纤维增强复合梁Ⅰ型裂纹尖端凝合区模型

MODEL FOR COHESIVE ZONE OF TOP OF TYPE Ⅰ CRACK IN FIBRE REINFORCED COMPOSITE BEAM

应用ＤｕｇｄａｌＢａｒｅｎｂｌｅｔ概念探讨了３点弯曲受力状态下，纤维正交排列复合梁的凝合区结构。在常值的内聚力假定下，计算了Ⅰ型深裂纹的凝合区尺寸。给出了凝合区尺寸依赖于附加应力的关系曲线。其结果与ＷＥＫ断裂模型所估计的损伤区尺寸颇为一致。

Cohesive zone structure of composite beam with orth woven fibers in a state of three points bending was investigated by the idea of Dugdal Barrenblett. Cohesive zone sizes of deep type Ⅰ crack were calculated assuming that cohesive force is constant.Curves of the dependence of cohesive zone sizes on additional stresses were given. The calculated results coincide with damage zone sizes estimated by means of WEK fracture model.