scholarly journals A simple equivalent plate model for dynamic bending stiffness of three-layer sandwich panels with shearing core

2021 ◽  
pp. 116025
Author(s):  
U. Arasan ◽  
F. Marchetti ◽  
F. Chevillotte ◽  
L. Jaouen ◽  
D. Chronopoulos ◽  
...  
Keyword(s):  
Sandwich Panels ◽  
Bending Stiffness ◽  
Plate Model ◽  
Dynamic Bending

Prediction of Sound Transmission Loss for Finite Sandwich Panels Based on a Test Procedure on Beam Elements

2013 ◽  
Vol 135 (6) ◽  
Author(s):  
Zhongchang Qian ◽  
Daoqing Chang ◽  
Bilong Liu ◽  
Ke Liu
Keyword(s):  
Sandwich Panel ◽  
Transmission Loss ◽  
Test Procedure ◽  
Sandwich Panels ◽  
Sound Transmission ◽  
Expansion Method ◽  
Bending Stiffness ◽  
Sound Transmission Loss ◽  
Modal Expansion ◽  
Beam Elements

An approach on the prediction of sound transmission loss for a finite sandwich panel with honeycomb core is described in the paper. The sandwich panel is treated as orthotropic and the apparent bending stiffness in two principal directions is estimated by means of simple tests on beam elements cut from the sandwich panel. Utilizing orthotropic panel theory, together with the obtained bending stiffness in two directions, the sound transmission loss of simply-supported sandwich panel is predicted by the modal expansion method. Simulation results indicated that dimension, orthotropy, and loss factor may play important roles on sound transmission loss of sandwich panel. The predicted transmission loss is compared with measured data and the agreement is reasonable. This approach may provide an efficient tool to predict the sound transmission loss of finite sandwich panels.

Computational Tool for the Dynamic Analysis of Flexible Risers Incorporating Bending Hysteresis

2007 ◽  
Author(s):  
Russell Smith ◽  
Tommie Carr ◽  
Michael Lane
Keyword(s):  
Production Systems ◽  
New Technology ◽  
Fatigue Loading ◽  
Bending Stiffness ◽  
Analysis Tool ◽  
Flexible Pipe ◽  
Recent Developments ◽  
Dynamic Bending ◽  
Increasing Demand ◽  
Bending Response

Non-bonded flexible-pipe risers provide a structurally compliant solution in offshore floating production systems for the recovery of oil & gas. The bending stiffness of the flexible pipe is an important property in designing the riser system to safely withstand extreme and fatigue loading conditions. These risers have two fundamentally different bending stiffness properties that depend on if the riser system is pressurized or depressurized. A depressurized riser has a comparatively small linear bending stiffness. Most riser designs apply this stiffness as its produces conservative (large) bending responses. In recent years, the bending response predicted from the depressurized bending stiffness has proven overly conservative and there has been an increasing demand to consider the larger hysteretic bending stiffness of the pressurized riser. The objective is to reduce the conservatism and achieve an approved safe design. Recent developments have advanced the modeling of flexible riser bending with hysteresis and this capability has now been incorporated into an industry standard finite-element riser analysis tool. This paper describes the background of hysteresis in relation to non-bonded flexible pipes and outlines the methodology of the riser motions software that incorporates bending stiffness with hysteresis. Riser systems where the dynamic bending response is critical to the success of the design are the main applications that will benefit from this new technology. Examples include: i.) The dynamic bending response at the seabed touchdown of a deepwater catenary riser. ii.) Bending at an interface with the riser hang-off or subsea tie-in.

Parametric study on factors influencing the stiffness of honeycomb sandwich panels using impulse excitation technique

2017 ◽  
Vol 21 (1) ◽  
pp. 115-134 ◽  
Author(s):  
M Phani Surya Kiran ◽  
I Balasundar ◽  
K Gopinath ◽  
T Raghu
Keyword(s):  
Thermal Protection ◽  
Sandwich Panels ◽  
Bending Stiffness ◽  
Bending Test ◽  
Design Stage ◽  
Design Parameters ◽  
Thermal Protection Systems ◽  
Honeycomb Sandwich ◽  
Protection Systems ◽  
Impulse Excitation

Metallic thermal protection systems are used to protect the airframe and pay load from aerodynamic and aerothermal heating in hypersonic cruise vehicles that are powered with advanced scramjet engines. Metallic thermal protection systems is a composite structure that contains honeycomb sandwich panels at the top and bottom and a variety of thermal insulating materials placed in between them. Several design factors influence the structural and thermal performance of the honeycomb sandwich panels. Panel bending stiffness is one important structural property that is generally estimated using a destructive 3-point or 4-point bending test. In this study, a numerical model based on the impulse excitation nondestructive evaluation technique has been developed to estimate the effect of various design parameters that affect the bending stiffness of the honeycomb sandwich panels. The results obtained are analyzed using standard statistical procedures. A major advantage of this method lies in evaluating the panel stiffness at the design stage without resorting to actual fabrication of the panels for destructive testing.

