caa a22 4500 463216660 CHVBK 20180405153158.0 cr unu---uuuuu 170326e20071001xx s 000 0 eng 10.1007/s00226-007-0133-x doi (NATIONALLICENCE)springer-10.1007/s00226-007-0133-x Micromechanical approach to wood fracture by three-dimensional mixed lattice-continuum model at fiber level [Elektronische Daten] [Marjan Sedighi-Gilani, Parviz Navi] To investigate the fracture behavior of wood, the porosity and heterogeneities of its microstructure should be taken into account. Considering these features of wood microstructure in a continuum-based model is still a difficult problem and the lattice model might be an alternative. In the developed mixed lattice-continuum model, the probable crack propagation volume was modeled by defining a three-dimensional lattice of different beam elements and the other regions were considered as continuum medium. Different beam elements of lattice represented the earlywood fibers, latewood fibers, ray cells and bonding medium between the fibers. The proposed model was used to investigate the mechanism of mode I fracture in a small notched wood specimen in RL orientation. The resulting pre-peak and softening curve and also the crack opening trajectory in both cross-section and longitudinal-section in model were in good agreement with the experimental observations. This model shows the importance of considering the three-dimensional and distributed propagation of microcracks and main cracks in fracture stability. It was also shown that in mode I fracture, RL orientation, the main crack propagates in the earlywood ring. Springer-Verlag, 2007 Sedighi-Gilani Marjan Institute of Materials Science, Ecole Polytechnique Fédérale de Lausanne, 1015, Lausanne, Switzerland aut Navi Parviz Institute of Materials Science, Ecole Polytechnique Fédérale de Lausanne, 1015, Lausanne, Switzerland aut Wood Science and Technology Springer-Verlag 41/7(2007-10-01), 619-634 0043-7719 41:7<619 2007 41 226 https://doi.org/10.1007/s00226-007-0133-x text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00226-007-0133-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Sedighi-Gilani Marjan Institute of Materials Science, Ecole Polytechnique Fédérale de Lausanne, 1015, Lausanne, Switzerland aut NATIONALLICENCE 700 1- Navi Parviz Institute of Materials Science, Ecole Polytechnique Fédérale de Lausanne, 1015, Lausanne, Switzerland aut NATIONALLICENCE 773 0- Wood Science and Technology Springer-Verlag 41/7(2007-10-01), 619-634 0043-7719 41:7<619 2007 41 226 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer