关键词: 超弹性, 封隔器, 高温, 试验技术, 橡胶, 应力—应变关系

Abstract: The key component of a packer is the hyperelastic rubber sleeve. When the packer rubber is settled, its mechanical properties will determine the sealing ability of the packer. In this paper an experimental study on packer rubber material is conducted. A kind of non-contact optical deformation record technique, which is named automatic grid method, is utilized to measure rubber sample deformation under tension loading. Also the experimental setup involves temperature control system. Two kinds of compound material are tested at different temperature environment from room temperature to 338 K, and the stress-strain curves with high precision are obtained. The experiment results demonstrate that with the rise of temperature the stiffness and the ratios of strain energy density of the two rubbers exhibit decreasing first and increasing later with 338 K transition temperature. However, the hysteresis losses of the two rubbers descend linearly with temperature rising. The Poisson ratios of the two rubbers are about 0.5 which means they are nearly incompressible materials. The conclusions provide experimental basis for establishing constitutive relations of packer rubbers.

Key words: Experimental technology, High temperature, Hyperelasticity, Packer, Rubber, Stress-strain relation