74 research outputs found
Elastic constants of fibre-textured thin films determined by X-ray diffraction
Supposing the Hill grain-interaction model, it is demonstrated that X-ray elastic constants can be used to determine mechanical elastic constants of cubic fibre-textured thin films. The new approach is demonstrated by the experimental characterization of out-of-plane moduli of fibre-textured Cu and CrN thin films
A finite strain fibre-reinforced viscoelasto-viscoplastic model of plant cell wall growth
A finite strain fibre-reinforced viscoelasto-viscoplastic model implemented in a finite element (FE) analysis is presented to study the expansive growth of plant cell walls. Three components of the deformation of growing cell wall, i.e. elasticity, viscoelasticity and viscoplasticity-like growth, are modelled within a consistent framework aiming to present an integrative growth model. The two aspects of growth—turgor-driven creep and new material deposition—and the interplay between them are considered by presenting a yield function, flow rule and hardening law. A fibre-reinforcement formulation is used to account for the role of cellulose microfibrils in the anisotropic growth. Mechanisms in in vivo growth are taken into account to represent the corresponding biologycontrolled behaviour of a cell wall. A viscoelastic formulation is proposed to capture the viscoelastic response in the cell wall. The proposed constitutive model provides a unique framework for modelling both the in vivo growth of cell wall dominated by viscoplasticity-like behaviour and in vitro deformation dominated by elastic or viscoelastic responses. A numerical scheme is devised, and FE case studies are reported and compared with experimental data
Dry, hydrophobic microfibrillated cellulose powder obtained in a simple procedure using alkyl ketene dimer
The implication of chemical extraction treatments on the cell wall nanostructure of softwood
Combined elastic strain and macroscopic stress characterization in polycrystalline Cu thin films
A comparison of two techniques for wood fibre isolation - evaluation by tensile tests on single fibres with different microfibril angle
Properties of chemically and mechanically isolated fibres of spruce (Picea abies [L.] Karst.). Part 2: Twisting phenomena
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