Effect of combined gradation in cross-sectional area and density on the dynamic compressive behavior of foams for moderate impact velocities. (September 2022)

• Record Type: Journal Article
• Authors: Rapaka, Sri Datta; Pandey, Manoj; Annabattula, Ratna Kumar
• Is Part Of: Mechanics of materials. Volume 172(2022)
• Publication Date: 2022-09
• Subjects: Functionally graded foams -- Combined-gradation -- Quadruple-shock -- Energy absorption -- Dynamic compression -- Voronoi honeycomb; Strength of materials -- Periodicals; Mechanics, Applied -- Periodicals; Résistance des matériaux -- Périodiques; Mécanique appliquée -- Périodiques; Mechanics, Applied; Strength of materials; Periodicals; Electronic journals; 620.11
• DOI: 10.1016/j.mechmat.2022.104381
• Languages: English
• ISSNs: 0167-6636

Abstract

Abstract: The effect of combined gradation in area and density on the dynamic response of foams is studied in this work. The cross-sectional area and density are graded such that the product of these quantities results in a tri-linear variation along the foam's length, and hence, the foam type is designated as Type-TL. A theoretical model based on the R-PP-L idealization is developed to study the response of the Type-TL foam struck by a rigid projectile. The Type-TL foam offers force distribution over a considerably larger area than a homogeneous foam, which may benefit structural protection. Graphical abstract: Highlights: A quadruple shock mode is observed in the stationary impact of Type-TL foam. Four shock fronts and four phases exist in the two deformation types of the Type-TL foam. Increasing the area-ratio of Type-TL foam lowers force transmission. Decreasing the density-ratio of Type-TL foam lowers the peak force transmitted. Type-TL foam transmits the least distal end force per unit mass and cross-sectional area.