Stress corrosion cracking (SCC) poses a significant challenge in materials science, particularly in industries where structural integrity is paramount. Understanding the susceptibility of materials to SCC is crucial for ensuring the reliability and safety of engineering components. In this text, we delve into the technical aspects of SCC testing, its purpose, and the insights it provides into material behavior under corrosive environments and tensile stress.

Our SCC testing system comprises two sets of three rings, capable of withstanding a maximum load of 50.000 Newton. Each ring is equipped with a load cell to accurately measure the applied load during testing. The system is adaptable for use with both prismatic and cylindrical samples, and conforms to the testing standards outlined in ECSS 37c (Determination of the susceptibility of metals to stress-corrosion cracking), equivalent to ASTM G44 (Standard Practice for Exposure of Metals and Alloys by Alternate Immersion in Neutral 3.5 % Sodium Chloride Solution).  It is primarily for tests of aluminum alloys and ferrous alloys, but may be used for other metals exhibiting susceptibility to chloride ions at ambient temperature.

The primary objective of the SCC system is to assess the sensitivity of materials to the combined effects of tensile stress and corrosive media. Samples undergo immersion and drying cycles over a 30-day period, simulating real-exposure conditions. Subsequently, tensile testing and microstructure analysis are conducted to evaluate the material's propensity for SCC. Unlike hydraulic systems, our SCC setup continuously monitors and adjusts the applied load during testing, ensuring precise and controlled conditions. Moreover, the system's versatility allows for the development of customized tooling to accommodate different sample shapes and assemblies.

Signs of SCC manifestation include sample rupture, deterioration of mechanical properties, or the presence of specific microstructural defects post-testing. These observations provide valuable insights into the performance of materials under stress-corrosive environments, aiding in the identification of potential vulnerabilities and informing materials selection and design decisions.

For other materials or corrosive environments, CRM can also offer tailor-made systems based on ASTM G38 (Standard Practice for Making and Using C-Ring Stress-Corrosion Test Specimens) or ASTM G39 (Standard Practice for Preparation and Use of Bent-Beam Stress-Corrosion Test Specimens).