Nonlinear analysis of wood based on three-dimensional combined elastic-plastic and damage model
Wang Mingqian1,2 Song Xiaobin1,2 Gu Xianglin1,2
1. College of Civil Engineering, Tongji University, Shanghai 200092, China;
2. Key Laboratory of Performance Evolution and Control for Engineering Structures of the Ministry of Education, Tongji University, Shanghai 200092, China
Abstract：In order to predict the complex mechanical behavior of wood, a three dimensional constitutive model was established within the framework of elastic-plastic theory and continuum damage mechanics. Hill yielding criterion and Voce hardening model were selected to describe the hardening behavior of wood under compression. The modified Hashin criterion and exponential damage evolution model were adopted to describe the damage evolution of wood under tension and/or shear. A strain increment based algorithm was developed for the numerical solution of the constitutive model, and the Newton-Raphson iterative method was used to calculate the plastic strain. The constitutive model was implemented into the commercial finite element software ABAQUS via a user-defined subroutine (UMAT), and was validated with test results. The simulation results of wood under longitudinal and radial compression indicated that the constitutive model can effectively describe the hardening behavior of wood under compression. It was also found that the failure criterion can accurately capture the failure modes of wood subjected to combined tension stress perpendicular-to-wood-grain direction and longitudinal stress, and the damage evolution model can reasonably track the damage evolution of wood.
王明谦 宋晓滨 顾祥林. 基于三维弹塑性损伤模型的木材非线性分析[J]. 土木工程学报, 2018, 51(7): 22-28.
Wang Mingqian Song Xiaobin Gu Xianglin. Nonlinear analysis of wood based on three-dimensional combined elastic-plastic and damage model. 土木工程学报, 2018, 51(7): 22-28.
