摘要
通过在纳米纤维和基体之间应用无厚度指数型内聚力单元,建立纳米增强陶瓷基复合材料的界面损伤本构关系。利用MARC有限元分析纳米纤维与基体之间含界面损伤时,单一纳米纤维及纳米纤维和纳米颗粒双相增强陶瓷基复合材料受位移荷载作用时的应力-应变响应。结果表明:纳米纤维与基体之间的界面损伤演化主要由内聚力单元的最大裂纹张开位移控制,与单一增强情况相比,纳米纤维与纳米颗粒的双相作用更有利于提高陶瓷基复合材料的强度,内聚力模型能准确模拟纳米纤维与陶瓷基体之间的界面裂纹扩展,是研究纳米复合材料损伤的有效方法。
The constitutive equations of interracial damage of ceramic composites reinforced with nano-fiber and nano- particle were established by means of exponential cohesive force model. The model was constituted by the software of MARC, and the stress-strain relationship of ceramic composites with interracial damage was discussed under the action of displacement loading. The experimental results indicate that the maximum crack opening displacement of interracial element is the important factor to control the damage progress. Compared to ceramic composites reinforced with only nano-fiber, the ceramic composites reinforced with nano-fber and nano particle have high strength, and the interaction between nano-fiber and nano-particles is beneficial to increase the strength of ceramic composites. The cohesive force model can precisely predict interracial crack evolution, and it is an effective method to analyze the damage of nano-composites.
出处
《武汉理工大学学报》
CAS
CSCD
北大核心
2014年第4期18-23,共6页
Journal of Wuhan University of Technology
基金
国家自然科学基金(111720661A020305)
广东省自然科学基金(S2011010004874)
关键词
内聚力模型
纳米纤维与纳米颗粒
陶瓷基复合材料
界面损伤
数值模拟
cohesive force model
nano-fiber and nano-particle
ceramic composites
interracial damage
numerical simulation
