A Network Model Applied to Cellulose Fibre Materials

Sammanfattning: A network mechanics model for analysis of materials made of dry-shaped cellulose fibres is proposed. In terms of the model, the network is composed of fibres of arbitrary distribution in length, curvature, cross-section. stiffness and strength. The fibres are arranged in a random structure according to an arbitrary orientation distribution. Where fibres meet there may be fibre-to-fibre interaction, modelled by a linear or non-linear spring coupling representing stick-slip performance. The connection is of arbitrary distribution in stiffness and strength.The network geometry is periodic, any cell under observation being regarded as one of many identical cells that make up a global structure. A set of cyclic boundary and loading conditions facilities obtaining relevant results even in the case of small network cells.A two-dimensional implementation of the model was carried out, and several examples of simulation results are provided. The results concern geometrical properties of the network, and the effects on network stiffness and fracture behavior due to variations of sample size, boundary conditions and the various micro-level parameters mentioned above.