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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。
Research purposes: The interlaminar fracture toughness of sandwich structure with stainless steel lattice structure as core material was studied through quasi-static to dynamic loading. Innovative Points: The prepared sandwich structure does not require adhesives, but has excellent panel-core interface properties. It proves that the modified three-point bending test can be used to study the interface performance of the sandwich structure under low-speed impact. Research Methods: The panel-core fracture toughness of the sandwich structure was tested using the modified three-point bending test (see Figure 2); the delamination resistance of the sandwich structure (see Figure 5) and energy absorption performance (See Figure 8). Important conclusions: 1. The sandwich structure with the carbon fiber reinforced epoxy resin prepreg prepared by the hot pressing method and the stainless steel lattice structure as the core material does not need any adhesive; 2. The obtained sandwich structure is subjected to the standard Static and dynamic three-point bending load exhibits excellent resistance to the delamination performance of the panel-core interface, breaking energy can reach 5500 J / m2; 3. Improved three-point bending test can be used to test the sandwich structure under low impact conditions Fracture performance.