BS 7448-4:1997
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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Fracture mechanics toughness tests Method for determination of fracture resistance curves and initiation values for stable crack extension in metallic materials
Hardcopy , PDF
08-04-2021
English
07-15-2001
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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 |
| 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 | 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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