ASTM C1331-2018 Standard Practice for Measuring Ultrasonic Velocity in Advanced Ceramics with Broadband Pulse-Echo Cross-Correlation Method《用宽带脉冲回波互相关法测量高级陶瓷中超声波速度的标准实施规程》.pdf
《ASTM C1331-2018 Standard Practice for Measuring Ultrasonic Velocity in Advanced Ceramics with Broadband Pulse-Echo Cross-Correlation Method《用宽带脉冲回波互相关法测量高级陶瓷中超声波速度的标准实施规程》.pdf》由会员分享,可在线阅读,更多相关《ASTM C1331-2018 Standard Practice for Measuring Ultrasonic Velocity in Advanced Ceramics with Broadband Pulse-Echo Cross-Correlation Method《用宽带脉冲回波互相关法测量高级陶瓷中超声波速度的标准实施规程》.pdf(9页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: C1331 01 (Reapproved 2012)C1331 18Standard Test Method Practice forMeasuring Ultrasonic Velocity in Advanced Ceramics withBroadband Pulse-Echo Cross-Correlation Method1This standard is issued under the fixed designation C1331; the number immediately following the designation indicates t
2、he year oforiginal adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope Scope*1.1 This test method practice describes a proc
3、edure for measurement of ultrasonic velocity in structural engineering solids suchas monolithic ceramics, toughened ceramics, and ceramic matrix composites.1.2 This test method practice is based on the broadband pulse-echo contact ultrasonic method. The procedure involves acomputer-implemented, freq
4、uency-domain method for precise measurement of time delays between pairs of echoes returned bythe back surface of a test sample or part.1.3 This test method practice describes a procedure for using a digital cross-correlation algorithm for velocity measurement.Thecross-correlation function yields a
5、time delay between any two echo waveforms (1).21.4 This international standard was developed in accordance with internationally recognized principles on standardizationestablished in the Decision on Principles for the Development of International Standards, Guides and Recommendations issuedby the Wo
6、rld Trade Organization Technical Barriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:3B311 Test Method for Density of Powder Metallurgy (PM) Materials Containing Less Than Two Percent PorosityC373 Test Methods for Determination of Water Absorption and Associated Properties by
7、 Vacuum Method for Pressed CeramicTiles and Glass Tiles and Boil Method for Extruded Ceramic Tiles and Non-tile Fired Ceramic Whiteware ProductsE494 Practice for Measuring Ultrasonic Velocity in MaterialsE543 Specification for Agencies Performing Nondestructive TestingE1316 Terminology for Nondestru
8、ctive Examinations2.2 ASNT Document:Documents:4Recommended Practice SNT-TC-1A for Nondestructive Testing Personnel Qualification and CertificationANSI/ASNT CP-189 Standard for Qualification and Certification of Nondestructive Testing Personnel2.3 Military Standard:ISO Document:MIL-STD-410ISO 9712 No
9、ndestructive Testing Personnel Qualification Non-destrtuctive Testing Qualification and Certifi-cation of NDT Personnel52.4 Aerospace Industries Association Document:NAS 410 Certification and Qualification of Nondestructive Testing Personnel62.5 Additional references are cited in the text and at end
10、 of this document.1 This test method practice is under the jurisdiction of ASTM Committee E07 on Nondestructive Testing and is the direct responsibility of Subcommittee E07.06 onUltrasonic Method.Current edition approved Aug. 1, 2012Feb. 1, 2018. Published November 2012February 2018. Originally appr
11、oved in 1996. Last previous edition approved in 20072012as C1331 01 (2007).(2012). DOI: 10.1520/C1331-01R12.10.1520/C1331-18.2 The boldface numbers in parentheses refer to the list of references at the end of this test method.practice.3 For referencedASTM standards, visit theASTM website, www.astm.o
12、rg, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.4 Available from American Society for Nondestructive Testing (ASNT), P.O. Box 28518, 1711 Arlingate Ln., Columbus, OH 43228-05
13、18, http:/www.asnt.org.5 Available from Standardization Documents Order Desk, DODSSP, Bldg. 4, Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http:/www.dodssp.daps.mil.International Organization for Standardization (ISO), ISO Central Secretariat, BIBC II, Chemin de Blandonnet 8, CP 401, 1
14、214 Vernier, Geneva,Switzerland, http:/www.iso.org.6 Available from Aerospace Industries Association of America, Inc., 1250 Eye St. NW, Washington, DC, 2005.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made
15、 to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.*A Su
16、mmary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States13. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 back surfacethe surface of a test sample which is oppos
17、ite to the front surface and from which back surface echoes arereturned at normal incidence directly to the transducer.3.1.2 bandwidththe frequency range of an ultrasonic probe, defined by convention as the difference between the lower andupper frequencies at which the signal amplitude is 6 dB down
18、from the frequency at which maximum signal amplitude occurs.3.1.3 broadband transduceran ultrasonic transducer capable of sending and receiving undistorted signals over a broadbandwidth, consisting of a thin damped piezocrystal in a buffered probe (search unit).3.1.4 buffered probean ultrasonic sear
19、ch unit as defined in Terminology E1316 but containing a delay line, or buffer rod, towhich the piezocrystal is affixed within the search unit housing and which separates the piezocrystal from the test sample (Fig. 1).3.1.5 buffer rodan integral part of a buffered probe, usually a quartz or fused si
20、lica cylinder that provides a time delay betweenthe excitation pulse from the piezocrystal and echoes returning from a sample coupled to the free end of the buffer rod.3.1.6 cross-correlation functionthe cross-correlation function, implemented by a digital algorithm, yields a time delaybetween any t
21、wo (ultrasonic) echo waveforms. This time is used to determine velocity (1).3.1.7 dispersionvariation of ultrasonic velocity as a function of wavelength, that is, frequency dependence of velocity.3.1.8 front surfacethe surface of a test sample to which the buffer rod is coupled at normal incidence (
22、designated as testsurface in Terminology E1316.3.1.9 group velocityvelocity of a broadband ultrasonic pulse consisting of many different component wavelengths.3.1.10 test samplea solid coupon or material part that meets the constraints needed to make the ultrasonic velocitymeasurements described her
23、ein, that is, a test sample or part having flat, parallel, smooth, preferably ground or polished opposing(front and back) surfaces, and having no discrete flaws or anomalies unrepresentative of the inherent properties of the material.3.1.11 wavelength ()distance that sound (of a particular frequency
24、) travels during one period (during one oscillation), = v/f,where v is the velocity of sound in the material and where velocity is measured in cm/s, frequency in MHz, and wavelength incm, herein.3.2 Other terms or nomenclature used in this test method practice are defined in Terminology E1316.4. Sig
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