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利用纤维Z-pins的细观力学模型构造了相应的Z-pin单元,结合考虑一阶剪切变形的梁单元,建立了用于分析含非对称分层采用Z-pins增韧的端部开口弯曲试件(End notched flexure,ENF)的有限元模型,并在分层裂纹面上引入接触单元以防止分析过程中2个分层子梁在端部开口处的相互嵌入。通过数值算例分析了Z-pins对含非对称分层的ENF试件Ⅱ型层间韧性的增强作用。参数分析表明,当分层位置靠近层合板的表面时,Z-pins的增韧作用明显下降,Z-pins对Ⅱ型层间韧性的增强作用主要由2个分层子层中较薄子层决定,但另一分层的厚度也对Ⅱ型层间韧性有一定的影响。
The corresponding Z-pin elements were constructed using the mesomechanical model of the fiber Z-pins. In combination with beam elements that considered the first-order shear deformation, an end opening for the analysis of Z-pins toughening with asymmetric delamination was established (Notched flexure, ENF) finite element model and the introduction of contact elements on the delaminated crack plane to prevent the two delaminated sub-beams embedded in the end openings during the analysis. Numerical examples were used to analyze the enhancement effect of Z-pins on type Ⅱ interlaminar toughness of ENF specimens with asymmetric delamination. Parametric analysis shows that the toughening effect of the Z-pins decreases obviously when the layering position is close to the surface of the laminate, and the enhancement effect of the Z-pins on the type II interlayer toughness mainly consists of two sub-layers Decided, but the thickness of another layer also has a certain impact on the type Ⅱ interlaminar toughness.