Fracture Behavior in Timber Element Under Climatic Variations
Timber elements placed in outdoor conditions are solicited by mechanical loadings and climatic variations.Joints or notched beams are subjected to stress concentrations which can cause a crack growth process due to drying phases.This paper deals with the experimental and analytical approaches about the fracture process in timber element subjected to different moisture content conditions.Two lots of SEN specimens are conditioned in different air conditions and tested in opening mode.A quasi-brittle fracture behavior is studied using a thermodynamic approach taking into account the dissipation based on the crack surface separation and the development of a process zone around the crack tip.The model includes the fracture and damage energy release rate concepts.Based on fracture and damage approaches,the dissipation separation is realized using the coupling of a finite element approach and image analysis tracking the visible crack tip during the experimental test.Experimental results and numerical treatments allow highlighting the moisture content effect on damage and crack growth with an increase of the ductility for high moisture content levels caused by the increase of the process zone size.This work allows envisaging the comprehension of the crack growth process under climatic variations introducing mechano-sorptive aspects.
Fracture mechanic Viscoelastic behavior Mechano-sorptive effects
Frédéric Lamy Frédéric Dubois Octavian Pop Mokhfi Takarli Nicolas Angellier Nicolas Larcher
Heterogeneous Material Research Group,Civil Engineering and Durability department,University of Limoges,Egletons,19300,France
国际会议
北京
英文
1-10
2013-06-16（万方平台首次上网日期，不代表论文的发表时间）