Fracture behavior and strain evolution of laminated composites
Fracture behavior and strain evolution of laminated composites
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层合复合材料的断裂行为和应变演化
DOI：
10.1016/j.compstruct.2016.12.036
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发表时间：
2017-03-01
影响因子：
6.3
通讯作者：
Peng, Guanyun
中科院分区：
文献类型：
--
作者：
Wu, Hao;Fan, Guohua;Peng, Guanyun
制备了由 TiBw/Ti 和 Ti(A1) 交替层组成的层状复合材料，其表现出优异的断裂伸长率，比块状 TiBw/Ti 复合材料高出近 20 倍。 TiBw/Ti-Ti(A1)层状复合材料的二维和三维耦合断裂特征显示出明显的断裂特征，包括裂纹分布、隧道裂纹的形成和裂纹扩展的抑制。这些实验观察到的断裂特征与原位监测的应变演化过程密切相关，通过该过程我们观察到层状结构有效地抑制了应变局部化，从而降低了裂纹尖端附近的应力强度以及裂纹扩展的驱动力。因此，层状复合材料对早期裂纹不太敏感，并且表现出良好的强度-延展性组合。 (C) 2016 Elsevier Ltd. 保留所有权利。
Laminated composites consisting of alternating layers of TiBw/Ti and Ti(A1) were prepared, and exhibited a superior elongation to fracture that is nearly 20 times higher than that of bulk TiBw/Ti composites. Coupling two- and three-dimensional fracture characterizations of TiBw/Ti-Ti(A1) laminated composites show distinct fracture characteristics including crack distribution, formation of tunnel cracks, and suppression of crack propagation. These experimentally observed fracture characteristics are intimately correlated with in situ monitored strain evolution process, by which we observed that strain localization is effectively suppressed by laminated structure, thus lowering the stress intensity near the crack tip as well as the driving force for crack propagation. As a consequence, laminated composites are not so sensitive to the early cracking, and exhibit a good strength-ductility combination. (C) 2016 Elsevier Ltd. All rights reserved.