BS 6835-1:1998

Committees responsible
Foreword
1 Scope
2 Normative references
3 Definitions
4 Symbols and units
5 Principle
6 Testing equipment and measuring accuracy
7 Specimens
8 Stress intensity factors
9 Crack length
10 Test procedure
11 Data analysis
12 Test report
Annex A (normative) Grips and fixtures
Annex B (informative) Information on methods for measuring
        crack lengths
Annex C (normative) Stress intensity factor functions
Annex D (informative) Specimen size recommendations
Figure 1 - Three-point single edge notch bend specimen (SENB3)
Figure 2 - Four-point single edge notch bend specimen (SENB4)
Figure 3 - Compact tension specimen (CT)
Figure 4 - Centre-cracked tension specimen (CCT)
Figure 5 - Permitted notch geometry
Figure A.1 - Test fittings for SENB3 specimens (See A.1)
Figure A.2 - Test fittings for SENB4 specimens (see A.2)
Figure A.3 - Recommended test fittings for CT specimens (see A.3)
Figure A.4 - Recommended test fittings for pin loaded CCT
             specimens (see A.4)
Figure A.5 - Typical steel end-plate design for 250 mm wide
             aluminium alloy centre-cracked sheet specimen,
             100 kN maximum load, R > 0
Table 1 - Dimensions of specimens
Table C.1 - Stress intensity factor function values for
            SENB3 specimens
Table C.2 - Stress intensity factor function values for
            SENB4 specimens
Table C.3 - Stress intensity factor function values for
            CT specimens
Table C.4 - Stress intensity factor function values for
            CCT specimens

Gives a method that determines the growth rate of a fatigue crack at ambient temperature as a function of the cyclic range of the crack tip stress intensity factor. It is limited to metal specimens tested in air that remain predominantly elastic, and to constant amplitude, sinusoidal or triangular waveform loadings which only induce crack face displacements perpendicular to the crack plane. Crack growth rates below 10-8m/cycle and threshold stress intensity factor ranges are not covered. The method is restricted to cases where the crack advances on a nominally straight front across the thickness of the specimen.