An equivalent plate model for corrugated-core sandwich panels

2015 ◽  
Vol 29 (3) ◽  
pp. 1217-1223 ◽  
Author(s):  
Young-Jo Cheon ◽  
Hyun-Gyu Kim
Keyword(s):  
Sandwich Panels ◽  
Plate Model

scholarly journals BEHAVIOUR OF MINERAL WOOL SANDWICH PANELS UNDER BENDING LOAD AT ROOM AND ELEVATED TEMPERATURES

2020 ◽  
Vol 12 (1) ◽  
pp. 25-31
Author(s):  
Ashkan Shoushtarian Mofrad ◽  
Hartmut Pasternak
Keyword(s):  
Parametric Study ◽  
Elevated Temperatures ◽  
Sandwich Panels ◽  
Mineral Wool ◽  
Bending Stiffness ◽  
Experimental Results ◽  
Fe Model ◽  
Analysis And Design ◽  
Bending Load ◽  
Panel Thickness

This paper presents a parametric study for the bending stiffness of mineral wool (MW) sandwich panels subjected to a bending load. The MW panels are commonly used as wall panels for industrial buildings. They provide excellent insulation in the case of fire. In this research, the performance of sandwich panels is investigated at both ambient and elevated temperatures. To reach that goal, a finite element (FE) model is developed to verify simulations with experimental results in normal conditions and fire case. The experimental investigation in the current paper is a part of STABFI project financed by Research Fund for Coal and Steel (RFCS). The numerical study is conducted using ABAQUS software. Employing simulations for analysis and design is an alternative to costly tests. However, in order to rely on numerical results, simulations must be verified with the experimental results. In this paper, after the verification of FE results, a parametric study is conducted to observe the effects of the panel thickness, length and width, as well as the facing thickness on the bending stiffness of MW sandwich panels at normal conditions. The results indicate that the panel thickness has the most significant effect on the bending stiffness of sandwich panels.

scholarly journals Experimental Study of Dynamic Bending Stiffness of ACSR Overhead Conductors

2015 ◽  
Vol 30 (5) ◽  
pp. 2252-2259 ◽  
Author(s):  
Frederic Levesque ◽  
Sylvain Goudreau ◽  
Sebastien Langlois ◽  
Frederic Legeron
Keyword(s):  
Experimental Study ◽  
Bending Stiffness ◽  
Dynamic Bending

scholarly journals Vibration and Sound Transmission Performance of Sandwich Panels with Uniform and Gradient Auxetic Double Arrowhead Honeycomb Cores

2019 ◽  
Vol 2019 ◽  
pp. 1-16 ◽  
Author(s):  
Qing Li ◽  
Deqing Yang
Keyword(s):  
Transmission Loss ◽  
Sandwich Structures ◽  
Sandwich Panels ◽  
Sound Transmission ◽  
Bending Stiffness ◽  
Mode Shapes ◽  
Sound Insulation ◽  
Transmission Performance ◽  
Constant Weight ◽  
Honeycomb Sandwich

Auxetic mechanical metamaterials that exhibit a negative Poisson’s ratio (NPR) can be artificially designed to exhibit a unique range of physical and mechanical properties. Novel sandwich structures composed of uniform and gradient auxetic double arrowhead honeycomb (DAH) cores were investigated in terms of their vibration and sound transmission performance stimulated by nonhomogeneous metamaterials with nonperiodic cell geometries. The spectral element method (SEM) was employed to accurately evaluate the natural frequencies and dynamic responses with a limited number of elements at high frequencies. The results indicated that the vibrating mode shapes and deformations of the DAH sandwich models were strongly affected by the patterned gradient metamaterials. In addition, the sound insulation performance of the considered DAH sandwich models was investigated regarding the sound transmission loss (STL) from 1 Hz to 1500 Hz under a normal incident planar wave, and this performance was compared with that for hexagonal honeycomb sandwich panels. A programmable structural-acoustic optimization was implemented to maximize the STL while maintaining a constant weight and high strength. The results showed that the uniform DAH sandwich models with larger NPRs generally exhibited better vibration and acoustic attenuation behaviors and that the optimized gradient increasing NPR models yielded higher STL values than the optimized gradient decreasing NPR models for two specified frequency cases, with improvements of 6.52 dB and 2.52 dB and a higher bending stiffness but a lower overall STL. Thus, sandwich panels consisting of auxetic DAHs can achieve desirable vibroacoustic performance with a higher bending stiffness than conventional hexagonal honeycomb sandwich structures, and the design of gradient DAHs can be extended to obtain optimized vibration and noise-control capabilities.

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