ASTM E1681-2003 Standard Test Method for Determining a Threshold Stress Intensity Factor for Environment-Assisted Cracking of Metallic Materials《测定金属材料环境致裂的界限应力强度因子的标准试验方法》.pdf
《ASTM E1681-2003 Standard Test Method for Determining a Threshold Stress Intensity Factor for Environment-Assisted Cracking of Metallic Materials《测定金属材料环境致裂的界限应力强度因子的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM E1681-2003 Standard Test Method for Determining a Threshold Stress Intensity Factor for Environment-Assisted Cracking of Metallic Materials《测定金属材料环境致裂的界限应力强度因子的标准试验方法》.pdf(13页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: E 1681 03Standard Test Method forDetermining Threshold Stress Intensity Factor forEnvironment-Assisted Cracking of Metallic Materials1This standard is issued under the fixed designation E 1681; the number immediately following the designation indicates the year oforiginal adoption or, i
2、n the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers the determination of theenvironment-assisted cracking thr
3、eshold stress intensity factorparameters, KIEACand KEAC, for metallic materials fromconstant-force testing of fatigue precracked beam or compactfracture specimens and from constant-displacement testing offatigue precracked bolt-load compact fracture specimens.1.2 This test method is applicable to en
4、vironment-assistedcracking in aqueous or other aggressive environments.1.3 Materials that can be tested by this test method are notlimited by thickness or by strength as long as specimens are ofsufficient thickness and planar size to meet the size require-ments of this test method.1.4 A range of spe
5、cimen sizes with proportional planardimensions is provided, but size may be variable and adjustedfor yield strength and applied force. Specimen thickness is avariable independent of planar size.1.5 Specimen configurations other than those contained inthis test method may be used, provided that well-
6、establishedstress intensity calibrations are available and that specimendimensions are of sufficient size to meet the size requirementsof this test method during testing.1.6 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility
7、of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:D 1141 Specification for Substitute Ocean Water2E8 Methods for Tension Testing of Metallic Materials3E
8、399 Test Method for Plane-Strain Fracture Toughness ofMetallic Materials3E 647 Test Method for Measurement of Fatigue CrackGrowth Rates3E 1823 Terminology Relating to Fatigue and Fracture Test-ing3G1 Practice for Preparing, Cleaning, and Evaluating Cor-rosion Test Specimens4G5 Standard Reference Met
9、hod for Making Potentiostaticand Potentiodynamic Anodic Polarization Measurements4G15 Terminology Relating to Corrosion and CorrosionTesting43. Terminology3.1 Definitions:3.1.1 For definitions of terms relating to fracture testingused in this test method, refer to Terminology E 1823.3.1.2 For defini
10、tions of terms relating to corrosion testingused in this test method, refer to Terminology G15.3.1.3 stress-corrosion cracking (SCC)a cracking processthat requires the simultaneous action of a corrodent andsustained tensile stress.3.1.4 stress intensity factor threshold for plane strainenvironment-a
11、ssisted cracking (KIEACFL3/2)the highestvalue of the stress intensity factor (K) at which crack growth isnot observed for a specified combination of material andenvironment and where the specimen size is sufficient to meetrequirements for plane strain as described in Test MethodE 399.3.1.5 stress in
12、tensity factor threshold for environment-assisted cracking (KEACFL3/2)the highest value of thestress intensity factor (K) at which crack growth is notobserved for a specified combination of material and environ-ment and where the measured value may depend on specimenthickness.3.1.6 physical crack si
13、ze (apL)the distance from areference plane to the observed crack front. This distance mayrepresent an average of several measurements along the crackfront. The reference plane depends on the specimen form, andit is normally taken to be either the boundary or a planecontaining either the loadline or
14、the centerline of a specimen orplate. The reference plane is defined prior to specimen defor-mation.3.1.7 original crack size (aoL)the physical crack size atthe start of testing.1This test method is under the jurisdiction of ASTM Committee E08 on Fatigueand Fracture and is the direct responsibility
15、of Subcommittee E08.06 on CrackGrowth Behavior.Current edition approved Sept. 10, 2003. Published November 2003. Originallyapproved in 1995. Last previous edition approved in 1999 as E 1681 - 99e1.2Annual Book of ASTM Standards, Vol 11.02.3Annual Book of ASTM Standards, Vol 03.01.4Annual Book of AST
16、M Standards, Vol 03.02.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.3.1.8 original uncracked ligament (boL)distance fromthe original crack front to the back edge of the specimen (bo=Wao).3.1.9 specimen thickness (BL)the side-to-si
17、de dimen-sion of the specimen being tested.3.1.10 tensile strength (sTSFL2)the maximum tensilestress that a material is capable of sustaining. Tensile strengthis calculated from the maximum force during a tension testcarried to rupture and the original cross-section area of thespecimen.3.2 Definitio
18、ns of Terms Specific to This Standard:3.2.1 environment-assisted cracking (EAC)a crackingprocess in which the environment promotes crack growth orhigher crack growth rates than would occur without thepresence of the environment.3.2.2 normalized crack size (a/W)the ratio of crack size,a, to specimen
19、width, W. Specimen width is measured from areference position such as the front edge in a bend specimen orthe loadline in the compact specimen to the back edge of thespecimen.3.2.3 yield strength (sYSFL2)the stress at which amaterial exhibits a specific limiting deviation from the propor-tionality o
20、f stress to strain. This deviation is expressed in termsof strain.NOTE 1In this test method, the yield strength determined by the 0.2 %offset method is used.3.2.4 effective yield strength (sYFL2)an assumed valueof uniaxial yield strength that represents the influences ofplastic yielding upon fractur
21、e test parameters. For use in thismethod, it is calculated as the average of the 0.2 % offset yieldstrength sYS, and the ultimate tensile strength, sTS,orsY5 sYS1sTS! / 2 (1)3.2.5 notch length (an(L)the distance from a referenceplane to the front of the machined notch. The reference planedepends on
22、the specimen form and normally is taken to beeither the boundary or a plane containing either the loadline orthe centerline of a specimen or plate. The reference plane isdefined prior to specimen deformation.4. Summary of Test Method4.1 This test method involves testing of single-edge notchedSE(B) s
23、pecimens, compact C(T) specimens, or bolt-loadcompact MC(W) specimens, precracked in fatigue. Thesingle-edge notched beam specimen is tested by dead weightloading. An environmental chamber is either attached to thespecimen, or the specimen is contained within the chamber.The chamber must enclose the
24、 portion of the specimen wherethe crack tip is located. Prescribed environmental conditionsmust be established and maintained within the chamber at alltimes during the test.4.1.1 Specimens shall be deadweight loaded or otherwiseheld under constant force or held under constant displacement(defined in
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