Thermo-hyrgo-mechanical processes for the densification and forming of wood: Continuum-mechanical material formulation and structural simulations

用于木材致密化和成型的热湿机械工艺：连续机械材料配方和结构模拟

基本信息

批准号：
233962626
负责人：
Professor Dr.-Ing. Michael Kaliske
金额：
--
依托单位：
Institut für Statik und Dynamik der Tragwerke
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2013
资助国家：
德国
起止时间：
2012-12-31 至 2020-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/233962626?language=en
关键词：
Thermo hyrgo mechanical processes densification

项目摘要

Wood has been used as solid wood for the construction of building structures since centuries. Recently, increased ecological as well as technical requirements lead to a demand for improved properties of building materials. The Institut of Steel and Timber Construction of TU Dresden (ISH) develops the technology of wood forming based on the thermo-hygro-mechanical properties of the raw material wood.The numerical simulation of the wood forming process and the behavior of structural components made from formed wood using the finite element method require a realistic constitutive model in order to describe the thermo-hygro-mechanical material behavior of wood at finite deformations.Main aim of the renewal proposal at hand is the preparation of numerical tools and methods for the simulation and design of optimal industrial products made from formed wood. The numerical simulation provides the means to achieve a deep insight into the multi-physical effects and phenomena within the structures during application of the forming technology.The basis for modelling wood densification as well as wood forming is achieved during the first funding period. In order to further develop and to validate the thermo-hygroscopic anisotropic material modelling of wood at large deformations, a comparison of simulation results with experimental data provided by ISH is carried out.Further developments are made by modelling the current density of wood under consideration of its raw material and its bound water. To this purpose, a modification of the mass balance mass of moisture and of displacement dependent continuum mechanical processes are carried out with respect to the simulation of the manufacturing of formed wood.Furthermore, a thermo-hygroscopic finite surface element is formulated as well as related constitutive laws, in order to model the moisture in- and out flow and thermal convective phenomena.Additionally, parameter studies are carried out with respect to the identification of significantly influencing values, since only few qualitative and empirical preliminary work regarding this technology is existing.Finally, realistic and industry-related numerical simulations of structural components made from formed wood are carried out and analyzed, in order to demonstrate the practical applicability of the forming technology and its numerical modelling.

几个世纪以来，木材一直用作建筑结构的实木。最近，增强的生态需求和技术需求会导致人们对建筑材料特性的改善需求。 Tu Dresden（ISH）的钢和木材建设机构基于原材料木材的热杂种力学特性开发了形成的木材技术。木材形成过程的数值模拟以及使用有限元的木材制成的结构组件的数字模拟，需要有限元的木材，以描述有限元模型，以描述造型的木材，以描述固定的木材，以描述固定的木材，填充了填充材料的填充材料，填充了热型式行为，以填充热 - 型式行为构造，以填充热量 - 固定型材料。手头的更新建议是准备数值工具和方法，以模拟和设计由形成木材制成的最佳工业产品。数值模拟提供了对形成技术应用过程中结构内的多物理效应和现象的深入了解的手段。在第一个融资期间实现了建模木材致密化以及木材形成的基础。为了进一步发展并验证木材在较大变形时木材的热型各向异性材料建模，将仿真结果与ISH提供的实验数据进行比较。通过对其原料及其边界的木材的当前木材密度进行建模，进行了模型。为此，对形成的木材制造的模拟进行了修改水分的质量平衡质量和依赖性连续性机械过程的修改。Furthermore的模拟。为了对水分和外界进行鉴定，对湿度和相关的构型进行了构图，以实现了热量 - 高光谱有限的表面元素以及相关的组成型法律。具有显着影响的价值，由于有关该技术的少数定性和经验初步工作是存在的。对由形成木材制成的结构成分进行了实际，现实且与行业相关的数值模拟，并进行了分析，以证明形成技术及其数字模型的实际适用性。