Analysis of Hardening Effects of Open-Celled Model Foams by Numerical Homogenization

2009 ◽  
Author(s):  
S. Demiray ◽  
W. Becker ◽  
J. Hohe
Keyword(s):  
Numerical Homogenization

scholarly journals Numerical Homogenization of Multi-Layered Corrugated Cardboard with Creasing or Perforation

Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 3786
Author(s):  
Tomasz Garbowski ◽  
Anna Knitter-Piątkowska ◽  
Damian Mrówczyński
Keyword(s):  
Computational Models ◽  
Load Capacity ◽  
Torsional Stiffness ◽  
Numerical Homogenization ◽  
Corrugated Board ◽  
3D Geometry ◽  
Corrugated Cardboard ◽  
Numerical Tools ◽  
Packaging Industry ◽  
Theoretical Considerations

The corrugated board packaging industry is increasingly using advanced numerical tools to design and estimate the load capacity of its products. This is why numerical analyses are becoming a common standard in this branch of manufacturing. Such trends cause either the use of advanced computational models that take into account the full 3D geometry of the flat and wavy layers of corrugated board, or the use of homogenization techniques to simplify the numerical model. The article presents theoretical considerations that extend the numerical homogenization technique already presented in our previous work. The proposed here homogenization procedure also takes into account the creasing and/or perforation of corrugated board (i.e., processes that undoubtedly weaken the stiffness and strength of the corrugated board locally). However, it is not always easy to estimate how exactly these processes affect the bending or torsional stiffness. What is known for sure is that the degradation of stiffness depends, among other things, on the type of cut, its shape, the depth of creasing as well as their position or direction in relation to the corrugation direction. The method proposed here can be successfully applied to model smeared degradation in a finite element or to define degraded interface stiffnesses on a crease line or a perforation line.

scholarly journals Estimating effective conductivity of unidirectional transversely isotropic composites

2013 ◽  
Vol 35 (3) ◽  
Author(s):  
Nguyen Trung Kien ◽  
Nguyen Van Luat ◽  
Pham Duc Chinh
Keyword(s):  
Effective Conductivity ◽  
Fourier Method ◽  
Transversely Isotropic ◽  
Transverse Plane ◽  
Numerical Homogenization ◽  
Unidirectional Composites ◽  
Periodic Composites ◽  
Point Correlation ◽  
Correlation Parameters

Three-point correlation bounds are constructed on effective conductivity of unidirectional composites, which are isotropic in the transverse plane. The bounds contain, in addition to the properties and volume proportions of the component materials, three-point correlation parameters describing the micro-geometry of a composite, and are tighter those obtained in [1]. The bounds, applied to some disordered and periodic composites, keep inside the numerical homogenization results obtained by Fast Fourier method.

scholarly journals Contact modelling of highly heterogeneous friction material for braking applications

2020 ◽  
Vol 21 (5) ◽  
pp. 507
Author(s):  
Essosnam Arfa ◽  
Vincent Magnier ◽  
Philippe Dufrénoy ◽  
Géry de Saxcé
Keyword(s):  
Computing Time ◽  
Heterogeneous Material ◽  
Friction Material ◽  
Significant Advance ◽  
Numerical Homogenization ◽  
Multi Scale ◽  
Scale Method ◽  
Contact Rigidity ◽  
Fem Method ◽  
Contact Modelling

Friction brakes are increasingly undergoing considerable development to improve their durability, efficiency, maintenance costs and environmental impact. Nevertheless, to achieve this, it is necessary to understand the different mechanisms involved in contact that are multi-scale and multi-physical in nature. On the multi-scale aspect, it is well known experimentally that heterogeneities have a pre-weighted role on performance without being able to explain it. Thus, modelling seems to be a good way to better understand the influence of these heterogeneities, provided that we have a multi-scale method to consider them. The objective of this article is therefore to propose a methodology for simulating contact in the presence of heterogeneous materials. The strategy consists in enriching the contact rigidity in terms of behaviour by a method of numerical homogenization. The significant advance of this article lies in the consideration of contact within the technique of numerical homogenization of a heterogeneous material. The strategy is then validated by comparing the mechanical fields between the proposed method and an explicitly meshed case. One of the main contributions of this work is the reduction in computing time compared to the traditional FEM method.

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