摘要
基于六边形和内凹形两种基本构型,采用实验测试和有限元仿真的方法,对三点弯曲作用下层合多孔结构裂纹扩展规律进行了研究,讨论了胞元铺设方向的角度对层合多孔结构破坏形式、承载力和变形的影响。结果表明,双层模型的裂纹扩展路径会向裂纹扩展抑制能力较弱层的裂纹扩展路径偏转;强度低的一侧会发生更大的变形,从而导致模型向强度高的一侧偏转;在一些角度组合下,双层模型承载力和韧性相较于对应的单层模型有明显提升。
Based on two basic configurations of hexagonal and inner concave shapes,by utilizing experimental test and finite element simulation method,the crack expansion law of laminated porous structures under three-point bending was studied,the influence of cellular element angle of laying direction on failure mode,load capacity,and deformation of the laminated porous structures was discussed.The results indicate that the crack expansion path in the bilayer model deviates towards the weaker layer with less crack expansion inhibition capability.The weaker side experiences greater deformation,leading to a deviation of the model towards the stronger side.Under certain angle combinations,the bilayer model shows significantly improved load-bearing capacity and toughness compared to the corresponding single-layer model.
作者
许爽
邓庆田
李旺斐
李新波
宋学力
温金鹏
XU Shuang;DENG Qingtian;LI Wangfei;LI Xinbo;SONG Xueli;WEN Jinpeng(School of Sciences,Chang’an University,Xi’an 710064,China;Xi’an Key Laboratory of Digital Detection Technology for Structure Damage,Chang’an University,Xi’an 710064,China;Institute of Systems Engineering,China Academy of Engineering Physics,Mianyang 621900,China)
出处
《机械强度》
北大核心
2025年第2期28-36,共9页
Journal of Mechanical Strength
基金
国家自然科学基金委员会-中国工程物理研究院NSAF联合基金项目(U1930204)。
关键词
层合多孔结构
三点弯曲实验
裂纹扩展
聚乳酸材料
Laminated porous structure
Three-point bending experiment
Crack expansion
Polylactic acid LA material
