材料科学
复合材料
偏转(物理)
断裂韧性
韧性
剪切(地质)
消散
断裂力学
增韧
胶粘剂
有限元法
复合数
结构工程
工程类
物理
图层(电子)
光学
热力学
作者
Lianhao An,Xiaodong Wei,Ke Wang,Runzhi Li,Zhiqiang Li,Guoqiang Li
标识
DOI:10.1016/j.ijmecsci.2023.108388
摘要
The crack modes and toughening strategies of 3D printed double-helicoidal (DH) composites were fully characterized by performing quasi-static three-point bending experiments and simulations. Notch-containing DH specimens were fabricated with dual-material curing 3D printer PolyJet technology, while single-helicoidal (SH) specimens were also prepared for comparison. The rigid glassy polymer VeroWhite and the soft rubbery polymer TangoBlackPlus were selected as the brick and adhesive of the specimens, respectively. First, the crack propagation path of the specimens under three-point bending loading was observed, and the fracture toughness and critical deformation displacements were calculated. The double twisting pattern of DH composite makes cracks deflect along complex deflection paths, resulting in increased energy dissipation required to produce deflected crack surfaces, which delays catastrophic damage. Then, the deformation and interlayer stress distribution under static loading were analyzed by finite element analysis. It was found that the interlaminar shear stresses σ13 and σ23 generated in adjacent layers were responsible for the crack deflection of the DH specimens. Toughening mechanisms of the DH structure inspired by coelacanth will promote the design of next generation fracture-resistant composites.
科研通智能强力驱动
Strongly Powered by AbleSci AI