Testing for Environmentally Assisted Cracking EAC

This is a very extensive topic involving many variables. It involves the evaluation of the inherent compatibility between a material and the environment under applied or residual stress. Factors such as material type, process history, product form, active cracking mechanisms, loading configuration and geometry and exposure environments can have an impact on the type of sample and test conditions for the evaluation of EAC. 

Alternative to the constant load tensile test, a spring or proof ring is used in place of dead-weight and the load/deflection relationship for the particular geometry is 

Bent beam samples (two-, three-, and four-point loading) in ISO 7539 Part 2, ASTMG538, NACE TM0177 Method B  

C-ring samples per ISO 7539 Part-5, ASTM6 G38, TM0177 Method C  

Precracked specimen configurations for stress-corrosion testing 

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