scholarly journals Ply fragmentation in unidirectional hybrid composites linked to stochastic fibre behaviour: A dual-scale model

2019 ◽  
Vol 181 ◽  
pp. 107702 ◽  
Author(s):  
Francisco Mesquita ◽  
Yentl Swolfs ◽  
Stepan V. Lomov ◽  
Larissa Gorbatikh
Keyword(s):  
Hybrid Composites ◽  
Scale Model ◽  
Unidirectional Hybrid ◽  
Dual Scale

On the Use of a Dual-Scale Model to Improve Understanding of a Pharmaceutical Freeze-Drying Process

2010 ◽  
Vol 99 (10) ◽  
pp. 4337-4350 ◽  
Author(s):  
Valeria Rasetto ◽  
Daniele L. Marchisio ◽  
Davide Fissore ◽  
ANTONELLO A. Barresi
Keyword(s):  
Freeze Drying ◽  
Scale Model ◽  
Drying Process ◽  
Dual Scale

Application of the V-Notch Shear Test for Unidirectional Hybrid Composites

2002 ◽  
Vol 36 (23) ◽  
pp. 2653-2666 ◽  
Author(s):  
Jianmei He ◽  
Martin Y.M. Chiang ◽  
Donald L. Hunston ◽  
Charles C. Han
Keyword(s):  
Shear Test ◽  
Hybrid Composites ◽  
Unidirectional Hybrid

A Dual-Scale LES Subgrid Model for Turbulent Liquid/Gas Phase Interface Dynamics

2015 ◽  
Author(s):  
Marcus Herrmann
Keyword(s):  
Surface Tension ◽  
Numerical Simulations ◽  
Gas Phase ◽  
Isotropic Turbulence ◽  
Phase Interface ◽  
Spatial Filtering ◽  
Direct Numerical Simulations ◽  
Scale Model ◽  
Interface Dynamics ◽  
Dual Scale

Turbulent liquid/gas phase interface dynamics are at the core of many applications. For example, in atomizing flows, the properties of the resulting liquid spray are determined by the interplay of fluid and surface tension forces. The resulting dynamics typically span 4–6 orders of magnitude in length scales, making direct numerical simulations exceedingly expensive. This motivates the need for modeling approaches based on spatial filtering or ensemble averaging. In this paper, a dual-scale modeling approach is presented to describe turbulent two-phase interface dynamics in a large-eddy-simulation-type spatial filtering context. To close the unclosed terms related to the phase interface arising from filtering the Navier-Stokes equation, a resolved realization of the phase interface dynamics is explicitly filtered. This resolved realization is maintained on a high-resolution over-set mesh using a Refined Local Surface Grid approach [1] employing an un-split, geometric, bounded, and conservative Volume-of-Fluid method [2]. The required model for the resolved realization of the interface advection velocity includes the effects of sub-filter surface tension, dissipation, and turbulent eddies. Results of the dual-scale model are compared to recent direct numerical simulations of an interface in homogeneous isotropic turbulence [3].

Modelling Tow Impregnation of Woven Fabric Reinforcements and Its Application in Liquid Composite Moulding Process Modelling

2008 ◽  
Author(s):  
Y. Wang ◽  
S. M. Grove ◽  
M. Moatamedi
Keyword(s):  
Woven Fabric ◽  
Scale Model ◽  
Flow Front ◽  
Moulding Process ◽  
Mathematical Algorithm ◽  
Model Liquid ◽  
Liquid Composite Moulding ◽  
Sink Term ◽  
Time Required ◽  
Dual Scale

This paper proposes a detail physical model for the micro-scale flow in plain woven reinforcements. The modelling results are formulated into a mathematical algorithm which is then directly incorporated into a continuum dual-scale model as a ‘sink’ term. When used to model liquid composite moulding (LCM) processes, this incorporated dual-scale model demonstrates the fact that the impregnation of fibre tows lags behind the resin front in macro pore spaces. The modelling results are in agreement with the experimental observations. It has been shown that the unsaturated region at the flow front could increase or have a fixed length under different circumstances. These differences are explained due to the variation in tow impregnation speed (or the time required for the tow to become fully impregnated) which is related to the weave infrastructure and the nesting and packing of plies. The modelling results have also demonstrated the drooping of the inlet pressure when the flow processes are carried out under constant injection rates.

A micromechanical approach to the viscoelasticity of unidirectional hybrid composites

Composites ◽  
1991 ◽  
Vol 22 (2) ◽  
pp. 113-119 ◽  
Author(s):  
L.E. Govaert ◽  
E.L.J.C.J. D'Hooghe ◽  
A.A.J.M. Peijs
Keyword(s):  
Hybrid Composites ◽  
Micromechanical Approach ◽  
Unidirectional Hybrid
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