1 / 8

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.

pmarlin
Télécharger la présentation

Competencies of PTS – all under one roof

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related