A micromechanics model for 3D elasticity and failure of woven-fibre composite materials

International audienc

The effect of ageing on the damage events in woven-fibre composite materials under different loading conditions

International audienc

Prediction of the elastic behaviour of hybrid and non-hybrid woven composites

International audienc

A micromechanics model for 3D elasticity and failure of woven-fibre composite materials

International audienceAn analytical model called MESOTEX (MEchanical Simulation Of TEXtile) is proposed in this paper with the objective of predicting 3D elastic and failure properties of several woven fibre composite materials. Based on the use of the classical thin laminate theory to the woven structure, the mesotex model is used to analyze plain-weave, satin-weave and twill-weave composites and their hybrid equivalents. Stiffness properties are computed and compared with test data and with the results of other micromechanical models. This correlation is followed by a parametric study in which the effect of strand waviness on the elastic properties is discussed for different woven-fibre composites. Moreover, this analytical model is extended in order to predict failure strength under tensile load in woven-fibre composite materials with a point-wise stiffness reduction technique

DNA Detection Using Origami Paper Analytical Devices

We demonstrate the hybridization-induced fluorescence detection of DNA on an origami-based paper analytical device (oPAD). The paper substrate was patterned by wax printing and controlled heating to construct hydrophilic channels and hydrophobic barriers in a three-dimensional fashion. A competitive assay was developed where the analyte, a single-stranded DNA (ssDNA), and a quencher-labeled ssDNA competed for hybridization with a fluorophore-labeled ssDNA probe. Upon hybridization of the analyte with the fluorophore-labeled ssDNA, a linear response of fluorescence vs. analyte concentration was observed with an extrapolated limit of detection < 5 nM and a sensitivity relative standard deviation as low as 3%. The oPAD setup was also tested against OR/AND logic gates, proving to be successful in both detection systems