BS 7448-1:1991:2002 Edition
$189.07
Fracture mechanics toughness tests – Method for determination of KIc, critical CTOD and critical J values of metallic materials
| Published By | Publication Date | Number of Pages |
| BSI | 2002 | 48 |
A method for determining critical fracture toughness and crack tip opening displacement for metallic materials under displacement controlled monotonic loading at quasi static rates.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 1 | BRITISH STANDARD |
| 2 | Committees responsible for this British�Standard |
| 3 | Contents |
| 7 | 1 Scope 2 Definitions stress intensity factor opening mode plane strain fracture toughness maximum fatigue stress intensity factor crack tip opening displacement (CTOD) critical CTOD J- |
| 8 | J critical brittle crack extension stable crack extension stretch zone width (SZW) pop-in 3 Symbols and designations |
| 10 | 4 Principle 5 Test specimens 6 General |
| 11 | Figure 1 Flow chart for choice of fracture toughness parameter, specimen design and displacement measurement |
| 12 | Figure 2 Proportional dimensions and tolerances for a rectangular section bend specimen Figure 3 Proportional dimensions and tolerances for a square section bend specimen |
| 13 | Figure 4 Proportional dimensions and tolerances for a straight notch compact specimen |
| 14 | Figure 5 Proportional dimensions and tolerances for a stepped notch compact specimen |
| 15 | Choice of specimen design Specimen dimensions necessary for a valid determination of Table 1 Dimensions of specimens that may lead to valid 6 Specimen preparation and fatigue precracking Material condition |
| 16 | Crack plane orientation Machining Figure 6 Acceptable fatigue crack starter notches and fatigue crack configurations (see |
| 17 | Figure 7 Chevron notch |
| 18 | Figure 8 Outward pointing knife edges and corresponding notch geometries (see |
| 19 | Figure 9 Inward pointing knife edges and corresponding notch geometries (see |
| 20 | Figure 10 Fixture for three point bend tests Fatigue precracking |
| 22 | Table 2 |
| 24 | Table 3 7 Test equipment Calibration Force application |
| 25 | Displacement measuring devices Monitoring and recording equipment Testing fixtures |
| 26 | Figure 11 Typical design of clevis for applying a tensile force to a compact specimen using a circular hole… |
| 27 | Figure 12 Typical design of clevis for applying a tensile force to a compact specimen using a hole with a f… |
| 28 | 8 Test procedure Specimen measurement Three point bend testing Compact tension testing |
| 29 | Figure 13 Specimen test temperature Testing Recording |
| 30 | Crack measurements after testing to fracture |
| 31 | 9 Analysis of test data General Determination of plane strain fracture toughness, |
| 34 | Determination of CTOD |
| 35 | Figure 16 |
| 36 | Determination of |
| 37 | Figure 17 |
| 38 | 10 Validity check lists General Specimen dimensions Other items |
| 39 | 11 Test report |
| 40 | Appendix A Bibliography Appendix B Crack plane identification |
| 42 | Figure 20 Non-basic fracture plane identification |
| 43 | Appendix C Measurement of load-line displacement ( Figure 21 Principle of the “comparator” bar measurement |
| 44 | Figure 22 Displacements associated with three point bend specimens Figure 23 Simultaneous determination of extraneous displacements |
| 45 | Figure 24 Location of two notch opening displacement measurements |
