scholarly journals Polymer Foam Core Aluminum Sandwich Lightweight Car Hood for Pedestrian Protection

2018 ◽  
Vol 134 (1) ◽  
pp. 231-234
Author(s):  
Y. Can ◽  
M. Yazıcı ◽  
H. Güçlü
Keyword(s):  
Foam Core ◽  
Pedestrian Protection ◽  
Polymer Foam

Creep Responses of Smart Sandwich Composites at Multiple Length Scales: Experiments and Modeling

2010 ◽  
Vol 133 (1) ◽  
Author(s):  
Anaïs Farrugia ◽  
Charles Winkelmann ◽  
Valeria La Saponara ◽  
Jeong Sik Kim ◽  
Anastasia H. Muliana
Keyword(s):  
Creep Behavior ◽  
Composite Structures ◽  
Effective Properties ◽  
Micromechanical Model ◽  
Foam Core ◽  
Sandwich Beams ◽  
Fiber Reinforced ◽  
Polymer Foam ◽  
Creep Tests ◽  
Unique Challenge

In service, composite structures present the unique challenge of damage detection and repair. Piezoelectric ceramic, such as lead zirconate titanate (PZT), is often used for detecting damage in composites. This paper investigates the effect of embedded PZT crystals on the overall creep behavior of sandwich beams comprising of glass fiber reinforced polymer laminated skins and polymer foam core, which could potentially be used as a damage-detecting smart structure. Uniaxial quasi-static and creep tests were performed on the glass/epoxy laminated composites having several fiber orientations, 0 deg, 45 deg, and 90 deg, to calibrate the elastic and viscoelastic properties of the fibers and matrix. Three-point bending creep tests at elevated temperature (80°C) were then carried out for a number of control sandwich beams (no PZT crystal) and conditioned sandwich beams (with PZT crystals embedded in the center of one facesheet). Lateral deflection of the sandwich beams was monitored for more than 60 h. The model presented in this paper is composed by two parts: (a) a simplified micromechanical model of unidirectional fiber reinforced composites used to obtain effective properties and overall creep response of the laminated skins and (b) a finite element method to simulate the overall creep behavior of the sandwich beams with embedded PZT crystals. The simplified micromechanical model is implemented in the material integration points within the laminated skin elements. Fibers are modeled as linear elastic, while a linearized viscoelastic material model is used for the epoxy matrix and foam core. Numerical results on the creep deflection of the smart sandwich beams show good correlations with the experimental creep deflection at 80°C, thus proving that this model, although currently based on material properties reported at room temperature, is promising to obtain a reasonable prediction for the creep of a smart sandwich structure at high temperatures.

A new crushable foam model for polymer-foam core sandwich structures

2021 ◽  
pp. 1-21
Author(s):  
Xiaolong Tong ◽  
Michelle S. Hoo Fatt ◽  
Anudeep Reddy Vedire
Keyword(s):  
Sandwich Structures ◽  
Foam Core ◽  
Polymer Foam ◽  
Foam Model

scholarly journals Impact Loading Performance of Polymer Foam Core Aluminium Sandwich Panels

2019 ◽  
Vol 135 (4) ◽  
pp. 769-771
Author(s):  
Y. Can ◽  
H. Güçlü ◽  
İ. K. Türkoğlu ◽  
İ. Kasar ◽  
M. Yazıcı
Keyword(s):  
Impact Loading ◽  
Sandwich Panels ◽  
Foam Core ◽  
Polymer Foam

Interfacial delamination in glass-fiber/polymer-foam-core sandwich composites using singlemode–multimode–singlemode optical fiber sensors: Identification based on experimental investigation

