engleski

New engineering concepts of structural integrity

The historic development of fracture mechanics has led to the creation of numerous national and international standards describing the experimental determination of just one material property: the resistance to crack extension. For example, the Book of Standards of American Society of Testing and Materials (ASTM) contain 10 standards (f.e. ASTM E 399-90 standard test method for plane– ; ; strain fracture toughness of metallic materials or ASTM E 813 for JIC measurement), British standard BS 7910:2000 presents the guide on methods for assessing the acceptability of flaws in metallic structures etc. In the ESIS P2-92 document European Structural Integrity Society (ESIS) describes the procedure for determining the fracture behaviour of materials from the linear elastic regime to the fully plastic regime. However, the physical definitions of fracture toughness are frequently not compatible with each other. Furthermore, it is not enough for structure integrity assessment to determinate the fracture toughness of the structure and to compare it with its critical value. For this purpose two different procedures have been developed: R6-Routine based on Failure Assessment Diagram (FAD philosophy) and Engineering Treatment Model (ETM) with basic concept of Crack Driving Force (CDF). Both procedures are included in the new European SINTAP project (Structural INTegrity Assessment Procedures for European Industry), which is developing as a draft for subsequent standardisation of fracture mechanics based flaw assessment methods on a European level. The EU commission sponsored this project in which 17 research institutions and industrial companies were involved. This article reviews the basic principles of the SINTAP procedure.

ntegrity assessment; R6 routine; FAD; crack driving force; ETM model; SINTAP procedure

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