木材非线性本构模型研究进展

Research Progress on Nonlinear Constitutive Model for Wood

木材本构模型是进行木构件数值分析的重要基础。介绍基于试验的经验模型和基于理论的弹性模型、弹塑性模型、损伤模型(弹性损伤模型、弹塑性损伤模型)、断裂模型和应变率模型,重点阐述现有模型的理论基础、特点及应用实例,分析其优缺点。总结本构模型在应用中待解决的难题,提出未来研究建立适用于动荷载作用下力学性能分析、考虑应变率影响的木材本构模型。

The wood constitutive model is an essential basis for the numerical analysis of timber members.This paper introduces the empirical model based on experiment,elastic model,elastic-plastic model,damage model(elastic damage model,elastic-plastic damage model),fracture model,and strain rate model based on theory.The theoretical basis,characteristics,and application examples of the existing models are emphasized.Furthermore,both advantages and disadvantages of the constitutive model for wood are analyzed.The current issues and problems in the application of the constitutive model are summarized.It is necessary to establish a wood constitutive model considering the effect of the strain rate,which is suitable for the analysis of mechanical properties under dynamic load.