2017 ◽  
Vol 22 (1) ◽  
pp. 40-54 ◽  
Author(s):  
Nilanjan Mitra ◽  
Alak K. Patra ◽  
Satya P Singh ◽  
Shyamal Mondal ◽  
Prasanta K Datta ◽  
...  
Keyword(s):  
Glass Fiber ◽  
Side Surface ◽  
Cost Effective ◽  
Fiber Optic Sensor ◽  
Sandwich Composite ◽  
Foam Core ◽  
Sandwich Composites ◽  
Strain Sensing ◽  
Polymer Foam ◽  
Interfacial Delamination

Identification of interfacial delamination in the glass fiber/polymer-foam-core sandwich composites is difficult if the delamination does not propagate to the side surface of the specimen. However, these damages may eventually lead to compromising the sandwich composite structural component. A cost-effective novel embedded fiber optic sensor is being proposed in this manuscript, which works on the principle of multimode interference, to perform distributed sensing of interfacial delamination within the sandwich composites while in service. Even though this easy to use methodology has been used to identify interfacial delamination, this methodology can also be used for different other types of interfacial/interlaminar distributed strain sensing of samples under mechanical as well as thermal loads.

Analytical and numerical investigations on the penetration of rigid projectiles into the foam core sandwich panels with aluminum face-sheets

2017 ◽  
Vol 233 (1) ◽  
pp. 285-298
Author(s):  
A Alavi Nia ◽  
M Kazemi
Keyword(s):  
Analytical Method ◽  
High Speed ◽  
Aluminum Foam ◽  
Metal Foam ◽  
Sandwich Panels ◽  
Foam Core ◽  
Polymer Foam ◽  
High Speed Impact ◽  
Mathematical Equations ◽  
Density Ratios

The aim of this study was to evaluate the penetration of ballistic projectiles into the sandwich panels both analytically and numerically. Due to the complexity of the mathematical equations governing this phenomenon, very few analytical studies have been conducted in this area. Given the widespread use of sandwich panels consisting of metal face-sheets and metal foam core in aerospace industries, revisions are carried out on analytical method provided by Hoo Fatt et al. on polymer foam core and composite face-sheets sandwich panels. Then using the improved relations, the high speed impact of a cylindrical projectile on the sandwich panels with aluminum face-sheets and aluminum foam core with different density ratios has been discussed. Also, the penetration process is simulated and finally to evaluate the accuracy of the improved analytical method and simulations, the results are compared to the experimental data obtained from tests have been done on the panels with aluminum foam core and aluminum face-sheets. Results of the research show that the improved procedure and numerical simulations are in good agreement with the experiments.

Light Weight Sandwich Panels for Yacht Hull Structures

2005 ◽  
Author(s):  
M. C. Rice ◽  
C. A. Fleischer ◽  
D. D. R. Cartie ◽  
Marc Zupan
Keyword(s):  
Carbon Fiber ◽  
Sandwich Structures ◽  
Material Selection ◽  
Sandwich Panels ◽  
Material Behavior ◽  
Face Sheet ◽  
Foam Core ◽  
Light Weight ◽  
Polymer Foam ◽  
Out Of Plane

Improving lightweight structures is a continuous challenge for yacht hull structural components. Sandwich beams consisting of strong face sheets and a low density core have gained application as weight efficient structures subjected to bending loads. The sandwich structure provides good stiffness by keeping the face sheets at a fixed distance with considerable weight reduction over a statically equivalent monolithic panel. New fabrication technologies now allow for hybrid sandwich structures, known as X-cor to be manufactured. X-cor panels consist of carbon fiber face sheets separated by a closed cell polymer foam core reinforced with carbon fiber or metallic (Titanium or Steel) pins. The pins are inserted into the light weight foam core in the out-of-plane direction and extend from face sheet to face sheet. Pin orientation and concentration can be varied providing a large design space for scientist and designer to explore and to improve material performance. The effect of core thickness, pin reinforcing and polymer foam core on the out-of-plane axial compression response of these panel will be presented. The through thickness three- point simply supported bending behavior of these reinforced panels is used to evaluate the core shear, stretch, face sheet failure characteristics of the structures. Explicit experimental observations are used to develop and calibrate analytical energy balance models to generate failure mode maps describing the panel collapse load as a function of geometry. Multi-scale effective modeling, blurring the distinction between structural and material behavior, will enable optimization of the X-cor sandwich structures in light of Yacht hull design requirements. The mechanical response of X-cor sandwich panels will be compared to current Yacht hull materials using material selection charts, and demonstrator components presented.

