Proceedings of the Thirty-second (2022) International Ocean and Polar Engineering Conference
Shanghai, China, June 5–10, 2022
Copyright © 2022 by the International Society of Offshore and Polar Engineers (ISOPE)
ISBN 978-1-880653-81-4; ISSN 1098-6189

www.isope.org

Dynamic responses of aluminum honeycomb sandwich plate under slamming loadings
Dong Liu1, Ling Zhu1,2, Kailing Guo1,2,*, Zhikui Zhu1, Shanshan Guo1
1 Key Laboratory of High Performance Ship Technology (Wuhan University of Technology), Ministry of Education, Wuhan, P.R. China;
2 Departments of Naval Architecture, Ocean and Structural Engineering, School of Naval Architecture, Ocean and Energy Power Engineering, Wuhan
University of Technology, Wuhan P.R. China;

Cecchini and Yusif (2019) presented a hybrid computational-empiricalfatigue failure prediction model for shear failure dominated foam core
sandwich hull structures subjected to variable water slamming
conditions, and found that the sandwich panel fatigue life showed asignificant reduction with increasing impact velocity and decreasing
deadrise angle. Wang and Cheng (2020) conducted experiments andsimulations to investigate the hydroelastic behaviours of laser-welded
lightweight corrugated sandwich panels subjected to water impact. Heand Cui (2021) studied the influence of slamming velocity and deadrise
angle on hydrodynamic response based on Coupled EulerianLagrangian (CEL) method.

ABSTRACTThe aluminum honeycomb sandwich plates (AHSP) have been widelyused in marine applications due to their excellent properties such as
high strength/weight ratio. In the present study, the dynamic responseof aluminum honeycomb sandwich plates under slamming loadings isinvestigated. The experimental apparatus are designed for the slamming
tests. The time history curves of slamming pressure and strain areobtained, and their characteristics are discussed. Besides, thedeformation profiles of the face sheets of AHSP are measured, fromwhich the deformation modes are examined.

In this paper, the drop tests of honeycomb sandwich plates were carriedout to investigate the pressure characteristics in the process of water
entry and the deformation response under slamming loadings.

KEY WORDS:

honeycomb sandwich plate; slamming pressure;dynamic response; deformation.

INTRODUCTION

SPECIMEN INTRODUCTION

When ships travel with high speed in rough sea, they will be subjectedto the slamming loadings, which may cause damage to hull structures.
Therefore, many researchers have performed investigations on
slamming loads and structural response due to slamming. On the other
hand, the sandwich structures have been widely used in the industry
due to their excellent mechanic performance and capacity of energy
absorption.

Sandwich plate is made of face sheets and honeycomb core, as shownin Fig. 1. The face sheets, with a thickness of 1 mm, are 350 * 350 mm,
and the actual impact region is 250 * 250 mm. The core is hexagonal
honeycomb with a size of 250 * 250 * 15 mm. And the side length andthickness of the core cell are 8 mm and 0.04 mm, respectively. The
material properties for the core and face sheets are shown Table 1.
In order to study the dynamic response of sandwich plate underslamming loadings, the slamming pressure and strain were measured bypressure sensors and strain gauges, respectively. Two pressure sensors
were mounted on the lower plate to measure the pressure of wet surface,and a strain gauge was pasted on the upper plate to measure the strainof dry surface. The distribution of pressure sensors and strain gauge isshown in Fig. 2. And the data of pressure and strain were obtained bym+p VibMobile and TMR-211 data acquisition instruments,respectively. The m+p VibMobile is made by m+p international, which
can receive voltage signals. And the TMR-211 is a dynamic strainindicator.

Qin and Batra (2009) developed a hydroelastic model based on a {3,2}order sandwich composite panel theory and Wagner’s water impact
theory for investigating the fluid–structure interaction during theslamming process. Ray and Batra (2013) carried out dynamic failure
analysis to investigate the initiation and cause of the failure of beams
due to slamming loads. Xiao and Batra (2014) used the boundary
element method and the finite element method to study thedelamination in a sandwich plate. And the results showed that thedelamination reduced the hydroelastic pressure on the surface of thepanel and changed the deformation of the panel. Allen and Battley(2015) conducted a range of experiments to study the distribution of thepressure on the flexible composite hull panels with a deadrise angle of10°. Hassoon and Tarfaoui et al. (2017a,2017b,2018,2019)
experimentally and numerically studied the sandwich panels withpolymeric skins and PVC foam cores subjected to slamming impact.

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