Elastic and fracture behavior of three-dimensional ply-to-ply angle interlock woven composites: Through-thickness, size effect, and multiaxial tests
Elastic and fracture behavior of three-dimensional ply-to-ply angle interlock woven composites: Through-thickness, size effect, and multiaxial tests
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DOI：
10.1016/j.jcomc.2020.100098
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发表时间：
2020-12
期刊：
影响因子：
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通讯作者：
Weixin Li;Yao Qiao;J. Fenner;K. Warren;M. Salviato;Z. Bažant;G. Cusatis
中科院分区：
文献类型：
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作者：
Weixin Li;Yao Qiao;J. Fenner;K. Warren;M. Salviato;Z. Bažant;G. Cusatis
本文对角互锁三维机织复合材料的弹性和断裂行为进行了全面的研究。该研究调查了新的分裂和楔形驱动的面外断裂试验，以揭示在厚度方向上的拉伸断裂行为，并提供面外拉伸强度和断裂能的估计。此外，几何缩放的单边缺口拉伸（SENT）试样的尺寸效应测试进行充分表征的材料的层内断裂能，并研究在这种类型的三维复合材料的结构强度的缩放。结果表明，尺寸效应对材料的结构强度有显著影响。事实上，即使研究的尺寸范围比以往任何传统的层压复合材料和二维纺织复合材料的尺寸效应研究更广泛，所有的实验数据都落在准韧性和脆性行为之间的过渡区。这意味着所研究的三维复合材料具有很强的损伤容限。通过Bažant的II型尺寸效应定律（SEL）对数据进行分析，首次实现了三维复合材料层内断裂能的客观表征。最后，Arcan台架试验结合X射线微计算机断层扫描，允许在多轴标称载荷条件下，特别是张力为主和剪切为主的条件下，不同的损坏机制前所未有的见解。
This work presents a comprehensive investigation of the elastic and fracture behavior of ply-to-ply angle interlock three-dimensional woven composites. The research investigated novel splitting and wedge-driven out-of-plane fracture tests to shed light on the tensile fracture behavior in the thickness direction and to provide estimates of the out-of-plane tensile strength and fracture energy. In addition, size effect tests on geometrically-scaled Single Edge Notch Tension (SENT) specimens were performed to fully characterize the intra-laminar fracture energy of the material and to study the scaling of structural strength in this type of three-dimensional composites. The results confirmed that size effect in the structural strength of these materials is significant. In fact, even if the range of sizes investigated was broader than in any previous size effect study on traditional laminated composites and two-dimensional textile composites, all the experimental data fell in the transition zone between quasi-ductile and brittle behavior. This implies strong damage tolerance of the investigated three-dimensional composites. The analysis of the data via Bažant’s Type II Size Effect Law (SEL) enabled the objective characterization of the intra-laminar fracture energy of three-dimensional composites for the first time. Finally, Arcan rig tests combined with X-ray micro-computed tomography allowed unprecedented insights on the different damage mechanisms under multi-axial nominal loading conditions, particularly tension-dominated and shear-dominated conditions.