Dynamic Response of Copper Plates Subjected to Underwater Impulsive Loading

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.

Special Issue on Advances in Digital Image Correlation (DIC)

“…More precisely, with regards to applications, in [1], transient kinematic measurements are performed with DIC for the inspection of the in-situ manufacturing of thermoplastic composite materials. The response of copper plates subjected to impulsive loading in complex fluid-structure environment, studied in [2] using high-speed stereo-DIC, illustrates the wide range of time scales that can be addressed by DIC. Along the same line, high-speed camera based DIC was used in [3] to observe ruptures during stick-slip motions of a simulated earthquakes.…”

Visual Methods to Assess Strain Fields in Armour Materials Subjected to Dynamic Deformation—A Review

“…Dai et al [62] studied the response of copper plates subjected to underwater impulsive loading. The plates were made from C11000 copper and had thicknesses of 1 mm, 2 mm and 3 mm.…”

“…Without a pre-notch, the primary failure mode was large ductile deformation, while the pre-notched specimens exhibited four other typical failure modes. These other typical failure modes are large ductile deformation with local necking, splitting, splitting and tearing and fragmentation [62].…”