摘要
采用双线性traction-separation模型描述氮化硼(BN)界面层分离特性,根据文献提供的试验过程,基于内聚力单元建立了SiC_(f)/BN/SiC复合材料单纤维顶出的轴对称有限元分析模型,对不同界面层临界断裂能、极限强度和厚度情况下的纤维顶出过程进行了模拟。结果表明,模拟得到的纤维最大顶出载荷与试验数据相差1.74%,表明该模型的有效性;纤维最大顶出载荷随临界断裂能、界面层厚度的增大而增大,而极限强度对其影响不大;顶出过程的载荷位移曲线是否会出现平直段,取决于界面层断裂形变的大小。
The bilinear traction-separation model was used to describe the separation characteristic of BN interphase.Based on the experiment procedures,an axisymmetric finite element model with cohesive element was established to simulate the fiber push-out process of SiC_(f)/BN/SiC composite.Moreover,the influence of different critical fracture energy,ultimate strength and thickness of the BN interphase on Force-Displacement curve were considered.Results showed that the value difference of maximum push-out force between simulation and experiment was merely 1.74%,which demonstrates the effectiveness of the established model.The maximum push-out force increases with the increasing critical fracture energy and interphase thickness,but is not sensitive to the ultimate strength.Whether or not a flat segment appears on the Force-Displacement curve depends on the value of interphase fracture displacement.
作者
高晔
束小文
吕晓旭
周怡然
姜卓钰
董禹飞
贺宜红
焦健
GAO Ye;SHU Xiaowen;LV Xiaoxu;ZHOU Yiran;JIANG Zhuoyu;DONG Yufei;HE Yihong;JIAO Jian(National Key Laboratory of Advanced Composites,AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China;Equipment Department of People’s Liberation Army Ground Force,Beijing 100095,China;AECC Hunan Powerplant Research Institute,Zhuzhou 412002,China)
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2022年第3期418-422,共5页
Journal of Materials Science and Engineering
