ISO 15850:2014
Plastics — Determination of tension-tension fatigue crack propagation — Linear elastic fracture mechanics (LEFM) approach
ISO 15850:2014 specifies a method for measuring the propagation of a crack in a notched specimen subjected to a cyclic tensile load varying between a constant positive minimum and a constant positive maximum value. The test results include the crack length as a function of the number of load cycles and the crack length increase rate as a function of the stress intensity factor and energy release rate at the crack tip. The possible occurrence of discontinuities in crack propagation is detected and reported.
The test can be also used for the purpose of determining the resistance to crack propagation failure. In this case, the results can be presented in the form of number of cycles to failure or total time taken to cause crack propagation failure versus the stress intensity factor.
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Section sec_1
Section sec_2
Section sec_3
Section sec_3.1
Section sec_3.2
Section sec_3.3
Section sec_3.4
Section sec_3.5
Section sec_3.6
Section sec_3.7
Section sec_3.8
Section sec_3.9
Section sec_3.10
Section sec_3.11
Section sec_3.12
Section sec_3.13
Section sec_3.14
Section sec_3.15
Section sec_3.16
Section sec_3.17
Section sec_3.18
Section sec_3.19
Section sec_3.20
Section sec_3.21
Section sec_3.22
Section sec_3.23
Section sec_4
Section sec_5
Section sec_6
Section sec_6.1
Section sec_6.1.1
Section sec_6.1.2
Table tab_b
Figure fig_1
Table tab_c
Figure fig_2
Section sec_6.1.3
Figure fig_3
Section sec_6.2
Section sec_6.3
Section sec_6.4
Section sec_6.5
Section sec_7
Section sec_7.1
Section sec_7.1.1
Section sec_7.1.2
Section sec_7.1.3
Section sec_7.1.4
Section sec_7.2
Section sec_7.3
Section sec_7.3.1
Section sec_7.3.2
Section sec_7.3.3
Section sec_7.3.4
Table tab_f
Figure fig_4
Table tab_1
Section sec_7.3.5
Section sec_7.4
Section sec_8
Section sec_8.1
Section sec_8.2
Section sec_8.3
Section sec_8.4
Section sec_8.5
Section sec_8.6
Section sec_9
Section sec_9.1
Section sec_9.2
Section sec_9.3
Section sec_9.4
Section sec_9.5
Section sec_10
Section sec_10.1
Section sec_10.2
Section sec_10.3
Annex sec_A
Table tab_g
Figure fig_A.1
Table tab_h
Figure fig_A.2
Table tab_i
Figure fig_A.3
Reference ref_1
Reference ref_2
Reference ref_3
Reference ref_4
Reference ref_5
Reference ref_6
Reference ref_7
Reference ref_8
Reference ref_9
Reference ref_10
Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Significance and use
6 Test specimens
6.1 Shape and size
6.2 Preparation
6.3 Notching
6.4 Side grooves
6.5 Conditioning
7 Apparatus
7.1 Test machine
7.2 Grips
7.3 Crack length measurement
7.4 Test atmosphere
8 Test procedure
8.1 Measurement of specimen dimensions
8.2 Specimen mounting
8.3 Loading
8.4 Out-of-plane crack propagation
8.5 Discontinuous crack propagation
8.6 Number of tests
9 Calculation and interpretation of results
9.1 Crack length versus number of cycles
9.2 Crack curvature correction
9.3 Crack growth rate da/dN
9.4 Stress intensity factor range ΔK
9.5 Energy release rate range ΔG
10 Test report
10.1 General
10.2 For fatigue crack propagation test
10.3 For fatigue crack propagation to failure test
Annex A (informative) Abnormality in the use of cyclic fatigue crack propagation test for ranking long-term static fatigue behaviour
Bibliography
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Section sec_1
Section sec_2
Section sec_3
Section sec_3.1
Section sec_3.2
Section sec_3.3
Section sec_3.4
Section sec_3.5
Section sec_3.6
Section sec_3.7
Section sec_3.8
Section sec_3.9
Section sec_3.10
Section sec_3.11
Section sec_3.12
Section sec_3.13
Section sec_3.14
Section sec_3.15
Section sec_3.16
Section sec_3.17
Section sec_3.18
Section sec_3.19
Section sec_3.20
Section sec_3.21
Section sec_3.22
Section sec_3.23
Section sec_4
Section sec_5
Section sec_6
Section sec_6.1
Section sec_6.1.1
Section sec_6.1.2
Table tab_b
Figure fig_1
Table tab_c
Figure fig_2
Section sec_6.1.3
Figure fig_3
Section sec_6.2
Section sec_6.3
Section sec_6.4
Section sec_6.5
Section sec_7
Section sec_7.1
Section sec_7.1.1
Section sec_7.1.2
Section sec_7.1.3
Section sec_7.1.4
Section sec_7.2
Section sec_7.3
Section sec_7.3.1
Section sec_7.3.2
Section sec_7.3.3
Section sec_7.3.4
Table tab_f
Figure fig_4
Table tab_1
Section sec_7.3.5
Section sec_7.4
Section sec_8
Section sec_8.1
Section sec_8.2
Section sec_8.3
Section sec_8.4
Section sec_8.5
Section sec_8.6
Section sec_9
Section sec_9.1
Section sec_9.2
Section sec_9.3
Section sec_9.4
Section sec_9.5
Section sec_10
Section sec_10.1
Section sec_10.2
Section sec_10.3
Annex sec_A
Table tab_g
Figure fig_A.1
Table tab_h
Figure fig_A.2
Table tab_i
Figure fig_A.3
Reference ref_1
Reference ref_2
Reference ref_3
Reference ref_4
Reference ref_5
Reference ref_6
Reference ref_7
Reference ref_8
Reference ref_9
Reference ref_10
Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Significance and use
6 Test specimens
6.1 Shape and size
6.2 Preparation
6.3 Notching
6.4 Side grooves
6.5 Conditioning
7 Apparatus
7.1 Test machine
7.2 Grips
7.3 Crack length measurement
7.4 Test atmosphere
8 Test procedure
8.1 Measurement of specimen dimensions
8.2 Specimen mounting
8.3 Loading
8.4 Out-of-plane crack propagation
8.5 Discontinuous crack propagation
8.6 Number of tests
9 Calculation and interpretation of results
9.1 Crack length versus number of cycles
9.2 Crack curvature correction
9.3 Crack growth rate da/dN
9.4 Stress intensity factor range ΔK
9.5 Energy release rate range ΔG
10 Test report
10.1 General
10.2 For fatigue crack propagation test
10.3 For fatigue crack propagation to failure test
Annex A (informative) Abnormality in the use of cyclic fatigue crack propagation test for ranking long-term static fatigue behaviour
Bibliography