Micromechanical Analysis of Three-Dimensional Open-Cell Foams Using the Matrix Method for Space Frame Structures

2004 ◽  
Author(s):  
A. K. Roy ◽  
K. Li ◽  
X. L. Gao
Keyword(s):  
Matrix Method ◽  
Three Dimensional ◽  
Frame Structures ◽  
Space Frame ◽  
Open Cell ◽  
Micromechanical Analysis ◽  
The Matrix ◽  
Open Cell Foams

scholarly journals Investigation of the Deformation State of a Composite Cable Space Frame Structures with a Photogrammetric Method

2018 ◽  
Vol 7 (3.2) ◽  
pp. 442
Author(s):  
Leonid Storozhenko ◽  
Dmytro Yermolenko ◽  
Grygorii Gasii
Keyword(s):  
Limit State ◽  
Three Dimensional ◽  
Frame Structures ◽  
Steel Cable ◽  
Space Frame ◽  
Long Span ◽  
Study Results ◽  
Deformation State ◽  
Vertical Displacements ◽  
Composite Steel

The article presents experimental study results of the deformation state of composite cable space frame structures, including composite steel-concrete structures. Composite cable space frame structures are three-dimensional roof framing of long-span buildings. The designed constructions are a new type of roof framing structures and consist of typical composite steel-concrete modules connected with steel cable elements. The operation of composite cable space frame structures under load is characterised by geometric nonlinearity. The aim of the research is to study the deformation state and changing the geometric shape of experimental structures under the influence of external load. The technique of studying the deformation state of the composite cable space frame structures is based on the principles of digital photogrammetry. At the limit state the composite cable space frame structures change their regular shape. In this case, the central vertical points get the greatest vertical displacements, and the displacement value decreases closer to the supports. It is defined that the investigated construction has demonstrated combined action of all its components during the test, which indicates its effectiveness. The application of the photogrammetry method made possible to determine the moment of reaching the limit state of the composite cable space frame structures concretely.  

Formation of three-dimensional arrays of magnetic clusters NiO, Co3O4, and NiCo2O4 by the matrix method

2016 ◽  
Vol 58 (6) ◽  
pp. 1216-1221 ◽  
Author(s):  
D. A. Kurdyukov ◽  
A. B. Pevtsov ◽  
A. N. Smirnov ◽  
M. A. Yagovkina ◽  
V. Yu. Grigorev ◽  
...  
Keyword(s):  
Matrix Method ◽  
Three Dimensional ◽  
Magnetic Clusters ◽  
The Matrix

scholarly journals Coating of polydopamine on polyurethane open cell foams to design soft structured supports for molecular catalysts

2019 ◽  
Vol 55 (79) ◽  
pp. 11960-11963 ◽  
Author(s):  
Ahmed Ait Khouya ◽  
Miguel L. Mendez Martinez ◽  
Philippe Bertani ◽  
Thierry Romero ◽  
Damien Favier ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Open Cell ◽  
Covalent Grafting ◽  
Open Cell Foams ◽  
Molecular Catalysts

A covalent grafting strategy of molecular catalysts onto a polydopamine-coated flexible three dimensional macroscopic support is presented.

Nonlinear Modeling of 3D Open-Cell Foams

1999 ◽  
Author(s):  
Yu Wang ◽  
Alberto M. Cuitiño
Keyword(s):  
Strain Energy ◽  
Nonlinear Modeling ◽  
Three Dimensional ◽  
Strain Energy Function ◽  
Nonlinear Material ◽  
Open Cell ◽  
Wide Range ◽  
Open Cell Foams ◽  
Explicit Correlation ◽  
Strain Energy Functions

Abstract In this article, we present a hyperelastic model for light and compliant open cell foams with an explicit correlation between microstructure and macroscopic behavior. The model describes a large number of three dimensional structures with regular and irregular cells. The theory is based on the formulation of strain-energy function accounting for stretching which is the main deformation mechanism in this type of materials. Within the same framework, however, bending, shear and twisting energies can also be incorporated. The formulation incorporates nonlinear kinematics which traces the evolution of the structure during loading process and its effects on the constitutive behavior, including the cases where configurational transformations are present leading to non-convex strain-energy functions. Also nonlinear material effects at local or beam level are introduced to accommodate a wide range of different material behaviors. Since the micromechanical formulation presented here has explicit correlation with the foam structure, it preserves in the constitutive relation the symmetries or directional properties of the corresponding structures, including the cases of re-entrant foams which exhibit negative Poisson’s ratio effects. The model captures the central features exhibit by these materials. Predictions of the model for macroscopic uniaxial strain are presented in this article.

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