| 基于格点-弹簧模型模拟含缺陷陶瓷材料的压缩破坏过程 |
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| 引用本文： | 吕文银1 张青艳2 周风华1. 基于格点-弹簧模型模拟含缺陷陶瓷材料的压缩破坏过程[J]. 宁波大学学报(理工版), 2017, 0(5): 76-82 |
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| 作者姓名： | 吕文银1 张青艳2 周风华1 |
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| 作者单位： | 1.宁波大学 冲击与安全工程教育部重点实验室, 浙江 宁波 315211; 2.嘉兴南洋职业技术学院, 浙江 嘉兴 314000 |
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| 摘 要： | 采用基于有限元参数映射的格点-弹簧模型(lattice spring model)对多晶三氧化二铝(Al2O3)陶瓷的压缩破坏过程进行了数值模拟. 采用弹脆性模型模拟材料, 用弱界面模拟材料晶界, 基于Griffith能量准则判断断裂. 模拟了特定孔隙率下的Al2O3陶瓷的冲击破坏过程, 所得到压缩强度与实验测试结果基本吻合. 考察了孔隙对材料压缩力学性能的影响, 结果显示: 有孔隙陶瓷表现出一定的应变率敏感性并且其裂纹密度时程曲线具有明显的“台阶”, 而无孔隙陶瓷没有此现象; 含孔隙陶瓷的裂纹密度发展过程中的“台阶”对应了内部裂纹的发展和止裂机制, 是有孔隙陶瓷和无孔隙陶瓷的重要区别.
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| 关 键 词： | 陶瓷 多孔性 压缩破坏 格点-弹簧模型 应变率 |
Lattice-spring model simulations on compressive failure process of ceramics with internal defects |
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| L? Wen-yin1,ZHANG Qing-yan2,ZHOU Feng-hua1. Lattice-spring model simulations on compressive failure process of ceramics with internal defects[J]. Journal of Ningbo University(Natural Science and Engineering Edition), 2017, 0(5): 76-82 |
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| Authors: | L? Wen-yin1 ZHANG Qing-yan2 ZHOU Feng-hua1 |
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| Affiliation: | 1.Key Laboratory of Impact and Engineering of Ministry of Education, Ningbo University, Ningbo 315211, China; 2.Jiaxing Nanyang Polytechnic Institute, Jiaxing 314000, China |
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| Abstract: | A lattice spring model based on Gusev’s finite element parameter mapping is used to simulate the failure of polycrystalline alumina (Al2O3) under compressive loading. An elastic-brittle model is utilized and the fracture criterion is set based on the Griffith’s energy principle. Grain boundaries are considered, which will affect crack propagation. Simulations of alumina with certain porosity under impact loading are carried out, showing that the peak compressive stresses, which represent the compressive strengths of the material, are in good agreement with the experimental results. Also investigated is the strain rate sensitivities of porous and non-porous specimens, finding that the porous specimen exhibits strain rate sensitivity while non-porous specimen does not. In addition, the former’s crack density history curve shows distinctive “steps”. Further analysis shows that there are two crack preventing mechanisms corresponding to these steps, which causes the apparent strain rate effect in porous ceramics. |
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| Keywords: | ceramics porosity compressive failure lattice-spring model strain rate effect |
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