scholarly journals The Mechanical Response of a Hybrid Foam Glass-Epoxy Composite Corrugated Cellular Structure Sandwich Panel

2014 ◽  
Author(s):  
Adam Malcom
Keyword(s):  
Cellular Structure ◽  
Sandwich Panel ◽  
Mechanical Response ◽  
Epoxy Composite ◽  
Foam Glass ◽  
Hybrid Foam

A Study on Structure and Phase Composition of Cellular Ceramic Materials from Dispersed Silica-Rich Rocks

2018 ◽  
Vol 284 ◽  
pp. 893-898
Author(s):  
Andrey Yu. Stolboushkin ◽  
A.I. Ivanov ◽  
O.A. Fomina
Keyword(s):  
Phase Composition ◽  
Cellular Structure ◽  
Solid Phase ◽  
Foam Glass ◽  
Physical And Mechanical Properties ◽  
Ceramic Materials ◽  
Average Density ◽  
Crystalline Material ◽  
Pore Glass ◽  
Cellular Ceramic

Studies on structure, phase composition and properties of ceramic wall materials with a glass-crystalline framework from dispersed silica-rich rocks are described. The results of chemical, mineralogical and granulometric compositions of tripolite and granulated foam-glass crystalline material (GFGCM) are presented. The dependence of physical and mechanical properties of cellular ceramic materials on GFGCM content in the composition in the amount from 5 to 75% is determined. Test samples of cellular ceramic materials with dimensions 250 × 120 × 65 mm, having a compressive strength 16.2-20.8 MPa, water absorption 7.1-7.9 % and an average density 0.99-1.32 g/m3 were produced at the factory. At the macroscale level the cellular structure of the ceramic material consists of closed pores with a vitrified inner surface pore, glass-crystalline outer shell of the pores and solid phase of the framework walls. It was established that after firing in the temperature range 850-900 °C the walls of the framework are represented by quartz, feldspar and hematite, a pronounced halo is indicating a significant amount of glass phase.

Mechanical response of metallic honeycomb sandwich panel structures to high-intensity dynamic loading

2008 ◽  
Vol 35 (9) ◽  
pp. 1063-1074 ◽  
Author(s):  
Kumar P. Dharmasena ◽  
Haydn N.G. Wadley ◽  
Zhenyu Xue ◽  
John W. Hutchinson
Keyword(s):  
Dynamic Loading ◽  
High Intensity ◽  
Sandwich Panel ◽  
Mechanical Response ◽  
Honeycomb Sandwich

Effect of Polishing Pad Material Properties on Chemical Mechanical Polishing (Cmp) Processes

1994 ◽  
Vol 337 ◽  
Author(s):  
Rajeev Bajaj ◽  
Mukesh Desai ◽  
Rahul Jairath ◽  
Matthew Stell ◽  
Robert Tolles
Keyword(s):  
Material Properties ◽  
Chemical Mechanical Polishing ◽  
Material Removal ◽  
Cellular Structure ◽  
Mechanical Response ◽  
Removal Rate ◽  
Mechanical Polishing ◽  
Cold Flow ◽  
Polymer Properties ◽  
Polishing Pads

ABSTRACTChemical mechanical polishing (CMP) technology has successfully met the stringent requirements of ultraplanarized surfaces in semiconductor manufacture. Commonly, polyurethane based pads have been used to achieve this level of planarization. Recent studies have shown that the material properties of polishing pads used in the CMP process strongly influence the ability to reduce topography. In addition, past work has shown that in the absence of pad regeneration, polishing rate drops dramatically with polishing time. This decrease in material removal rate is believed to coincide with deterioration of the pad surface due to “cold flow” and/or “caking” of the pad material. This study attempts to correlate the intrinsic polymer properties and cellular structure of the pad material to CMP process indices like polishing rate and planarity. For example, the drop off in removal rate as a function of time can be attributed to the mechanical response of polyurethanes under conditions of critical shear. Moreover, planarity achieved is a function of pad stiffness - which itself is dependant upon intrinsic polymer stiffness and cell density.

