BS 6729:1987
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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Method for determination of the dynamic fracture toughness of metallic materials
Hardcopy , PDF
31-08-2007
English
30-01-1987
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Foreword
Committees responsible
Method
1. Scope
2. Definitions
3. Symbols and designations
4. Principle
5. Test pieces
6. Preparation of test piece
7. Test equipment
8. Preliminary procedures
9. Procedure for determination of KIc and COD
10. Test data and calculations
11. Validity check list
12. Test report
Appendices
A. Abbreviated method for determination of dynamic
fracture toughness of metallic materials
B. Recommended methods for checking response of
transducers and recorders
Tables
1. Recommended thickness and crack length of test
pieces used for the measurement of plane strain
fracture toughness
2. Typical series of figure 5 test piece dimensions
3. Stress intensity coefficient (Y1) for test pieces
loaded by three point bending over a span to test
piece width ratio of 4:1
4. Stress intensity coefficient (Y2) for test pieces
loaded in tension
Figures
1. Proportional dimensions and tolerances for test
piece A
2. Proportional dimensions and tolerances for test
piece B
3. Envelope limiting size and form of notch and fatigue
crack
4. Knife edges for location of crack mouth opening
gauges
5. Proportional dimensions and tolerances for test
piece when determinations are made by applying
a tensile force
6. Details of typical crack mouth opening gauge
7. Test fixture for bending test pieces A and B
8. Test fixture for applying tensile force
9. Principal types of force/crack mouth opening gauge
displacement records showing the limits of allowable
force and displacement variation for KIc
determination
10. Force variation limits for plane strain fracture
toughness determination
11. Limits of crack mouth opening gauge displacement
variations for plane strain fracture toughness
determination
12. Types of force/crack mouth opening gauge displace-
ment graphs for calculation of COD
13. Limits of force and crack mouth opening gauge
displacement for COD determination
14. Force and load point displacement variation limits
for crack opening displacement determination
15. Crack mouth opening gauge displacement variation
limits for COD determination
16. Limits of loading point displacement variation
for crack opening displacement determination
17. Examples of good and unacceptable force records
18. Examples of good and unacceptable crack opening
displacement gauge displacement records
19. Test system for d.c. signal conditioners and
amplifiers
20. Example of the amplitude output of an instrument as
a function of the frequency
21. Test system for a.c. transducers
Assessment of crack opening displacement (COD) and plane strain fracture toughness (KIc) at loading rates that cause rates of increase in stress intensity factor between 80 and 105 N·mm$u-1$u.5·s$u-1 and rates of increase of crack opening displacement of less than 150 mm/s.
| Committee |
ISE/101/4
|
| DevelopmentNote |
Supersedes 85/38528 DC (09/2005)
|
| DocumentType |
Standard
|
| Pages |
44
|
| PublisherName |
British Standards Institution
|
| Status |
Superseded
|
| SupersededBy |
| BS 6223:1990 | Specification for friction welding of joints in metals |
| BS 3846:1970 | Methods for calibration and grading of extensometers for testing of metals |
| BS 5762:1979 | Methods for crack opening displacement (COD) testing |
| BS 5447:1977 | Methods of test for plane strain fracture toughness (<i>K</i><sub>Ic</sub>) of metallic materials |
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