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《Chinese Journal of Computational Mechanics》 2011-04
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Numerical simulation of mechanical behaviour of wood under complex stress

CHEN Zhi-yong,ZHU En-chun,PAN Jing-long(School of Civil Engineering,Harbin Institute of Technology,Harbin 150090,China)  
A constitutive model of wood suitable for FE modeling of the structures was developed.In the model,wood is orthotropically elastic with different strengths in compression and tension;wood exhibits brittle failure under tension or shear,but yields under compression.The orthotropic symmetry theory was employed to express the relationship between elastic stress and strain.Yamada-Sun criterion was used to judge yield of wood in compression and strain-softening of wood in tension and shear.The strain-softening model of wood was established by introducing the damage factor and the elastic strain energy.The flow rule was derived by yield function according to plastic consistency condition.The strain hardening and the secondary strain hardening of compression perpendicular to grain were modeled by controlling the transition of yield surface from initial yield surface to ultimate yield surface.A user-defined subroutine VUMAT was encoded to include the material constitutive model of wood into ABAQUS,and two FE models were developed to simulate the behaviour of wood in compression and tension,including tension and compression at angle to grain.The constitutive relationship and the FE model were validated by comparison of the numerical results with experimental results and Hankinson strength theory of wood.
【Fund】: 国家自然科学基金(50878067)资助项目
【CateGory Index】: O344.1
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