Dynamic response of stiffened plates under repeated impacts

Influence of tool speed movement during cutting honeycomb block on its vibration resistance and cutting accuracy

“…The method of cutting blanks from a honeycomb sheet, when a cutting tool is made in the form of a thin blade, performed in the direction normal to the surface to be treated, the plunge, which is accompanied by the impact of the cutting edge on the cell wall of the honeycomb, is associated with difficulties in rectilinear movement due to vibrations [1] and as a result of elastic deformations. Manifestation of the coordinate relationship is that under the action of the cutting force, the top of the cutting tool blade is generally displaced not only in the direction of cutting, but also in the perpendicular direction to it [2]. When cutting the wall of a honeycomb block, the top of the cutting edge of the cutting tool is in conditions of all-round compression, where any movements other than tangential are constrained.…”

Multiple ballistic impacts of thin metallic plates: Numerical simulation

“…24 In the present study, the damping effect was applied to the target plate to mimic the actual impact experiment 23 such that the plate after impact could quickly approach a stable equilibrium state. 27 Specifically, the method of massweighted nodal damping was adopted wherein the damping factor was calculated from the first-order natural frequency of the target plate. 28 Contact between the impacting projectiles and the target plate was defined as ERODING_ SURFACE_TO_SURFACE, with penalty contact formulation adopted and the dynamic coefficient of friction specified as 0.57.…”

A Pioneer of Impact Engineering

“…He continued with his research interest in naval architecture and ocean engineering and studied the grounding of ships and ship collisions [22,23], aspects of the behavior of ice loadings [24,25], including introducing a dimensionless ice number [26], slamming loads [27], the strength of wire ropes [28][29][30], and the impact response of pipelines with and without an internal pressure [31][32][33]. The pseudo-shakedown phenomenon, which he defined in [9], was used to study the response of the bottom plating of a ship's hold when subjected to repeated impact loadings from cargo [34] and has been explored for stiffened plates under repeated impact loadings [35] and further explored recently to examine the shakedown characteristics of a Suezmax-class double-hull oil tanker with Paik [36]. Some of these studies have been have been summarized in the Transactions of RINA [37] A wide range of topics associated largely with the dynamic plastic response of structural problems were studied with a succession of outstanding graduate students and visitors over the subsequent 26 years.…”