Micro-mechanical finite element analysis of Z-pins under mixed-mode loading
Micro-mechanical finite element analysis of Z-pins under mixed-mode loading
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DOI：
10.1016/j.compositesa.2015.07.006
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发表时间：
2015-11
影响因子：
8.7
通讯作者：
Bing Zhang;G. Allegri;M. Yasaee;S. Hallett
中科院分区：
文献类型：
--
作者：
Bing Zhang;G. Allegri;M. Yasaee;S. Hallett
本文提出了一种三维细观力学有限元（FE）建模策略，用于预测复合材料层合板中插入单个Z销的混合模式响应。该建模方法是基于一个通用的层间网格，它考虑到显着的Z-销层压板的微观力学特征。该方法还考虑了固化后冷却的影响。Z-pin/层合板界面由内聚单元和摩擦接触建模。考虑剪切驱动的内部分裂，占使用凝聚力的元素，和拉伸纤维破坏，使用威布尔准则建模的Z-销的渐进故障进行模拟。模拟策略的校准和验证，通过实验测试进行单碳/BMI Z-针插入准各向同性层压板。讨论了Z-pin/层合板界面处的粘结和摩擦以及内部Z-pin分裂的影响。主要目的是开发一个强大的数值工具和指导方针，设计Z销最佳的桥接行为。
This paper presents a three-dimensional micro-mechanical finite element (FE) modelling strategy for predicting the mixed-mode response of single Z-pins inserted in a composite laminate. The modelling approach is based upon a versatile ply-level mesh, which takes into account the significant micro-mechanical features of Z-pinned laminates. The effect of post-cure cool down is also considered in the approach. The Z-pin/laminate interface is modelled by cohesive elements and frictional contact. The progressive failure of the Z-pin is simulated considering shear-driven internal splitting, accounted for using cohesive elements, and tensile fibre failure, modelled using the Weibull’s criterion. The simulation strategy is calibrated and validated via experimental tests performed on single carbon/BMI Z-pins inserted in quasi-isotropic laminate. The effects of the bonding and friction at the Z-pin/laminate interface and the internal Z-pin splitting are discussed. The primary aim is to develop a robust numerical tool and guidelines for designing Z-pins with optimal bridging behaviour.