BS 8571:2018
$142.49
Method of test for determination of fracture toughness in metallic materials using single edge notched tension (SENT) specimens
| Published By | Publication Date | Number of Pages |
| BSI | 2018 | 30 |
This British Standard gives methods for determining fracture toughness in metallic materials in terms of δ (crack tip opening displacement, CTOD) and J (experimental equivalent of the J-integral) using single edge notched tension (SENT) specimens.
This British Standard also gives a method for determining fracture toughness as a resistance to ductile crack extension (R-curve), or single point determination of fracture toughness at onset of unstable crack extension, or pop-in. The method uses specimens which have been notched and fatigue pre-cracked into parent metal, weld metal or heat affected zone (HAZ). The specimens are loaded in tension, and the force and crack mouth opening displacement are recorded.
NOTE Methods to evaluate the suitability of a weld for notch placement within the target area and, where appropriate, to evaluate the effectiveness of the fatigue crack in sampling these areas are given in BS EN ISO 15653.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 4 | Foreword |
| 7 | 1 Scope 2 Normative references 3 Terms, definitions and symbols |
| 8 | 4 Principle |
| 9 | 5 Test sample and test specimen preparation 5.1 Test sample 5.2 Test specimen |
| 10 | Figure 1 — Flowchart showing how to use the standard |
| 11 | Figure 2 — SENT test specimen configuration |
| 13 | Figure 3 — W/B ratios in SENT test specimens |
| 14 | Figure 4 — Machining tolerances and surface finish for a SENT specimen 5.3 Notching |
| 15 | Figure 5 — Crack plane orientation code for fracture toughness specimens of parent metal and weld metal |
| 16 | 5.4 Fatigue pre-cracking 6 Test procedure 6.1 Measurements during testing |
| 17 | Figure 6 — Example knife edges and notch geometries 6.2 Test specimen temperature |
| 18 | 6.3 Testing rate 6.4 Post-test measurements 7 Determination of resistance curves δ–Δa and J–Δa 7.1 General 7.2 Multiple specimen method |
| 19 | 7.3 Single specimen methods 7.4 Calculating J |
| 20 | Figure 7 — Determination of Up, Vp and Ve |
| 22 | 7.5 Calculating CTOD |
| 23 | Figure 8 — Determination of CTOD (δ) from the double clip gauge arrangement 7.6 Definition of the R-curve |
| 24 | Figure 9 — Fitting the R-curve to the SENT crack extension data 7.7 Assessment of pop-ins 8 Determination of single point fracture toughness |
| 25 | 9 Test data qualification 9.1 Checklist for qualification 9.2 Test report |
| 26 | Annex A (informative) Guidance for stable crack path deviation during ductile crack extension |
| 27 | Annex B (informative) Guidance for using non-fatigue pre-cracked specimens Annex C (informative) Example calculation of J and CTOD for SENTs |
| 29 | Bibliography |
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