Indentation into an aluminium panel by the impact of a rigid spherical object. (November 2022)

• Record Type: Journal Article
• Authors: Shi, Shuangmin; Lam, Nelson; Cui, Yiwen; Zhang, Lihai; Lu, Guoxing; Gad, Emad
• Is Part Of: Thin-walled structures. Volume 180(2022)
• Publication Date: 2022-11
• Subjects: Permanent indentation -- Aluminium cladding -- Impact -- Projectile -- Spatial variation; Thin-walled structures -- Periodicals; 690.1
• DOI: 10.1016/j.tws.2022.109935
• Languages: English
• ISSNs: 0263-8231

Abstract

Abstract: This paper introduces algebraic expressions for determining the amount of permanent indentation caused to an aluminium panel when impacted by a rigid spherical object. The magnitude of indentation is observed to vary significantly with the position of impact within the panel when the impactor and the velocity of impact are kept the same. This spatial variation of indentation is caused by the changes in the combinational mass (which is in turn function of the participating mass of the plate) and the Coefficient of Restitution C O R . Both parameters are shown to correlate with the position of impact. The proposed algebraic expression featuring the combinational mass and C O R as input parameters, allows potential damage to the panel to be predicted conveniently in day-to-day engineering practices. The original contribution of this article is in illustrating this phenomenon analytically, and have the analytical predictions verified by impact experimentation which has been conducted by the authors on panels of varying dimensions. Highlights: Expressions for estimating indentation into an aluminium panel are presented. Indentation is sensitive to impact location, impactor size and panel thickness. Observed phenomenon can be explained by change in participation mass. Accuracy of predictions validated by impact experimentation.