【摘要】 用实验、有限元及理论分析相结合方法对金属面夹芯板抗冲击性能进行研究。用实验方法研究金属面夹芯板在落锤冲击下的动力性能及破坏情况,并用有限元方法对实验进行模拟分析,验证有限元计算方法的适用性;用理论方法对夹芯板局部变形进行分析,将局部变形势能与外力功建立体系总势能,用势能驻值原理获得集中力与局部变形关系,以面板拉伸断裂为破坏条件,获得夹芯板开裂冲击力;建立有限元模型计算夹芯板开裂破坏时的冲击力,并与公式计算值比较。分析表明,夹芯板开裂冲击力随面板强度、厚度及锤头半径、开裂应变的增加而增大,落锤质量、芯材强度、芯材厚度对开裂冲击力基本无影响。更多还原

【Abstract】 Tests,finite element simulations and theoretical analysis were performed here to study the impact resistance performance of metallic sandwich panels under low velocity impact. Firstly,the dynamic performance and damage situation of metallic sandwich panels under dropping hammer impact were analyzed with tests. Finite element method was used to simulate tests,and the applicability of finite element analysis was verified. Then,the total potential energy of the system was established with local deformation potential energy and external force work. The relationship between the concentrated force and local deformation was also obtained. The cracking impact force of the sandwich panels was obtained taking the tensile fracture of face sheets as the failure condition. Finally,the finite element model was established to calculate the cracking impact force of the panels,and the results were compared with those using the formula. It was shown that the cracking impact force of the panels increases with increase in strength and thickness of the face sheets,hammer radius and cracking strain,but hammer mass,strength and thickness of the core have little effect on the cracking impact force.更多还原