Comparison of ring tension and compression test results for materials with low ductility

In this paper, a low-ductility material (AK12 alloy) being used as an example, the stress-strain state of ring specimens is analyzed by digital image correlation and finite element modeling with the use of the most widespread tests, namely diametral compression and tension on semicircular mandrels. The calculations and experiments show that, regardless of the test type and deformation stage, the achievement of critical local strain (4.0‒4.2% for the material under study) can be taken as the limit state for various types and configurations of tests. The results obtained from different types of testing are compared and analyzed in terms of criteria for permanent diametral strain.