Effect of specimen size in static and dynamic fracture toughness testing of reactor vessel steel A508cl.3

• Published in: ISIJ international Vol. 35; no. 4; pp. 419 - 425
• Main Authors: SUGIURA, N, ISOBE, E, YAMAMOTO, I, KOBHAYASHI, T
• Format: Journal Article
• Language: English
• Published: Tokyo Iron and Steel Institute of Japan 1995
• Subjects: Applied sciences; Exact sciences and technology; Fractures; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology; Metals. Metallurgy; Charpy impact test; Size effect; Rupture; Mechanical properties; Reactor material; Steel; Experimental study; Dynamic load; Static load; Fracture toughness
• ISSN: 0915-1559
• DOI: 10.2355/isijinternational.35.419

The fracture toughness must be evaluated under the dynamic loading condition, when the materials are used for structures that are desired to a higher safety and must be taken into account of the effect of dynamic loading. Moreover, in order to obtain the valid Jlc value, a criterion concerning both specimen thickness B and ligament width bo must be satisfied, which is called as "valid condition" and is described as the following equation. B,bo > = alpha(Jin/sigmafs), (x-25) However, this equation is presented for the static loading condition and there is not assurance to be able to apply for the case of dynamic loading one. Therefore, under static and dynamic loading conditions, the effects of both B and bo on Jin value and the flow stress sigmafs are investigated and the valid conditions are discussed. The results are presented that the factor x of the above equation is reduced as 20 for bo and is increased as 28 for B under dynamic loading condition. 3 tabs., 11 figs., 16 refs.