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BS 7448-4:1997

Superseded
Superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

View Superseded by
superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

Fracture mechanics toughness tests Method for determination of fracture resistance curves and initiation values for stable crack extension in metallic materials
Available format(s)

Hardcopy , PDF

Superseded date

04-08-2021

Language(s)

English

Published date

15-07-2001

Method
1 Scope
2 References
3 Definitions
4 Symbols and designations
5 Principle
6 Test specimens
7 Specimen preparation and fatigue precracking
8 Test equipment
9 Multiple specimen test procedure
10 Single specimen test procedure
11 Analysis of test data
12 Construction of R-curves
13 Derivation of fracture parameters
14 Check lists for qualification of data
15 Test report
Annexes
A (informative) Bibliography
B (normative) Crack plane identification
C (informative) Measurement of load-line displacement, q, in
    a three point bend test
D (informative) Single specimen methods
E (normative) Analytical methods for the determination of
    Vp and Up
F (normative) Offset power law fit to crack extension
    fracture resistance data
Tables
1 Values of g1 (ao/W) for three point bend specimens
2 Values of g2 (ao/W) for compact specimens
Figures
1 Flow chart for the test method
2 Proportional dimensions and tolerances for a single edge
    notch bend specimen
3 Proportional dimensions and tolerances for a straight
    notch compact specimen
4 Proportional dimensions and tolerances for a stepped
    notch compact specimen
5 Acceptable fatigue crack starter notches and fatigue crack
    configurations
6 Outward pointing knife edges and corresponding notch
    geometries
7 Inward pointing knife edges and corresponding notch
    geometries
8 Typical sidegrooved specimen
9 Fixture for three point bend tests
10 Typical design of clevis for applying a tensile force to a
    compact specimen
11 Typical design of clevis for applying a tensile force to
    a compact specimen (suitable for the single specimen
    method employing the unloading compliance technique)
12 Measurement of crack lengths on single edge notch bend
    specimens
13 Measurement of crack lengths on compact specimens
14 Single specimen crack extension termination requirement
15 Graphical determination of Vp
16 Determination of Up
17 Data spacing and curve fit
18 Limits to delta or J controlled crack extensions
19 Derivation of delta0.2BL and Jo.2BL
20 Derivation of delta0.2 and J0.2
    B.1 Basic fracture plane identification: rectangular
          section
    B.2 Basic fracture plane identification: cylindrical
          sections
    B.3 Non-basic fracture plane identification
    C.1 Schematic representation of the 'comparator' box
    C.2 Displacements associated with single edge notch
          bend specimens
    C.3 Determination of extraneous displacements for single
          edge notch bend specimens
    C.4 Location of two notch opening displacement
          measurements (V1 and V2) for the determination of
          load-line displacement
    F.1 General form of the offset power law expression
          y = m + l(deltaa)x
List of references

Specifies a method for determining the crack extension resistance of fully ductile metallic materials using fatigue pre-cracked specimens.

Committee
ISE/101
DevelopmentNote
Supersedes 93/301852 DC (10/2005) Reviewed and confirmed by BSI, March 2007. (02/2007)
DocumentType
Standard
Pages
54
PublisherName
British Standards Institution
Status
Superseded
SupersededBy
Supersedes

ISO 12135:2016 Metallic materials Unified method of test for the determination of quasistatic fracture toughness
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
I.S. EN ISO 19902:2007 PETROLEUM AND NATURAL GAS INDUSTRIES - FIXED STEEL OFFSHORE STRUCTURES
EN ISO 19902:2007/A1:2013 PETROLEUM AND NATURAL GAS INDUSTRIES - FIXED STEEL OFFSHORE STRUCTURES (ISO 19902:2007/AMD 1:2013)
04/19985213 DC : DRAFT NOV 2004 ISO 19902 - PETROLEUM AND NATURAL GAS INDUSTRIES - FIXED STEEL OFFSHORE STRUCTURES
UNI EN ISO 19902 : 2013 PETROLEUM AND NATURAL GAS INDUSTRIES - FIXED STEEL OFFSHORE STRUCTURES
15/30293838 DC : 0 BS ISO 12135 - METALLIC MATERIALS - UNIFIED METHOD OF TEST FOR THE DETERMINATION OF QUASISTATIC FRACTURE TOUGHNESS
DEFSTAN 02-874/1(2004) : 2004 TESTING ROUTE FOR THE ASSESSMENT OF NEW SUBMARINE HULL STEELS
BS 7448-2:1997 Fracture mechanics toughness tests Method for determination of KIc, critical CTOD and critical J values of welds in metallic materials
ISO 19902:2007 Petroleum and natural gas industries Fixed steel offshore structures
API TR 1PER15K-1 : 2013 PROTOCOL FOR VERIFICATION AND VALIDATION OF HIGH-PRESSURE HIGH-TEMPERATURE EQUIPMENT

BS 7448-1:1991 Fracture mechanics toughness tests Method for determination of KIc, critical CTOD and critical J values of metallic materials
BS 3846:1970 Methods for calibration and grading of extensometers for testing of metals
BS EN 10002-2:1992 Tensile testing of metallic materials Verification of the force measuring system of the tensile testing machine
BS 427:1990 Method for Vickers hardness test and for verification of Vickers hardness testing machines

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