PGD analysis of the heating of a composite laminate during ultrasonic compaction

X CONGRESO NACIONAL DE MATERIALES COMPUESTOS. Celebrado en Algeciras los días 2, 3, 4 y 5 de julio de 2013Compaction of composite layers just after placing them is a key requirement for the new out-of-autoclave in-situ curing techniques. A solution proposed for this task is the use of ultrasonic compactors. In fact, the ultrasonic vibration over the laminate induces a viscous heating of the resin that becomes less viscous and lets the air bubbles escape. The numerical study of this heat generation and distribution within the laminate implies several modeling problems because of its different dimensions (10 cm for the width of the prepreg tape and 0.01 mm for its thickness) and its two scales of time (10 seconds for the process and 1O m icroseconds for the vibration). The Proper Generalized Decomposition (PGD) is a suitable technique to overcome this kind of problems. The formulation and implementation of the PGD for the problem of viscous heating inside composite laminates is presented in this work

Proper Generalized Decomposition based dynamic data-driven control of thermal processes

Proper Generalized Decomposition; Dynamic Data-Driven Application Systems; Control; Real time; Parametric models; Thermal processesPeer ReviewedPostprint (author's final draft

Proper generalized decomposition based dynamic data-driven control of material forming processes

Proper Generalized Decomposition; Dynamic Data-Driven Application Systems; Control; Real time; Parametric models; Thermal processesPeer Reviewe

Flow modelling of quasi-Newtonian fluids in two-scale fibrous fabrics: Advanced simulations

Permeability is the fundamental macroscopic material property needed to quantify the flow in a fibrous medium viewed as a porous medium. Composite processing models require the permeability as input data to predict flow patterns and pressure fields. In a previous work, the expressions of macroscopic permeability were derived in a double-scale porosity medium for both Newtonian and generalized Newtonian (shear-thinning) resins. In the linear case, only a microscopic calculation on a representative volume is required, implying as many microscopic calculations as there are representative microscopic volumes in the whole fibrous structure. In the non-linear case, and even when the porous microstructure can be described by a unique representative volume, a large number of microscopic calculations must be carried out as the microscale resin viscosity depends on the macroscopic velocity, which in turn depends on the permeability that results from a microscopic calculation. An original and efficient offline-online procedure was proposed for the solution of non-linear flow problems related to generalized Newtonian fluids in porous media. In this paper, this procedure is generalized to quasi-Newtonian fluids in order to evaluate the effect of extensional viscosity on the resulting upscaled permeability. This work constitutes a natural step forward in the definition of equivalent saturated permeabilities for linear and non-linear fluids