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对缝线在复合材料层合板中的桥联作用进行参数分析,结果显示缝线的直径和拉伸强度,缝合角度,层合板厚度和挤压强度均会对缝线的桥联曲线以及断裂能产生影响,甚至改变缝线的破坏模式。以计算所得的桥联曲线作为输入参数,分别用连接器(Connector)和离散内聚力单元(Cohesive单元)的方法建立有限元模型,模拟缝线增强复合材料层合板的混合模式弯曲(MMB,Mix-Mode Bending)试验。两种方法的有限元计算结果具有较好的一致性,且均能够与文献中的试验数据较好吻合。相比离散Cohesive单元模型,Connector模型的计算效率更高,需要的输入参数更少,且建模更为简便。
The parameter analysis of the bridging effect of the suture in the composite laminates showed that the diameter and tensile strength of the suture, the suture angle, the thickness of the laminate and the compressive strength of the suture would affect the bridging curve of the suture and the fracture energy Have an impact, and even change the mode of destruction of the suture. Based on the calculated bridging curve as the input parameter, the finite element model was established by means of Connector and Cohesive unit respectively. The mixed mode bending (MMB) Mode Bending test. The results of the two methods have good agreement with each other, and they all fit well with the experimental data in the literature. Connector models are computationally more efficient, require fewer input parameters, and are easier to model than discrete Cohesive cell models.