力学的模型和基于应力场的模型。