关键词: 胶凝原油 , 损伤变量 , 应力－应变 , 本构方程

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