Abstract
Understanding the mechanical response and failure behaviors of thin plates under impact loading is helpful for the design and improvement of thin plate structures in practical applications. The response of a copper plate subjected to underwater impulsive loading has been studied in fluid-structure interaction (FSI) experiments. Three typical copper plates, (a) without a pre-notch, (b) with a cross-shaped pre-notch (+), and (c) with a ring-shaped pre-notch (○) were selected. A high-speed photography system recorded the full-field shape and displacement profiles of the specimens in real time. The 3D transient deformation fields’ measurements were obtained using a 3D digital image correlation (DIC) technique. Strain results from DIC and the strain gauges technique were in good agreement. A dimensionless deflection was used to analyze the effect of plate thickness and loading intensity on the deformation of the copper plates. The typical failure modes of different copper plates were identified. The test plates exhibited large ductile deformation (mode I ) for copper plates without a pre-notch, and large ductile deformation with local necking (mode I c ), splitting (mode II ), splitting and tearing (mode II c ), and fragment (mode III ) for the copper plate with a pre-notch.
Highlights
Flat-panel structures that are widely used in naval assets and warships are sometimes affected by underwater explosions (UNDEX) because of, for example, torpedo attacks [1]
This paper presents the transient responses and failure modes of clamped copper plates subjected subjected to underwater shock loading
Experimental non-linear responseslabeled of circular copper plates in the shape of the pre-notch influences the failure mode of the subjected to underwater impulsive loading using a fluid-structure interaction experimental setup circular plate under to underwater loading
Summary
Flat-panel structures that are widely used in naval assets and warships are sometimes affected by underwater explosions (UNDEX) because of, for example, torpedo attacks [1]. In the design and application of ships, small curvature hull panels with welded stiffeners can be considered flat-panels [2]. Experimental and computational methods have been used to investigate the dynamic response of plate structures with different geometric dimensions and materials. The response of these structures to dynamic loading is not well understood. Due to high deformation rates and their corresponding short loading times and material nonlinearity, the structural dynamic response caused by an UNDEX is complex. It is difficult to accurately measure deformation fields in the dynamic response process of a metal plate subjected to underwater impulsive loading
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