scholarly journals Analyses of Deformation in Viscoelastic Sandwich Composites Subject to Moisture Diffusion

2008 ◽  
Author(s):  
Nikhil P. Joshi ◽  
Anastasia H. Muliana
Keyword(s):  
Dimensional Stability ◽  
Structural Characteristics ◽  
High Strength ◽  
Moisture Diffusion ◽  
Peel Strength ◽  
Sandwich Composite ◽  
Foam Core ◽  
Sandwich Composites ◽  
Polymer Foam ◽  
Effect Of Moisture

Sandwich composites with polymer foam core are currently used in load-bearing components in buildings and naval structures due to their high strength to weight and stiffness to weight ratios, excellent thermal insulation, and ease of manufacturing. During their service time, sandwich composites are exposed to various external mechanical and hygro-thermal stimuli. It is known that the constituent properties of the sandwich composites are greatly influenced by the temperature and moisture fields. Granville [1] conducted experiments to study the effect of moisture on structural, dimensional stability, weight gain and peel strength of sandwich composites. Morganti et al. [2] analyzed the effect of moisture on the dimensional stability of the sandwich composites and concluded that moisture affects the physical behavior of the composite directly by modifying its structural characteristics such as matrix degradation and microcracks between fiber and matrix etc. However, the effect of moisture on the deformations in the sandwich composite with the viscoelastic foam cores has not yet been studied. The time-dependent response of the sandwich composite (due to the viscoelastic foam core) is aggravated in the moist environment conditions. Thus, it becomes necessary to analyze the effect of moisture on the overall response of the sandwich composites.

Sandwich Elements from Renewable Resources as a Structural Component in the Architecture

2015 ◽  
Vol 825-826 ◽  
pp. 1071-1079
Author(s):  
Andreas Krombholz ◽  
Peter Werner ◽  
Andreas Weber
Keyword(s):  
Thermal Insulation ◽  
Renewable Resources ◽  
Phenolic Resin ◽  
Beech Wood ◽  
Natural Fibre ◽  
Foam Core ◽  
Polymer Foams ◽  
Polymer Foam ◽  
Load Carrying ◽  
Sandwich System

The necessary thermal insulation for buildings was provided for years optimally by polymer foams. Generally the foam is based on petrochemical resources. It is used for external wall insulation and not employed for additional functions. A Sandwich build of rigid laminates and a quite shear resistant polymer foam core results in an extraordinary stiff element. This provides thermal insulation and forms an independent load carrying structure. The sustainability of the sandwich structure can be raised by combining materials from renewable resources. The sandwich system currently developed, in cooperation with our partner from industries C3 Technologies, consists of lignin based foams of varying density and natural fibre reinforced laminates. The lignin is produced from beech-wood via the organosolv-process. Afterwards it is chemically integrated into the phenolic resin. The proportion of lignin in the resin can be varied from 10% up to 40%. This poses a quite prospective idea since using lignin means using nature’s own synthesis instead of artificial petrochemical processes for resin production and thus reducing the energy needed for resin production

scholarly journals Derivation of temperature dependent mechanical properties of polymer foam core materials using optical extensometry

2010 ◽  
Vol 6 ◽  
pp. 38004 ◽  
Author(s):  
J.M. Dulieu-Barton ◽  
C. Boyenval Langlois ◽  
O.T. Thomsen ◽  
S. Zhang ◽  
R.K. Fruehmann
Keyword(s):  
Mechanical Properties ◽  
Foam Core ◽  
Polymer Foam ◽  
Temperature Dependent ◽  
Core Materials
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