Abstract：Based on a simple constitutive model originally proposed for characterizing the nonlinear behavior of fiber composites, a two-parameter elasto-plastic constitutive model was developed in this study by taking into account the characteristics of wood material. In the model, the plastic strain in the longitudinal direction of wood is considered and wood is idealized be to transversely isotropic| a quadratic polynomial yield function is employed and it is assumed that the initial yielding may occur once the load is applied. Effective stress and effective plastic strain are introduced in the model to characterize the intrinsic nonlinear feature of wood under compressive load. In order to determine the unknown parameters in the model as well as to evaluate its suitability for modelling wood, compression test using Korean pine specimens in different fiber orientations was conducted. The comparison results of stress-strain curves for different orientations of wood specimens obtained from test and model prediction show that, the two-parameter model can simulate the nonlinear behavior of wood reasonably well and can thus be applied to predicting the mechanical behavior of wood under off-axial load.
杨娜 张雷 秦术杰. 一种描述木材受压的非线性本构模型及试验验证[J]. 土木工程学报, 2017, 50(4): 80-88.
Yang Na Zhang Lei Qin Shujie. A nonlinear constitutive model for characterizing wood under compressive load and its test verification. 土木工程学报, 2017, 50(4): 80-88.
