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ASTM E647-2008e1 疲劳裂缝增大率测量用测试方法

ASTM E647-2008e1 疲劳裂缝增大率测量用测试方法

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【英文标准名称】: Standard Test Method for Measurement of Fatigue Crack Growth Rates
【原文标准名称】: 疲劳裂缝增大率测量用测试方法
【标准号】: ASTM E647-2008e1
【标准状态】: 现行
【国别】: 美国
【发布日期】: 2008
【实施或试行日期】:
【发布单位】: 美国材料与试验协会(US-ASTM)
【起草单位】: E08.06
【标准类型】: (Test Method)
【标准水平】: ()
【中文主题词】:
【英文主题词】: constant amplitude; crack size; fatigue crack growth rate; stress intensity factor range; Cracking--crack growth; Constant-load-amplitude fatigue crack growth rates; Fatigue
【摘要】: Fatigue crack growth rate expressed as a function of crack-tip stress-intensity factor range, da/dN versus x0394;K, characterizes a material''s resistance to stable crack extension under cyclic loading. Background information on the ration-ale for employing linear elastic fracture mechanics to analyze fatigue crack growth rate data is given in Refs (1) and (2).1.1 This test method covers the determination of fatigue crack growth rates from near-threshold to Kmax controlled instability. Results are expressed in terms of the crack-tip stress-intensity factor range (x0394;K), defined by the theory of linear elasticity. 1.2 Several different test procedures are provided, the optimum test procedure being primarily dependent on the magnitude of the fatigue crack growth rate to be measured. 1.3 Materials that can be tested by this test method are not limited by thickness or by strength so long as specimens are of sufficient thickness to preclude buckling and of sufficient planar size to remain predominantly elastic during testing. 1.4 A range of specimen sizes with proportional planar dimensions is provided, but size is variable to be adjusted for yield strength and applied force. Specimen thickness may be varied independent of planar size. 1.5 The details of the various specimens and test configurations are shown in Annex A1-Annex A3. Specimen configurations other than those contained in this method may be used provided that well-established stress-intensity factor calibrations are available and that specimens are of sufficient planar size to remain predominantly elastic during testing. 1.6 Residual stress/crack closure may significantly influence the fatigue crack growth rate data, particularly at low stress-intensity factors and low stress ratios, although such variables are not incorporated into the computation of x0394;K. 1.7 Values stated in SI units are to be regarded as the standard. Values given in parentheses are for information only. 1.8 This test method is divided into two main parts. The first part gives general information concerning the recommendations and requirements for fatigue crack growth rate testing. The second part is composed of annexes that describe the special requirements for various specimen configurations, special requirements for testing in aqueous environments, and procedures for non-visual crack size determination. In addition, there are appendices that cover techniques for calculating da/dN, determining fatigue crack opening force, and guidelines for measuring the growth of small fatigue cracks. General information and requirements common to all specimen types are listed as follows:
【中国标准分类号】: H22
【国际标准分类号】: 77_040_10
【页数】: 45P.;A4
【正文语种】: 英语

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ASTM[1] E647-2[1]

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