Abstract

To develop a simplified evaluation method for brittle crack arrest toughness in a heavy-thick plate, the correlation between large-scale test (such as ESSO test) and small-scale tests (such as NRL dropweight test and Charpy V-notch impact test) was investigated. It was found that nil-ductility transition temperature obtained by the NRL drop-weight test at the surface layer and fracture appearance transition temperature (vTrs) obtained by the Charpy V-notch impact test at the quarter thickness position have a high correlation with brittle crack arrest toughness. A simplified evaluation equation for arrest toughness was suggested by combining the results of the small-scale tests. It was confirmed that the developed equation can be applied for various steels independent of the chemical composition and the manufacturing process.

Keywords:
thickness, vtr, toughness, machine learning, steel plate, ndtt, specimen, correlation, chemical composition, equation
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2015. International Society of Offshore and Polar Engineers
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