Identification of fracture process under moisture variation in wood materials

摘要：

　　The instantaneous fracture of wood material is commonly the source of important accident in the mechanical industries and civil engineering structures.This fact proves that it is necessary to propose a model capable to identify or predict the crack initiation in such materials.In this work,an analytical and numerical model taking into account the stress relaxation coupled with hygrothermal effects and an ageing viscoelastic behavior is proposed.This approach includes shrinkage – swelling effects with orthotropy properties in the radial and transversal directions.This model is applied to a green wood slice during the natural drying process.The viscoelastic properties inducing a partial hydric stress relaxation and a finite element model is proposed based on a orthotropic generalized Kelvin Voigt model taking into account a moisture content dependence on its rheological properties as mechano-sorptive effects.The fracture criterion is introduced according to the Tsai-Wu or Hill approaches rewritten in terms of energy criterion and the numerical model allows to focusing the crack growth initiation localization.Some experimental results are compared with numerical modeling to predict the shrinkage process integrating the crack growth initiation.

关键词： Green wood drying experimental characterization finite element method crack growth initiation

作者: Frédéric Dubois Rostand Moutou Pitti Eric Fournely Destrebecq JF

作者单位: Heterogeneous Material Research Group,Civil Engineering and Durability department,University of Limo Clermont Université,Université Blaise Pascal,Institut Pascal,BP 10448,F-63000 CLERMONT-FERRAND,Franc Clermont Université,Université Blaise Pascal,Institut Pascal,BP 10448,F-63000 CLERMONT-FERRAND,Franc

会议类型: 国际会议

会议名称: 第13届国际断裂大会(ICF2013)

会议地点: 北京

会议语种:英文

页码: 1-10

在线出版日期: 2013-06-16（万方平台首次上网日期，不代表论文的发表时间）