Linear and Nonlinear Dynamic Analyses of Sandwich Panels with Face Sheet‐to‐Core Debonding

Abstract

A survey of recent developments in the dynamic analysis of sandwich panels with face sheet-to-core debonding is presented. The finite element method within the ABAQUS6 code is utilized. The emphasis is directed to the procedures used to elaborate linear and nonlinear models and to predict dynamic response of the sandwich panels. Recently developed models are presented, which can be applied for structural health monitoring algorithms of real-scale sandwich panels. First, various popular theories of intact sandwich panels are briefly mentioned and a model is proposed to effectively analyse the modal dynamics of debonded and damaged (due to impact) sandwich panels. The influences of debonding size, form, and location and number of such damage incidents on the modal characteristics of sandwich panels are shown. For nonlinear analysis, models based on implicit and explicit time integration schemes are presented and dynamic responses gained with those models are discussed. Finally, questions related to debonding progression at the face sheet-core interface when dynamic loading continues with time are briefly highlighted.

Dynamic characteristic of partially debonded sandwich of ferry ro-ro’s car deck: a numerical modeling

“…In fact, there is no literature which states the spring stiffness value of interface layer of proposed sandwich type. So, in this research, the spring element behavior is assumed to have similar spring stiffness as stated in [5]. In [5], In "with contact" model, the contact behavior is assumed by the free debonding model with setting a zero stiffness (k=0 N/m) to the spring elements so the interfaces can move freely, while a nonzero stiffness value (k=210×10 9 N/m) causes the constrained debonding model between them that restrains the faceplate and the core from moving together [8,9,23].…”

“…Therefore, a reliable assessment technique such as dynamic analysis of such ship structure is necessary to prevent the failures of the structure. The damage state associated with the presence of the debonding can be diagnosed by specific non-destructive damage detection method, i.e., numerical dynamic analysis [5]. This numerical dynamic analysis is usually associated with the use of finite element analysis and has been widely used to assess vibration in many structures [6,7].…”

Application of Sandwich Plate System (SPS) on 155 m Barge: Framing System Confi guration, Weight saving, and Dynamic Characteristic Assessment

“…Various studies on the application of sandwich structures in various ship designs due to static and dynamic behavior and weight-saving analysis were studied [7][8][9][10][11][12][13][14][15][16]. The expansion of knowledge in both practical and scientifi c fi elds shows how the application of sandwich material is distinctly based on the diff erent structural locations and elements.…”

“…The face-core interaction layer is frequently the weakest joint [12]. It is prone to debonding because of the sizable variations in material characteristics and thickness of constitutive materials [13]. It results in signifi cant deformation at the interface layer and internal failure at the outer core material [14], which may compromise the structural integrity [15].…”

Three-Dimensional Free Vibration Analysis of Thermally Loaded FGM Sandwich Plates

“…When debonding arises between the skin and core material layers, sandwich panels significantly lose their load bearing capacity [10,11]. The modal dynamic characteristics of such panels damaged by debonding are changed [12,13,14,15] and their overall dynamic responses are modified [16,17,18,19] as well. Moreover, the debonding may cause eventual failure of the sandwich panels [20,21,22] under dynamic loads.…”