Abstract: Combined with the stress-strain propery of the constant shear rate start-up process of the gelled crude oil, a damage variable (or damage factor) has been introduced and the mechanical constitutive model which considers the damage was constructed. The experiments have proved that the new model can primely describe the stress-strain relationship of the initial destroy process during the start-up of the gelled crude oil. Utilized these obtained parameters of the constitutive equations, the damage evolution curve under corresponding conditions has been maked. Analysised with the stress-strain curve, the start-up temperature has the minimum effect to the structural damage was discovered and destroy process of the gelled crude oil , and its damage evolution curves under different conditions were general coincided. While start-up shear rate and the static cooling range have comparatively large effect to the structural damage and destroy process. And along with the value increases, the damage and destroy process will demonstrate acceleration features.

Key words: Gelled crude oil, Damage variable, Stress and strain, Constitutive equation

摘要： 引入损伤变量（因子），结合胶凝原油恒剪切速率启动过程的应力－应变特性，建立了考虑损伤的力学本构模型，经实验验证，新本构方程可很好地描述胶凝原油启动初始破坏过程的应力－应变关系。利用获得的本构方程参数，作出了相应条件下的损伤演化曲线，与应力－应变曲线结合分析发现，启动温度对胶凝原油结构损伤破坏过程影响最小，其不同条件下的损伤演化曲线基本重合；而启动剪切速率和静态降温幅度对损伤演化过程的影响相对较大，且随其值的增大，损伤演化过程表现出加速特性。

关键词: 胶凝原油 , 损伤变量 , 应力－应变 , 本构方程