P_2.2.3 sfem_mat

The Material Model of TIMBER – Mechanic-stochastic 3D Material Description Using SFEM

Materials that are used for support application and connected safety and economical requirements call for a comprehensive know-how regarding their mechanical effects. Additionally, the integration of stochastics as a crucial aspect for safety considerations is indispensable, especially for materials with widely diverging specific parameters. Timber is a broadly applicable, naturally grown light-weight material showing significantly diverging specific parameters.This is especially why timber requires an overall description as to its mechanical properties, variability and stochastics.

It is the aim of this project to imbed stochastics in the material, non-linear finite elements method in order to make it into a stochastic FEM (SFEM). The projects 2.2.1 MMSM and 2.2.2 MMSM together with the models elaborated and studies carried out in the course of these serve as building stones for the overall jigsaw, and find further application in studying the structures. In this way, analyses of rod-like and plane-like building components are envisaged, accounting for a variation of initial parameters and checking the existing normative specific parameters, and extended detailed studies that are based on the projects carried out beforehand. In this way, the calculation of deformations and in particular of supporting capacities can be carried out by using virtually generated structures (such as glulam, cross laminated timber, or structural timber), virtual elements and components (such as boards, or board segments) when specifically varying the initial parameters (E module, component firmness bulk density, failure characteristic categorisations, system definitions, etc.). This enables, for the first time, the relative assessment of structures primarily based on simulations, enabling comparative statements on the supporting capacity of these structures. This, in its turn, allows for comprehensive transfer performance possibilities, such as optimised product developments as, for instance, glulam or cross laminated timber and an optimum cut and analysis of occurring instances of damage which are further described under sub-area 2.2 MMSM.