The Slow Strain Rate Stress Corrosion Cracking Test  (SSRT) / stress corrosion (SCC)

Stress corrosion cracking (SCC) continues to be a significant concern for many major industries, so test methods for predicting and measuring it are important.

The slow strain rate test (SSRT) was created in the 1960’s and involves a slow (compared to conventional tensile tests) dynamic strain applied at a constant extension rate in the environment of interest. 

Typical initial strain rates are 1 × 10−7 s−1 to 1 × 10−5 s−1, but lower and higher rates may be used, depending upon the alloy-environment system, the experimental variables, and the test objectives. SSRTs are generally run until total failure, which may take hours or days but could occasionally be shorter, longer, or interrupted.After failure, the specimens are examined for SCC, and measurements taken during and after the test are compared to similar data for an inert environment. There are several options available and important decisions to be made when using the SSRT. These are discussed and comparisons made to SCC tests using constant load (CL), constant strain (CS), and fracture mechanics (FM) techniques. In this review, FM refers to stress corrosion tests using fatigue precracked specimens and an intent to achieve plane strain conditions—with either static or dynamic, loading or displacement.

Beijing United Test Co.,Ltd. export@unitedtest.com offer the testing machine of Slow Strain Rate Stress Corrosion Cracking Test  (SSRT) / stress corrosion (SCC). Contact us now : export@unitedtest.com, unitedtest@hotmail.com