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发布时间：2019-11-06
论文类型：期刊论文
发表时间：2019-09-29
发表刊物：COMPOSITES SCIENCE AND TECHNOLOGY
收录刊物：SCIE、EI
卷号：182
ISSN号：0266-3538
关键字：Bioinspired composites; Fracture toughness; Interfacial strength; Modelling; Finite element analysis (FEA)
摘要：Strength and toughness have been generally deemed as two incompatible properties in many materials. However, balanced toughness and strength have been observed in biomaterials, whose hard and soft phases are arranged into unique and hierarchical architectures. Therefore, it is necessary to understand the underpinning toughening mechanisms and develop reliable procedures that can mimic these unique structures at different length scales. Here, alumina-Poly(methyl methacrylate) (PMMA) composites were prepared using freeze casting combined with interface modification (silanization treatment). High failure strain (similar to 4.5%) is achieved in these composites. The overall toughness can be tailored through modifying the interfacial strength between alumina and PMMA. A weaker interface (similar to 8 MPa) leads to a greater toughness (3.1 MPa m(1/2)), which is even greater than the constituent phases, i.e., alumina (2.71 MPa m(1/2)) and PMMA (1.1 MPa m(1/2)). Using a cohesive zone model and extended finite element method (XFEM), the toughening mechanism has been investigated.