ASTM C368-1988(2011) Standard Test Method for Impact Resistance of Ceramic Tableware《陶瓷餐具抗冲击性的标准试验方法》.pdf
《ASTM C368-1988(2011) Standard Test Method for Impact Resistance of Ceramic Tableware《陶瓷餐具抗冲击性的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM C368-1988(2011) Standard Test Method for Impact Resistance of Ceramic Tableware《陶瓷餐具抗冲击性的标准试验方法》.pdf(4页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: C368 88 (Reapproved 2011)Standard Test Method forImpact Resistance of Ceramic Tableware1This standard is issued under the fixed designation C368; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revisio
2、n. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers the following tests:1.1.1 Impact tests at the center of both flatware and hollowware and at the rim of hol
3、low ware, and1.1.2 Chipping tests at the rim of flatware. Specimens maybe either glazed or unglazed.NOTE 1The impact test at the center of the specimen is used todetermine: (1) the magnitude of a blow that will produce initial fracture,and (2) the amount of energy necessary to produce complete failu
4、re. In thefirst case, the initial fracture shows on the side of the piece opposite fromthat being struck and appears to be a function of the square of thethickness and of the inherent brittleness of the body or body-glazecombination; it is relatively independent of the size or design of thespecimen.
5、 The second factor is more dependent upon design and often issubject to wide variation within a given group of pieces.NOTE 2The impact test at the rim of hollow ware is similar to achipping test, and the type of failure that is obtained is useful in evaluatingthe effect of the shape of the object.NO
6、TE 3In addition to the inherent strength of the body, chipping testresults are greatly affected by contour of rim and to a lesser extent bythickness of rim, inclination of leaf, and fit of glaze.1.2 The values stated in inch-pound units are to be regardedas the standard. The SI (metric) units given
7、in parentheses arefor information purposes only.1.3 This standard does not purport to address all of thesafety 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 reg
8、ulatory limitations prior to use.2. Referenced Documents2.1 ASTM Adjuncts:2ADJC0368 Machine for Testing Chinaware3. Significance and Use3.1 The purpose of this test method is to predict productresistance to impact breakage in service.4. Apparatus4.1 Impact Tester, Pendulum TypeThe impact test appa-r
9、atus (Figs. 1 and 2)2shall consist of a device having thefollowing essential features:4.1.1 A steel tup of specified size and of hardness RockwellC55,4.1.2 Support of a tup by a V-suspension,4.1.3 Provision for a means of release from fixed heights soas to give reproducible results, independent of t
10、he operator, and4.1.4 Provision for holding the test specimen in place byspring clamps against rigid metal supports.4.2 MicrometerFor measuring thickness of test speci-mens, a micrometer caliper that can be read to 0.001 in. (0.03mm) shall be used.5. Test Specimens5.1 Specimens shall be selected so
11、as to be representative ofthe lot being sampled. In general, impact tests shall be based ona minimum of ten specimens and chipping tests on at least fivespecimens. Specimens shall be inspected for soundness andobvious physical defects before testing.6. Procedure for Impact Testing of Flatware6.1 Mou
12、nt the cylindrical tube shown in Fig. 2 (Note 4)onthe backstop, C, Fig. 1, and set at a height such that the threeball bearings mounted in the end of the cylindrical tube are incontact and symmetrical with the central portion of thespecimen, which shall be stood on edge on the base plate. Thespecime
13、n may be tested with either the face or the back towardthe hammer; in general, a lower failure value is obtained whenthe face is struck. Adjust the backstop so that the sphericalsurface of the tup, D, just touches the surface of the specimenwhen the tup is hanging free (vertically). Tighten the two
14、wingnuts at the base of the backstop.NOTE 4In this portion of the test, the cylindrical tube replaces theangle clamp, E, shown in position on the backstop, C,inFig. 1.1This test method is under the jurisdiction ofASTM Committee C21 on CeramicWhitewares and Related Products and is the direct responsi
15、bility of SubcommitteeC21.03 on Methods for Whitewares and Environmental Concerns.Current edition approved March 1, 2011. Published March 2011. Originallyapproved in 1955. Last previous edition approved in 2006 as C368 88(2006). DOI:10.1520/C0368-88R11.2Detailed working drawings of the apparatus are
16、 available from ASTMHeadquarters. Request Adjunct No. ADJC0368.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.6.2 Adjust the positioning arms, F, held in retracted positionby means of their cotter keys so that the forward edges of t
17、hesleeve and of the clamp coincide. Adjust the clamps on thevertical posts to grip the specimen at the same height that thependulum will strike it; that is, halfway up. Adjust the arms sothat the rubber-covered surface at right angles to its rod willcontact the rim of the sample; remove the cotter k
18、eys to permitthe positioning arms to hold the specimen against the cylindri-cal tube. Adjust the pendulum support bar, B, and lock it inposition by means of the handwheels, A, so that the tup strikesthe center of the specimen.FIG. 1 Impact Test ApparatusFIG. 2 Tube to Support Flatware SpecimenC368 8
19、8 (2011)26.3 With the preliminary adjustments completed, subject thespecimen to a schedule of impacts starting at 0.02 ftlbf (0.027J) and increasing in increments of 0.01 ftlbf (0.014 J) untilinitial fracture, and in increments of 0.02 ftlbf thereafter tofailure.NOTE 5The tests may be performed rapi
- 1.请仔细阅读文档,确保文档完整性,对于不预览、不比对内容而直接下载带来的问题本站不予受理。
- 2.下载的文档,不会出现我们的网址水印。
- 3、该文档所得收入(下载+内容+预览)归上传者、原创作者;如果您是本文档原作者,请点此认领!既往收益都归您。
下载文档到电脑,查找使用更方便
10000 积分 0人已下载
下载 | 加入VIP,交流精品资源 |
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- ASTMC36819882011STANDARDTESTMETHODFORIMPACTRESISTANCEOFCERAMICTABLEWARE 陶瓷餐具 冲击 标准 试验 方法 PDF

链接地址:http://www.mydoc123.com/p-466392.html