ABI Services, LLC (ABIS) provides an alternative to conventional destructive testing for storage and pressure vessels.
The in-situ SSM system performs nondestructive field measurements of local key mechanical properties of pipeline base materials and welds. These properties include the yield strength, true-stress versus true- plastic-strain curve, strain hardening exponent (uniform ductility), strength coefficient, ultimate tensile strength, and initiation fracture toughness (which determines the critical size of service-induced sharp cracks).
The SSM system utilizes an ABI technique that is nondestructive, fast, and very accurate. The ABI test requires a reasonable localized polishing of the test area for indentation testing. The spherical indentations produced on the vessel surface are shallow, smooth depressions (i.e., no sharp edges and, hence, no stress concentration sites). Furthermore, the ABI test leaves a compressive surface residual stress that retards crack initiation (similar to the shot peening process used routinely in the aerospace industry). Therefore the ABI test, although a true/robust mechanical test, is considered for practical purposes nondestructive.