Fracture behavior and strain evolution of laminated composites

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• 作者：Hao Wu^a ; Guohua Fan^a ; ^{ghfan@hit.edu.cn} ; Meng Huang^a ; Lin Geng^a ; Xiping Cui^a ; Rongchang Chen^b ; Guanyun Peng^b
• 关键词：Laminated structures ; Image analysis ; Fracture ; Strain delocalization ; Digital image correlation (DIC)
• 刊名：Composite Structures
• 出版年：2017
• 出版时间：1 March 2017
• 年：2017
• 卷：163
• 期：Complete
• 页码：123-128
• 全文大小：2369 K
• 卷排序：163

文摘

Laminated composites consisting of alternating layers of TiBw/Ti and Ti(Al) 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(Al) 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.