Geometrical nonlinear thermal response of sandwich panels with temperature dependent mechanical properties—Extended high-order approach

2019 ◽  
Vol 21 (5) ◽  
pp. 1700-1725 ◽  
Author(s):  
Yeoshua Frostig ◽  
George Kardomateas
Keyword(s):  
Mechanical Properties ◽  
Sandwich Panel ◽  
Mechanical Response ◽  
Numerical Study ◽  
Thermal Response ◽  
High Order ◽  
Theory Approach ◽  
Temperature Dependent ◽  
The Core ◽  
Compressive Loads

The thermal and the thermo-mechanical responses of a sandwich panel with a compliant core are investigated within the framework of the extended high-order approach where the core properties are temperature dependent or independent. Loads schemes include thermal field within temperature working range simultaneous with in-plane compressive loads applied to the core only and to the face sheets and core in the form of the uniform end—shortening of edge of panel. The mathematical formulations use the extended high-order sandwich panel theory approach that takes into account the in-plane rigidity of the core and uses the deformation patterns of the high-order sandwich panel theory. The linear and nonlinear field equations along with the appropriate boundary conditions are presented. A numerical study is conducted, and it investigates the thermal response with temperature independent and temperature dependent mechanical properties of the core as well as the thermo-mechanical response due to in-plane compressive loads. The results include displacements, stress resultants, and stress at critical locations along the panel as well as equilibria curves. They reveal that, in general, the panel with temperature independent properties response remains almost linear while with temperature dependent ones it takes a general nonlinear response. The addition of an external mechanical load changes the response from a linear/nonlinear one that may be allowable stress controlled to a case where loss of stability occurs.

The Effect of Chemical Composition, Density and Cellular Structure on the Dynamic Mechanical Response of Polyolefin Foams

2002 ◽  
Vol 21 (2) ◽  
pp. 117-136 ◽  
Author(s):  
M.A. Rodríguez-Pérez
Keyword(s):  
Chemical Composition ◽  
Dynamic Mechanical Analysis ◽  
Cellular Structure ◽  
Mechanical Response ◽  
Mechanical Analysis ◽  
Chemical Compositions ◽  
Polymer Morphology ◽  
Dynamic Mechanical ◽  
The Way

Dynamic mechanical analysis has been applied to a collection of polyolefin foams with different chemical compositions and densities and manufactured from different routes. The effect of different foam characteristics, such as density, polymer morphology and cellular structure on the dynamic mechanical response is analysed. The way in which this technique can be used to obtain information about the polymer morphology of the foam is presented. In addition, examples of the use of this technique in studying specific problems are illustrated.

Finite Element Study on the Influence of Shear Key Diameter on the Shear Performance of Composite Sandwich Panel with PU Foam Core

2013 ◽  
Vol 376 ◽  
pp. 103-107
Author(s):  
A. Mostafa ◽  
K. Shankar
Keyword(s):  
Finite Element ◽  
Failure Mode ◽  
Sandwich Panel ◽  
Mechanical Response ◽  
Shear Loading ◽  
Foam Core ◽  
Element Analysis ◽  
Composite Sandwich ◽  
The Core ◽  
Pu Foam

The present study deals with the shear behavior of the composite sandwich panels comprised of Polyvinylchloride (PVC) and Polyurethane (PU) foam core sandwiched between Glass Fiber Reinforced Polymer (GFRP) skins using epoxy resin. Experiments have been carried out to characterize the mechanical response of the constituent materials under tension, compression and shear loading. In-plane shear tests for the sandwich panel reveal that the main failure mode is the delamination between the skin and the core rather than shearing the core itself since the skin-core interaction is the weakest link in such structure. The Finite Element Analysis (FEA) of the sandwich structure, based on the non-linear behavior of the foam core and skin-core cohesive interaction, shows that shear response and failure mode can be predicted with high accuracy.

Scattering by a semi-infinite sandwich panel perforated on one side

1990 ◽  
Vol 431 (1883) ◽  
pp. 465-479 ◽  
Keyword(s):  
Approximate Solution ◽  
Cellular Structure ◽  
Sandwich Panel ◽  
Asymptotic Limit ◽  
Sound Waves ◽  
Elastic Plates ◽  
Major Difficulty ◽  
Hopf Equation ◽  
Hopf Method ◽  
Thin Elastic Plates

The scattering of sound waves by the edge of a sandwich panel which consists of two thin elastic plates containing a light interior cellular structure is analysed. The Wiener-Hopf method is used to examine the interaction effects of a semi-infinite panel clamped to a semi-infinite rigid screen. One major difficulty is that the presence of two different velocity potentials on either side of the plane y = 0, results in a matrix Wiener–Hopf equation. An approximate solution is given in the asymptotic limit of small values of a parameter ז , which accounts for the perforations.

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