中国石油大学学报（自然科学版）2016，Vol.40Issue(2)：135-139,5.DOI:10.3969/j.issn.1673-5005.2016.02.017
一胶凝原油初始应力递增过程的力学模型
Mechanical model of shear stress increasing process during initial deformation of gelled crude oil
摘要
Abstract
Considering the creep and relaxation properties of gelled crude oil, a mechanical model was established by combi-ning the Maxwell viscoelastic analog and a power-law dashpot in parallel. Constitutive equation of the mechanical model was figured out by introducing strain-dependent damage factor into the power-law dashpot and integrity factor into the Maxwell an-alog. Mechanical responses of Daqing and Nanyang crude oils were tested using rheometer under constant shear rates. The constitutive equation was used to fit the experimental data of shear stress increasing process. Stress relaxation processes under constant shear strain were calculated using the fitted model parameters. It has been found that the constitutive equation fits the data very well, and the parameters in the equation keep unchanged under different shear rates, which could be regarded to represent the actual properties of gelled crude oil. The proposed model can describe the relaxation properties of gelled crude oil theoretically. The relaxation modules decrease and the structure damage becomes greater with the increase of shear strain, which is consistent with the actual rheological properties of gelled crude oils.关键词
胶凝原油/初始应变/应力递增/损伤因子Key words
gelled crude oil/initial deformation/increasing shear stress/damage factor分类
能源科技引用本文复制引用
陈雷,刘刚,兰浩,张国忠..一胶凝原油初始应力递增过程的力学模型[J].中国石油大学学报（自然科学版）,2016,40(2):135-139,5.基金项目
国家自然科学基金项目(51574274) （51574274）
中央高校基本科研业务费专项(14CX02107A) （14CX02107A）
中国石油科技创新基金项目(2014D-5006-0604) （2014D-5006-0604）
