Chow Zhen Pei, Ahmad Zaini, Wong King Jye, Koloor Seyed Saeid Rahimian, Petrů Michal
School of Mechanical Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, Johor Bahru 81310, Malaysia.
Institute for Nanomaterials, Advanced Technologies and Innovation (CXI), Technical University of Liberec (TUL), Studentska 2, 461-17 Liberec, Czech Republic.
Polymers (Basel). 2021 Feb 4;13(4):492. doi: 10.3390/polym13040492.
This paper aims to propose a temperature-dependent cohesive model to predict the delamination of dissimilar metal-composite material hybrid under Mode-I and Mode-II delamination. Commercial nonlinear finite element (FE) code LS-DYNA was used to simulate the material and cohesive model of hybrid aluminium-glass fibre-reinforced polymer (GFRP) laminate. For an accurate representation of the Mode-I and Mode-II delamination between aluminium and GFRP laminates, cohesive zone modelling with bilinear traction separation law was implemented. Cohesive zone properties at different temperatures were obtained by applying trends of experimental results from double cantilever beam and end notched flexural tests. Results from experimental tests were compared with simulation results at 30, 70 and 110 °C to verify the validity of the model. Mode-I and Mode-II FE models compared to experimental tests show a good correlation of 5.73% and 7.26% discrepancy, respectively. Crack front stress distribution at 30 °C is characterised by a smooth gradual decrease in Mode-I stress from the centre to the edge of the specimen. At 70 °C, the entire crack front reaches the maximum Mode-I stress with the exception of much lower stress build-up at the specimen's edge. On the other hand, the Mode-II stress increases progressively from the centre to the edge at 30 °C. At 70 °C, uniform low stress is built up along the crack front with the exception of significantly higher stress concentrated only at the free edge. At 110 °C, the stress distribution for both modes transforms back to the similar profile, as observed in the 30 °C case.
本文旨在提出一种温度相关的内聚模型，以预测I型和II型分层情况下异种金属 - 复合材料混合结构的分层现象。使用商业非线性有限元（FE）代码LS-DYNA来模拟铝 - 玻璃纤维增强聚合物（GFRP）混合层压板的材料和内聚模型。为了准确表示铝和GFRP层压板之间的I型和II型分层，采用了具有双线性牵引分离定律的内聚区建模方法。通过应用双悬臂梁和端部切口弯曲试验的实验结果趋势，获得了不同温度下的内聚区特性。将实验测试结果与30、70和110°C下的模拟结果进行比较，以验证模型的有效性。与实验测试相比，I型和II型有限元模型的差异分别为5.73%和7.26%，显示出良好的相关性。30°C时裂纹前沿应力分布的特征是，I型应力从试样中心到边缘呈平滑逐渐降低。在70°C时，除了试样边缘应力积累低得多外，整个裂纹前沿达到最大I型应力。另一方面，30°C时II型应力从中心到边缘逐渐增加。在70°C时，除了仅在自由边缘集中的明显更高应力外，沿裂纹前沿建立了均匀的低应力。在110°C时，两种模式的应力分布恢复到与30°C情况类似的轮廓。
