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Competencies of PTS – all under one roof

PTS research activities related to COST FP 1005 Simulation of micro structure mechanics in dynamic fibre networks Timo Kuntzsch, Jan Matheas, Sven Altmann. Competencies of PTS – all under one roof. Scientific methods Design & Simulation Sensorics Analytics.

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Competencies of PTS – all under one roof

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  1. PTS research activities related to COST FP 1005Simulation of micro structure mechanics in dynamic fibre networksTimo Kuntzsch, Jan Matheas, Sven Altmann

  2. Competencies of PTS – all under one roof • Scientific methods • Design & Simulation • Sensorics • Analytics Value chain … –wood – paper – converting –… Scientific methods Environmental relevance and sustainability aspects Efficient use of resources Innovative fibre composites Surface finishing Material testing and expert opinions Education and training  PTS 2011

  3. L d H D d Design & Simulation – Focal Points • Development of methods and tools for numerical simulation of paper properties • Transition from micro- to final product properties • micro structure generation • micro structure mechanics simulation • homogenisation methods • Simulation based optimisation of the paper production process considering material and economical criteria • Linkage of pulp characteristic, process parameters, paper properties and calculation of costs • Maintenance of comprehensive pulp property data base • PTS-ProductOptimizer • PTS-SoftMcNett  PTS 2011

  4. Micro structure simulation – fibre network generation • Making available digital models of single fibres, fibre bonds and fibre networks • Fibre arrangement and accumulation • Size of modelled section (x-y-plane) • Fibre number (~g/m²), morphology, size distribution • Fibre orientation distribution und x-y-arrangement • Fibre shape profiles in Z-direction after sheet forming • Adjustment of sheet thickness and apparent density by pressing process simulation • Subsequent modelling of: • Behaviour under mechanical load • Capillary force driven liquid penetration • Optical properties • Comparison of different model approaches • e.g. shell vs. beam elements fibre network e.g. 2 x 2 x 0,1 mm³  PTS 2011

  5. Micro structure mechanics simulation Finite element model of fibre bond mechanics • Size and shape of bonding areas • Mechanical characteristics of fibre bond and fibre wall materials (deformation, failure) Model of fibre network mechanics • Search algorithm for contact sites • Implementation of fibre bond model • Modelling the behaviour under mechanical load (e.g. tensile testing) • Deduction of a homogenised material model  PTS 2011

  6. Example: numerical simulation of tensile testing a) Numerically created paper fibre network (area 1mm², height 0.09, sheet density 0.6g/cm³) b) Mechanical model of the fibre network; centre fibre line, idealised fibre bonds) c) longitudinal fibre forces (network is stretched by 2% in x-direction; tension; pressure) d) bonding forces of idealised fibre bonds in the stretched network  PTS 2011

  7. Expected benefit from COST FP 1005 • Micro structure simulation in fibre networksrequires insight in dynamic processes during sheet forming  largely determined by pulp suspension fluid dynamics • more realistic and verified micro structure models for improved fibre network mechanics simulation • Improved characterisation of physical processes during sheet forming, pressing, and drying, thus more realistic paper and fibre network properties • Elucidation of interactions between fibre properties (surface structure, flexibility, morphology …) and suspension flow characteristics • Effect of fibre modification on pulp suspension flow characteristics • Impact of fluid dynamics on fibre properties during stock preparation treatment • Influence of pulp suspension flow parameters on resulting fibre network properties  PTS 2011

  8. Expertise to bring in to COST FP 1005 • modelling and simulation of paper properties and processes, micro structure simulation, mechanics of fibre networks • optimal use and modification of fibres for different processes and products, fibre and fibre network characterization (e.g. fibre morphology distribution …) • experimental investigations under conditions very similar to processes in paper mills using the pilot scale paper machine (stock preparation, sheet forming) • linking fundamental research to applied research activities  PTS 2011

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