关键词: 流变性, 型砂, 粘土膜, 蛋壳, 蛋形函数, 仿生设计, 关键词：耐压壳

Abstract: Rheological behaviour of bentonite film between grains of molding sand were tested with a self-designed apparatus. Test results show that rheological character of the bentonite film can be expressed as Bingham-Kelvin model or B-K model. Furthers thixotropy and stress-relaxation were observed during deformation of bentonite filmand the degree of their effect on the compaction of molding sand were estimated.

Key words: Bentonite film, character, Molding sand, Rheological, Bionic design, Egg shape function, Eggshell, Keywords: Pressure hull