SEDL / STP / STP631-EB / STP35555S

Experimental Verification of the J^Ic and Equivalent Energy Methods for the Evaluation of the Fracture Toughness of Steels

Marandet, B
Research engineer and head of Steels Properties Group, Institut de Recherches de la Sidérurgie Francaise, Saint Germain en Laye,

Sanz, G
Research engineer and head of Steels Properties Group, Institut de Recherches de la Sidérurgie Francaise, Saint Germain en Laye,

Pages: 15    Published: Jan 1977

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Abstract

The critical value J^Ic and the apparent fracture toughness KBd are measured with a single small specimen (compact tension or three-point-bend bar) loaded in the elastic-plastic range. Initiation is detected during loading by an electrical potential method.

For the steels studied here (2.25Cr-1Mo, electroslag weld, manganese cast steel), the K^Ic values deduced from J^Ic are in agreement with the K^Ic values directly measured with thick specimens in the transition-temperature range. Furthermore, the equivalent energy procedure gives the same results as those obtained by the J-integral method.