BS ISO 27306:2016 - Metallic materials. Method of constraint loss correction of CTOD fracture toughness for fracture assessment of steel components

BS ISO 27306:2016

Metallic materials. Method of constraint loss correction of CTOD fracture toughness for fracture assessment of steel components

Status : Current   Published : November 2016

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In fracture assessments of steel structures containing cracks, it has generally been assumed that the fracture resistance of fracture toughness specimens is equal to the fracture resistance of structural components. However, such an assumption often leads to excessively conservative fracture assessments. This is due to a loss of plastic constraint in structural components, which are subjected mainly to tensile loading. By contrast, fracture toughness specimens hold a constrained stress state near the crack-tip due to bending mode. The loss of constraint is significant for high strength steels with high yield-to-tensile ratios (= yield stress/tensile strength) which have been extensively developed and widely applied to structures in recent years.

This International Standard specifies a method for converting the CTOD (crack-tip opening displacement) fracture toughness obtained from laboratory specimens to an equivalent CTOD for structural components, taking constraint loss into account. This method can also apply to fracture assessment using the stress intensity factor or the J-integral concept (see Clause 9).

This International Standard deals with the unstable fracture that occurs from a crack-like defect or fatigue crack in ferritic structural steels. Unstable fracture accompanied by a significant amount of ductile crack extension and ductile fractures are not included in the scope hereof.

The CTOD fracture toughness of structural steels is measured in accordance with the established test methods, ISO 121351) or BS 7448‑1. The fracture assessment of a cracked component is done using an established method such as FAD (Failure Assessment Diagram) in the organization concerned, and reference is not made to the details thereof in this International Standard.

This International Standard can be used for eliminating the excessive conservatism frequently associated with the conventional fracture mechanics methods and accurately assessing the unstable fracture initiation limit of structural components from the fracture toughness of the structural steel. This is also used for rationally determining the fracture toughness of materials to meet the design requirements of performance of structural components.




Standard NumberBS ISO 27306:2016
TitleMetallic materials. Method of constraint loss correction of CTOD fracture toughness for fracture assessment of steel components
StatusCurrent
Publication Date30 November 2016
Normative References(Required to achieve compliance to this standard)ISO 12135, BS 7448-1
Informative References(Provided for Information)ASTM E1921-15, BS 7910, WES 2805:2011, ISO 6892-1, ISO 6892-3, API 579-1:2007, ASME FFS-1:2007, JIS G 3106:2008, BS 4360:1990
ReplacesBS ISO 27306:2009
International RelationshipsISO 27306:2016
Draft Superseded By15/30316712 DC
DescriptorsMetals, Steels, Structural steels, Ferritic steels, Crack-opening displacement tests, Fracture, Fracture toughness, Fatigue testing, Mechanical testing, Test specimens, Structural members, Tensile strength, Tensile stress, Mathematical calculations
ICS77.040.10
Title in FrenchMatériaux métalliques. Méthode de correction de perte de contrainte du CTOD de la ténacité à la rupture pour l’évaluation de la rupture des composants en acier
CommitteeISE/101/4
ISBN978 0 580 88918 9
PublisherBSI
FormatA4
DeliveryYes
Pages60
File Size5.287 MB
Price£254.00


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