ASTM B528-2005 Standard Test Method for Transverse Rupture Strength of Metal Powder Specimens《金属粉末试样的横向断裂强度的标准试验方法》.pdf

1、Designation: B 528 05Standard Test Method forTransverse Rupture Strength of Metal Powder Specimens1This standard is issued under the fixed designation B 528; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision

2、. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This test method covers determination of the transverserupture strength of sintered, including post-treated, metalpowder test spe

3、cimens by subjecting them to a uniformlyincreasing transverse force under controlled conditions. Theterm “transverse rupture strength” as used herein, defines thestress, calculated from the flexure formula required to break aspecimen as a simple beam supported near the ends andapplying the force mid

4、way between the fixed line center of thesupports.1.2 Limitations The transverse rupture test is only appli-cable to relatively brittle materials. In cases where a ductilespecimen is being tested and the permanent deflection as aresult of testing exceeds 0.020 in. (0.50 mm), the test resultsmay be qu

5、estionable.1.3 Test Method B 406 should be consulted for determiningthe transverse rupture strength of cemented carbides.1.4 The values stated in inch-pound units are to be regardedas the standard. The SI values are provided for informationonly.1.5 This standard does not purport to address all of th

6、esafety concerns, if any, associated with its use. It is theresponsibility 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:2B 243 Terminology of Powder

7、 MetallurgyB 312 Test Method for Green Strength for CompactedMetal Powder SpecimensB 406 Test Method for Transverse Rupture Strength ofCemented CarbidesB 925 Practices for Production and Preparation of PowderMetallurgy (P/M) Test Specimens3. Terminology3.1 DefinitionsFor definitions of terms in this

8、 test method,see Terminology B 243.4. Significance and Use4.1 This test method is used to measure the strength ofsintered, including post-treated, specimens. Transverse rupturestrength is not a design value. For many sintered materials,transverse rupture strength is approximately twice the ultimatet

9、ensile strength.5. Apparatus5.1 Micrometer, capable of measuring with a resolution of0.0001 in. (0.002 mm).5.2 Transverse Rupture Strength Fixture, as shown in Fig. 1.5.3 Compression Testing Machine, capable of applying abreaking force on the test specimen with an accuracy of 1.0 %and readable to th

10、e nearest 10 lbf (50 N).6. Test Specimen6.1 The thin test specimen shall have the shape and dimen-sions shown in the figure titled P/M Transverse RuptureStrength Test Specimen of Practices B 925.7. Procedure7.1 Prepare test specimens by pressing and sintering usingtooling shown in the figure titled

11、Transverse Rupture TestSpecimen, Typical Laboratory Tooling of Practices B 925,ormachine from finished parts. Measure the width and thicknessof the specimens to the nearest 0.001 in. (0.03 mm) with amicrometer.1This test method is under the jurisdiction of ASTM Committee B09 on MetalPowders and Meta

12、l Powder Products and is the direct responsibility of Subcom-mittee B09.05 on Structural Parts.Current edition approved Nov. 1, 2005. Published November 2005. Originallyapproved in 1970. Last previous edition approved in 1999 as B 528 99.2For referenced ASTM standards, visit the ASTM website, www.as

13、tm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO

14、Box C700, West Conshohocken, PA 19428-2959, United States.7.2 Locate the specimen in the transverse rupture test fixtureperpendicular to the supporting rods. Apply compressive forceparallel to the pressing direction of the specimen at a no-loadcrosshead speed of not greater than 0.2 in. (5.0 mm)/min

15、 untilrupture occurs. Record this breaking force to the nearest 10 lbf(50 N).8. Calculation8.1 Calculate the transverse rupture strength of the speci-men as follows:TRS 5 3 3 P 3 L! / 2 3 t23 w! (1)where:TRS = transverse rupture strength of the specimen, psi(MPa),P = force required to rupture the sp

16、ecimen, lbf (N),L = length of specimen span relative to fixture 1.000 in.(25.4 mm),w = width of the specimen, in. (mm), andt = thickness of specimen, in. (mm).9. Report9.1 Report the transverse rupture strength in pounds-forceper square inch (megapascals) to the nearest 1000 psi (10MPa). When report

17、ing the results, state the following supple-mentary data to clarify the results:9.1.1 Identification of the material being tested, that is,composition, density, state of heat treatment, and compacted ormachined specimen.10. Precision10.1 On the basis of test error alone, the difference in theabsolut

18、e value of two test results, x1and x2. obtained in thesame laboratory on the same material, will be expected toexceed r, (the repeatability interval) only about 5 % of thetime. If such a difference is found to be larger than r there isreason to question one or both results. The value of r variesprop

19、ortionally with the magnitude of the transverse rupturestrength and is calculated from the following equation:r 5 6700 1 0.064! x 41000! (2)NOTEThis fixture is used in Test Method B 312.FIG. 1 Transverse Rupture Test FixtureB528052where the units of r and x are psi. This applies over the rangefrom x

20、 from 41 500 to 145 000 psi. The unit x is the averageof the two points being checked.x11 x225 x (3)10.2 On the basis of test error alone, the difference inabsolute value of two test results, x1and x2, obtained indifferent laboratories on the same material, will be expected toexceed R, the reproduci

21、bility interval, only about 5 % of thetime. If such a difference is found to be larger than R there isreason to question one or both results. The value of R variesproportionally with the magnitude of the transverse rupturestrength and is calculated from the following equation:R 5 8900 1 0.122 ! x 41

22、000! (4)where units of R and x are psi.10.3 The value of r and R are assumed to vary linearly overthe transverse rupture strength range from 41 500 to 145 000psi. Transverse rupture strength was measured only at the twoend points.11. Keywords11.1 flexural strength; 3 Point Bend Test; transverse rupt

23、ure;transverse rupture strength; TRSSUMMARY OF CHANGESCommittee B09 has identified the location of selected changes to this standard since the last issue, B 528 99,that may impact the use of this standard. (Approved Nov. 1, 2005.)(1) Added Summary of Changes.(2) Added Practices B 925 to Referenced D

24、ocuments.(3) Deleted 5.1, 5.2, and 5.3 and renumbered subsequentsections.(4)In6.1, added reference to figure in Practices B 925 forspecimen shape.(5)In7.1, added reference to figure in Practices B 925 fortools to press a test specimen.(6) Deleted old Fig. 1 for tooling to press the compact andreplac

25、ed it with reference to Practices B 925.(7) Renumbered old Fig. 2 as Fig. 1 and changed the dimen-sions on the test fixture to conform with modern drawingpractices.(8) Deleted old Fig. 3 which shows the shape and dimensionsof the test specimen, and replaced it with a reference to thespecimen shape i

26、n Practices B 925.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement o

27、f such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for

28、additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known t

29、o the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).B528053