Standard Test Methods Using Haggag Tensile and Toughness Method (HTTM)
Haggag, F.M., "Standard Test Methods for: Nondestructive and Localized Determination of Stress-Strain Curve and Initiation Fracture Toughness of Ferritic Steel Samples and Structures Using Haggag Tensile and Toughness Method (HTTM)," ABI® Services LLC, November 2015 (updated 2018).
The HTTM (Haggag Tensile and Toughness Method) Standard specification document is ABI® Services' formal written standard that aligns with ASTM E636-14 and incorporates precision data from the L52280 interlaboratory study that included PRCI. It defines test procedures, equipment requirements, data analysis algorithms, and acceptance criteria for ABI®/SSM® testing.
The HTTM Standard serves as the authoritative procedural document for ABI® testing, analogous to ASTM test method standards for conventional testing techniques. It specifies the indenter geometry, loading protocol, data acquisition requirements, analysis algorithms for extracting yield strength, flow curve, and fracture toughness, and the precision and bias data from the L52280 interlaboratory study.
The document forms the technical basis for the pending ASTM E28 standardization effort that would formalize ABI® as an ASTM standard test method. Its alignment with ASTM E636-14 ensures that ABI® results are directly usable in the nuclear reactor surveillance framework.