Design of Continuous-Density-Graded Porous Metal Materials in Polar Coordinates and Study on the Blast Resistance of Sandwich Tubes
This study investigated the dynamic response of continuous-density-graded aluminum foam sandwich tubes subjected to internal explosion loads.A finite element model for continuous-density-graded aluminum foam and sandwich tubes was established in polar coordinates using 3D-Voronoi technology.The influences of core density distributions,such as positive-gradient,negative-gradient,and V-shaped gradi-ent including middle-high-gradient(high in the middle and low at both ends)and middle-low-gradient(low in the middle and high at both ends),core density gradient,assembly methods of tube walls and the core,and the length-to-diameter ratio of explosives on the anti-shock performance of the sandwich tube structure were analyzed.Results demonstrate that,for the same core density gradient,the maximum deformation of the outer tube in the sandwich tube with a negative-gradient core is the least,while the sandwich tube with a middle-low-gradient core exhibits the highest specific energy absorption,and the sandwich tube with a middle-high-gradient core shows the weakest anti-shock performance.As core density gradient increases,the maximum deformation of the outer tube in the sandwich tube with a negative-gradient core significantly decreases.The specific energy absorption for the sandwich tube with a middle-low-gradient core rises ini-tially before declining,while the anti-explosion performance of the sandwich tube with a middle-high-gradi-ent core deteriorates.Optimal bonding between tube walls and the core effectively improves the specific en-ergy absorption of sandwich tubes with a uniform,negative-gradient,or middle-low-gradient core,but it also increases the maximum deformation of the outer tube.For varying length-to-diameter ratios of explo-sives,the maximum deformation of the outer tube in the sandwich tube with a negative-gradient core is smaller.The present work aims to provide valuable insights for designing such structures for protective engineering applications.
NETL
NSTL
万方数据
