Numerical analysis of face sheet/core debonding failure in the plastic forming of aluminum foam sandwich panel
Numerical analysis of face sheet/core debonding failure in the plastic forming of aluminum foam sandwich panel
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DOI：
10.1007/s00170-023-12087-5
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发表时间：
2023-08
期刊：
影响因子：
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通讯作者：
Xi Zhang;Z. Cai;Jia-xin Gao;Ming-wei Wang
中科院分区：
文献类型：
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作者：
Xi Zhang;Z. Cai;Jia-xin Gao;Ming-wei Wang
对泡沫铝夹芯板塑性成形过程中面板/芯材脱粘失效进行了数值模拟研究。首先分析了成形过程中的脱粘破坏机理，然后引入双线性内聚区模型（CZM）模拟胶层的损伤和破坏，并在AFSP的平拉伸和搭接剪切试验和模拟的基础上，表征了CZM的具体参数。采用宏观等效AFSP模型对球形和马鞍形AFSP的塑性成形进行了大量模拟，以进一步了解脱粘行为，并进行了多点成形实验，利用X射线扫描变形件，以验证CZM对面板/芯脱粘的预测。进一步研究了粘结性能对面板/芯层脱粘失效的影响，结果表明，降低胶粘剂的初始刚度，提高胶粘剂的最大牵引力和临界断裂能，可以避免面板/芯层脱粘失效。
In the present work, face sheet/core debonding failure in the plastic forming of aluminum foam sandwich panel (AFSP) was numerically investigated. The mechanism of debonding failure during the forming process was analyzed first, and then, the bilinear cohesive zone model (CZM) was introduced to simulate the damage and the failure of adhesive layer, and the detailed parameters of CZM were characterized on the basis of the experiments and simulations of flatwise tensile and lap shear of AFSP. Extensive simulations on the plastic forming of spherical and saddle-shaped AFSPs were performed with a macroscopic equivalent AFSP model to gain further insight into the debonding behavior, and multi-point forming experiments were carried out and the deformed parts were scanned using X-ray to verify the face sheet/core debonding predictions using CZM. Furthermore, the effect of cohesive properties on face sheet/core debonding failure was researched, and the results reveal that debonding failure can be avoided by decreasing the initial stiffness of adhesive and increasing the maximum traction and the critical fracture energy of adhesive.