B4C/6061Al复合材料热压缩断裂行为的多尺度研究
收稿日期: 2018-09-27
修回日期: 2018-12-19
网络出版日期: 2019-01-22
基金资助
国家重点研发计划项目(No.2017YFB0703104);国家自然科学基金项目(Nos.U1508216);国家自然科学基金项目(51771194);山东省自然科学基金项目(No.ZR2019MEE074)
Multi-Scale Study on the Fracture Behavior of Hot Compression B4C/6061Al Composite
Received date: 2018-09-27
Revised date: 2018-12-19
Online published: 2019-01-22
Supported by
Supported by National Key Research and Development Program of China(No.2017YFB0703104);National Natural Science Foundation of China(Nos.U1508216);National Natural Science Foundation of China(51771194);Natural Science Foundation of Shandong Province(No.ZR2019MEE074)
运用实验和模拟仿真相结合的方法研究了B4C/6061Al复合材料的热压缩断裂行为，确定了损伤模型及损伤参数。建立了单向多尺度有限元模型，分析了B4C/6061Al复合材料的细观损伤机理。结果表明，由于B4C/6061Al复合材料内部不均匀的细观结构，剪切损伤模型不能预测其断裂行为，而GTN损伤模型能准确预测B4C/6061Al复合材料的热压缩断裂行为。通过与实验结果的比较，确定了31%B4C/6061Al (质量分数)复合材料的GTN模型损伤参数，从而使模拟和实验获得的裂纹深度和载荷-位移曲线高度一致。此外，利用单向多尺度有限元法准确地分析了B4C/6061Al复合材料热压缩过程的细观损伤机理，即热压缩过程中出现的宏观裂纹是由颗粒的脆性断裂、基体和界面的脱黏以及基体的延性损伤导致的。
关键词： B4C/6061Al复合材料; 热压缩; 多尺度法; 断裂
周丽 , 张鹏飞 , 王全兆 , 肖伯律 , 马宗义 , 于涛 . B4C/6061Al复合材料热压缩断裂行为的多尺度研究[J]. 金属学报, 2019 , 55(7) : 911 -918 . DOI: 10.11900/0412.1961.2018.00453
B4C/Al composites possess excellent physical and mechanical properties, especially the capacity of neutron absorption, and therefore are increasingly used in nuclear industry for storage and transportation of spent fuels. However, very little study has reported the fracture behavior of B4C/Al composite under hot compression. Therefore, at the present work, the hot compression fracture behavior of B4C/6061Al composite was studied by combining experimental and simulation methods, and the fracture model and damage parameters were determined. A unidirectional multi-scale finite element model was established to analyze the meso damage mechanism of B4C/6061Al composite. The results show that the shear damage model cannot predict the fracture behavior of B4C/6061Al composite because of the inhomogeneous microstructure, and the GTN damage model can accurately predict the hot compression fracture behavior of B4C/6061Al composite. At the same time, by comparing with the experimental results, the GTN damage parameters of 31%B4C/6061Al composite were determined, and then by applying the damage parameters, the calculated crack depth and load-displacement curves agree well with the experimental results. In addition, the micro-damage mechanism of B4C/6061Al composite during hot compression process was analyzed accurately with the unidirectional multi-scale finite element method, which was caused by brittle fracture of particles, debonding between matrix and interface, and ductile damage of matrix.
Key words： B4C/6061Al composite; hot compression; multi-scale method; fracture
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