Woven thermoplastic composite forming simulation with solid-shell element method

Textile composites become more and more popular in aeronautic industries, due to their high performances. In this work, based on the model shown in the paper [9], a solid-shell element is used to simulate the woven composite forming. Comparing with other shell elements, a distinctive advantage of solid-shell elements is that the complication on handing finite rotations does not exist. Accounting the specific mechanical behaviors of woven composite material, the tensile, in-plane shear, bending and compressive energies are taken into account depending on the fiber direction, and then the total strain energy is computed to be the sum of those energies. The necessary material data for the simulation come from standard tensile, compressive and bias test experiments. Some forming simulations are performed with this method, and we can observe the wrinkles that exhibit the influence of bending stiffness. The results show the efficiency of the approach.

A Case Report of Sandhoff Disease

Sandhoff disease is a rare and severe lysosomal storage disorder representing 7% of GM2 gangliosidoses. Bilateral thalamic involvement has been suggested as a diagnostic marker of Sandhoff disease. A case of an 18-month-old infant admitted for psychomotor regression and drug resistant myoclonic epilepsy is presented. Cerebral CT scan showed bilateral and symmetrical thalamic hyperdensity. MRI revealed that the thalamus was hyperintense on T1-weighted images and hypointense on T2-weighted images with a hypersignal T2 of the white matter. Enzymatic assays objectified a deficiency of both hexosaminidases A and B confirming the diagnosis of Sandhoff disease

Simple Models of CRTM Process

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Dependence of the Reinforcement Anisotropy on a Three Dimensional Resin Flow Observed by X-Ray Radioscopy

International audienc

Interaction of a flame front with its self-generated flow in an enclosure: The “tulip flame” phenomenon

International audienc

Dependence of the Reinforcement Anisotropy on a Three Dimensional Resin Flow Observed by X-Ray Radioscopy

We described an experimental technique, which can be used to measure simultaneously the three principal permeabilities of fiber reinforcement made of short or long fibers. This original technique utilizes the X-Ray radioscopy for detecting the position of the liquid front inside of the preform. An analysis of the different experimental results allowed us to measure, explain and justify the influence of the various parameters related to the flow conditions, the mold geometry and the reinforcement material structure. The experimental study proves that this technique is not limited by high anisotropy factors. We obtain good agreement between results of this visualization technique and numerical simulation of the resin flow. </jats:p

Mesure de la perméabilité spatiale d'un renfort tridimensionnel pour matériaux composites à matrice polymère

International audienc

Interaction of a flame front with its self-generated flow in an enclosure: The “tulip flame” phenomenon

International audienc

Unified saturation and micro-macro voids method in Liquid Composite Molding

International audienc