Ansys中Duncan-Chang本构模型的二次开发

Development and Implementation of Duncan-Chang Constitutive Model in ANSYS

Ansys作为国际大型通用有限元软件,自带了许多本构模型,却并没有收入Duncan-Chang本构模型.为了弥补这一缺陷,拓宽其在岩土工程中的应用,以Ansys自带的UPFs二次开发平台成功开展了Duncan-Chang本构模型的二次开发工作,给出了基本步骤和编程要点,并在三轴压缩试验中采用100～400 kPa 4种不同围压,对模型的应力-应变关系及不同应力路径下的结果进行了准确性验证.结果均在误差范围内,表明本程序可为复杂的岩土工程数值分析提供参考.

ANSYS, as international large-scale general finite element software, is equipped with many constitutive models, but it does not have Duncan-Chang constitutive model. In order to make up this defect to expand its applications in geoengineering, the UPFs secondary development platform contained in ANSYS was used to carry out the redevelopment of Duncan-Chang constitutive model successfully. The basic steps and programming points were given, and four different confining pressures of 100kpa-400kpa were used in the triaxial compression test. After the accuracy of the stress-strain relationship of the model and the results under different stress paths were verified, the results are within the error range. It shows that this program can provide reference for the complex numerical analysis of geotechnical engineering.