Tazilkree Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. A number in parentheses indicates the year of last reapproval. Fatigue Precracking KIc Specimens. Work Item s — proposed revisions of this standard.
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More E KIc may also be expected to rise with increasing ligament size. The present test method does not apply to such materials and the user is referred to Test Method E and E Likewise this test method does not apply to high toughness or high tearing-resistance materials whose failure is accompanied by appreciable amounts of plasticity. Guidance on testing elastic-plastic materials is given in Test Method E Background information concerning the basis for development of this test method in terms of linear elastic fracture mechanics may be found in Refs 1 and 2.
Crack extension under cyclic or sustained forces as by stress corrosion cracking or creep crack growth can be influenced by temperature and environment. Therefore, when KIc is applied to the design of service components, differences between laboratory test and field conditions shall be considered. Therefore, compliance with the specified validity criteria of this test method is essential.
The effect can be especially significant for specimens removed from as-heat treated or otherwise non-stress relieved stock, from weldments, from complex wrought parts, or from parts with intentionally induced residual stresses. Indications of residual stress include distortion during specimen machining, results that are specimen configuration dependent, and irregular fatigue precrack growth either excessive crack front curvature or out-of-plane growth. Guide B provides supplementary guidelines for plane strain fracture toughness testing of aluminum alloy products for which complete stress relief is not practicable.
Guide B includes additional guidelines for recognizing when residual stresses may be significantly biasing test results, methods for minimizing the effects of residual stress during testing, and guidelines for correction and interpretation of data.
The specification of KIc values in relation to a particular application should signify that a fracture control study has been conducted for the component in relation to the expected loading and environment, and in relation to the sensitivity and reliability of the crack detection procedures that are to be applied prior to service and subsequently during the anticipated life.
Scope 1. Details of test apparatus, specimen configuration, and experimental procedure are given in the annexes. Two procedures are outlined for using the experimental data to calculate fracture toughness values: 1. This can lead to a specimen size dependent rising fracture toughness resistance curve, with larger specimens producing higher fracture toughness results. The KIsi test procedure is based on a fixed amount of crack extension of 0. This less size-sensitive fracture toughness, KIsi, is called size-insensitive throughout this test method.
Appendix X1 contains an optional procedure for reinterpreting the force-displacement test record recorded as part of this test method to calculate the additional fracture toughness value, KIsi. The first part gives general recommendations and requirements for testing and includes specific requirements for the KIc test procedure. The second part consists of Annexes that give specific information on displacement gage and loading fixture design, special requirements for individual specimen configurations, and detailed procedures for fatigue precracking.
Additional annexes are provided that give specific procedures for beryllium and rapid-force testing, and the KIsi test procedure, which provides an optional additional analysis procedure for the test data collected as part of the KIc test procedure.
ASTM E399-90 PDF
It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations awtm to use. Likewise this test method does not apply to high toughness or high tearing-resistance materials whose failure is accompanied by appreciable amounts of plasticity. The values given in parentheses are for information only. This strength ratio is a e of the maximum load the specimen can sustain, its initial dimensions and the yield strength of the material. Link to Active This link will always route to the current Active version of the standard. The second part consists of Annexes that give specific information on displacement gage and loading fixture design, special requirements for individual specimen configurations, and detailed procedures for fatigue precracking.
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