Available fracture toughness (FT) test methodologies are reviewed in this publication to compare their details. Accurate characterization is crucial to obtain the material properties utilized in new technology development projects such as high pressure high temperature (HPHT) equipment in sour service. While fracture mechanics was utilized only for fitness for service activities in the industry, the new HPHT design guideline requires fracture mechanics analysis for a pressure containing primary barrier equipment. Therefore, FT becomes a critical parameter to be obtained and utilized in design verification. Selection of a test method (standard) for sour service condition is based on the application of the equipment since each method has its own limitations.
In this work, a comprehensive study was performed to better understand the FT testing in a corrosive environment. Seven common standards, ASTM E399, ASTM E1820, ASTM E1681, ASTM F1624, ISO 12135, BS7448 and NACE TM0177 for FT testing of Metals were scrutinized in details. These standards were reviewed; pros and cons are tabulated and discussed. Recommendations that could be used in decision making process to select the right standard for the appropriate purposes are noted. Additionally, future research work that would help to obtain more accurate test data is recommended.
Keywords: conference papers, Fracture toughness, sour service, high pressure high temperature, ASTM E1820, ASTM E1681, ASTM E399, ASTM F1624, ISO 12135, NACE TM0177, fitness for service, design verification