Impression relaxation test, a new relaxation method to determine the time dependent characteristics of salt rock

摘要

Relaxation impression technique is a novel relaxation test in which a cylindrical flat ended indenter penetrates into a small region of sample and after keeping the displacement at a certain point, the decrease in the stress level will be recorded. Conventional relaxation test is a time consuming and expensive technique when a number of samples are needed to be tested. In contrast, impression relaxation test requires only a small amount of sample which makes this method cheaper. In this study, the impression relaxation test will be carried out on salt rock using an apparatus, which is designed and fabricated for impression relaxation test, and the results will be compared to the results of conventional compression relaxation test.