摘要
研究目的:通过准静态到动态的加载,研究以不锈钢点阵结构为芯材的夹芯结构的层间断裂韧性。创新要点:制备的夹芯结构不需要黏合剂,但是具有优异的面板-芯材界面性能;证明改良后的三点弯曲实验可用于研究夹芯结构在低速冲击下的界面性能。研究方法:采用改良后的三点弯曲实验(见图2)测试夹芯结构的面板-芯材断裂韧性;采用低速冲击来测试夹芯结构的抗分层性能(见图5)和吸收能量性能(见图8)。重要结论:1.采用热压法制备的以碳纤维增强环氧树脂预浸料为面板,不锈钢点阵结构为芯材的夹芯结构不需要任何粘合剂;2.所得夹芯结构在受到准静态和动态三点弯曲加载时展现了优异的抗面板-芯材界面分层性能,断裂能达到5500 J/m2;3.改良的三点弯曲实验可以用于测试低速冲击条件下夹芯结构的断裂性能。
The aim of this study is to characterize the interfacial fracture toughness of a micro-lattice core based sandwich structure from quasi-static to dynamic rates of loading. The modified three-point bend （MTPB） sandwich beam was used to characterize the interfacial properties of these sandwich structures. Dynamic tests were undertaken of up to 3 m/s using a purpose-built instrumented drop-weight impact tower. Data reduction was accomplished through the use of a compliance cali- bration procedure similar to that used for characterizing the delamination resistance of composites. The flexural properties of sandwich beams were investigated through three-point bend tests at a cross-head displacement rate of up to 3 m/s. A detailed examination of the impact region highlighted the failure processes in these systems and this was related to the data from the quasi-static flexural tests. The globalized deformation and energy absorption during progressive were also discussed.
基金
Project supported by the Engineering and Physical Sciences Research Council(EPSRC)(No.EPSRC EP/C009525/1)of China
the China Postdoctoral Science Foundation(No.2011M500625)
关键词
夹芯结构
层间断裂韧性
弯曲性能
Sandwich structure, Interfacial fracture toughness, Flexural property
