<strong>B<sub>4</sub>C/6061Al</strong>复合材料热压缩断裂行为的多尺度研究

doi:10.11900/0412.1961.2018.00453

金属学报

2019, Vol. 55

Issue (7): 911-918 DOI: 10.11900/0412.1961.2018.00453

本期目录 | 过刊浏览

B₄C/6061Al复合材料热压缩断裂行为的多尺度研究

周丽¹,张鹏飞¹,王全兆²(

),肖伯律²,马宗义²,于涛¹

1. 烟台大学机电汽车工程学院烟台 264005
2. 中国科学院金属研究所沈阳材料科学国家研究中心沈阳 110016

Multi-Scale Study on the Fracture Behavior of Hot Compression B₄C/6061Al Composite

Li ZHOU¹,Pengfei ZHANG¹,Quanzhao WANG²(

),Bolü XIAO²,Zongyi MA²,Tao YU¹

1. School of Electromechanical and Vehicle Engineering, Yantai University, Yantai 264005, China
2. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

引用本文:

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.
Li ZHOU, Pengfei ZHANG, Quanzhao WANG, Bolü XIAO, Zongyi MA, Tao YU. Multi-Scale Study on the Fracture Behavior of Hot Compression B₄C/6061Al Composite[J]. Acta Metall Sin, 2019, 55(7): 911-918.

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摘要:

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

Abstract：

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

收稿日期: 2018-09-27

ZTFLH:

TG339

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)

作者简介: 周丽，女，1971年生，教授，博士

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https://www.ams.org.cn/CN/10.11900/0412.1961.2018.00453 或 https://www.ams.org.cn/CN/Y2019/V55/I7/911

图1 31%B4C/6061Al 复合材料的初始显微组织的OM像

图2 热压缩有限元模型

表1 31%B4C/6061Al复合材料热物理性能

图3 应变率10 s-1、压下量为75%时，31%B4C/6061Al复合材料热压缩后不同温度下的裂纹形貌

图4 应变率10 s-1、压下量为27%时，由剪切损伤模型计算所得不同温度下31%B4C/6061Al复合材料的裂纹形貌

图5 应变率10 s-1时由GTN损伤模型计算所得不同温度下31%B4C/6061Al复合材料的裂纹形貌

图6 应变率为10 s-1时不同温度下GTN损伤模型计算与实验裂纹深度对比

图7 不同温度和应变率下GTN损伤模型与实验所得热压缩过程中载荷-位移曲线的比较

图8 有限元模拟中特征位置的选取

图9 31%B4C/6061Al复合材料二维细观有限元模型的建立

图10 随压缩时间的延长，细观模型中裂纹的形成过程

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