BS 7448 Fracture mechanics toughness tests

ir_71 · (This post was last modified: 12-23-2010, 10:58 AM by ir_71.)

Fracture mechanics toughness tests. Method for determination of KIc, critical CTOD and critical J values of metallic materials

Replaced By BS EN ISO 12737:1999, Partially replaced by BS EN ISO 12737:1999.
(missing pages)

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BS 7448-2:1997 Fracture mechanics toughness tests. Method for determination of KIc, critical CTOD and critical J values of welds in metallic materials

Replaced By BS EN ISO 15653:2010

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BS 7448-3:2005 Fracture mechanics toughness tests. Method for determination of fracture toughness of metallic materials at rates of increase in stress intensity factor greater than 3.0 MPa m0.5 s-1

This part of BS 7448 describes a method for determining the opening mode plane strain fracture toughness
KIc, the critical crack tip opening displacement (CTOD) fracture toughness and the critical J fracture
toughness of metallic materials. The method uses fatigue precracked specimens tested in displacement
control at rates of increase in stress intensity factor greater than 3.0 MPa·m0.5sp1 but less than
3 000 MPa·m0.5sp11) during the initial elastic deformation. Stress intensity factors greater than
3 000 MPa·m0.5sp1 are covered in Annex A. These rates are greater than those permitted in BS 7448-1.
The definition of fracture toughness values relevant to particular structural integrity assessments is
outside the scope of this British Standard.
NOTE This standard does not cover integrity assessments. Such assessments are covered in BS 7910.

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BS 7448-4:1997 Fracture mechanics toughness tests. Method for determination of fracture resistance curves and initiation values for stable crack extension in metallic materials

This Part of BS 7448 gives a method for determining the resistance to stable crack extension of metallic
materials. The method uses fatigue precracked specimens. These are tested in displacement controlled
loading at a constant rate of increase in stress intensity factor within the range 0.5 MPa·m0.5s–1
to 3.0 MPa·m0.5s–1 1) during the initial elastic deformation. Resistance to crack extension is characterized
in terms of the variation in crack tip opening displacement (CTOD) and/or J with stable crack extension.
These characterizations are referred to in this standard as and J R-curves, respectively.
The method is only suitable for tests on specimens that exhibit stable crack extension. If unstable fracture
or crack arrest occurs in any of the tests in an R-curve determination it is necessary also to assess the test
results in accordance with BS 7448-1.
Testing requirements and analysis procedures are given which enable crack extension resistance curves to
be calculated from both straight notch and stepped notch compact specimens and single edge notch bend
specimens. Individual fracture parameters are also defined for CTOD and J at a point where stable crack
extension is close to the onset of initiation.
The definition of fracture toughness values relevant to particular structural integrity assessments is
outside the scope of this British Standard.
NOTE Publications of relevance to the subject matter covered by this Part of BS 7448 are listed in the bibliography in Annex A.
A system of crack plane identification is given in Annex B.

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andersen3 · 02-08-2013, 10:14 AM

all links dead; mirror for all of them

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password

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