ASTM D4475-2002 Standard Test Method for Apparent Horizontal Shear Strength of Pultruded Reinforced Plastic Rods By The Short-Beam Method《用短梁法测定挤拉制增强塑料棒表观水平剪切强度的标准试验方法》.pdf
《ASTM D4475-2002 Standard Test Method for Apparent Horizontal Shear Strength of Pultruded Reinforced Plastic Rods By The Short-Beam Method《用短梁法测定挤拉制增强塑料棒表观水平剪切强度的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM D4475-2002 Standard Test Method for Apparent Horizontal Shear Strength of Pultruded Reinforced Plastic Rods By The Short-Beam Method《用短梁法测定挤拉制增强塑料棒表观水平剪切强度的标准试验方法》.pdf(4页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D 4475 02Standard Test Method forApparent Horizontal Shear Strength of Pultruded ReinforcedPlastic Rods By the Short-Beam Method1This standard is issued under the fixed designation D 4475; the number immediately following the designation indicates the year oforiginal adoption or, in the
2、 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. Scope *1.1 This test method covers the determination of the appar-ent horizontal shear strength
3、 of fiber reinforced plastic rods.The specimen is a short beam in the form of lengths ofpultruded rods. This test method is applicable to all types ofparallel-fiber-reinforced plastic rod samples.1.2 This test method is primarily used for quality controland specification purposes (see 4.1).1.3 The v
4、alues stated in SI units are to be regarded as thestandard.1.4 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-bi
5、lity of regulatory limitations prior to use.NOTE 1There is no similar or equivalent ISO standard.2. Referenced Documents2.1 ASTM Standards:D 618 Practice for Conditioning Plastics for Testing2E 4 Practices for Force Verification of Testing Machines3E 691 Practice for Conducting an Interlaboratory St
6、udy toDetermine the Precision of a Test Method43. Summary of Test Method3.1 The horizontal-shear test specimen is center-loaded asshown in Fig. 1. The ends of the specimens rest on twosupports that allow the specimen to bend, the load beingapplied by means of a loading nose at midpoint along thesupp
7、ort span, as shown in Fig. 2.3.2 The specimen is deflected until a shear failure occurs atthe midplane of the horizontally supported rod.4. Significance and Use4.1 Apparent shear strength determined by this test methodis useful for quality control and specification purposes. It isalso applicable to
8、research and development programs con-cerned with interlaminar-shear strength. The apparent shearstrength obtained by this test method cannot be used for designpurposes, but can be utilized for comparative testing ofcomposite materials, if all failures are in horizontal shear.4.2 It is recommended t
9、hat control samples be fabricatedwith each research test series and that care be used to compareeach set of controls with corresponding test series run atdifferent times.5. Apparatus5.1 Testing MachineA properly calibrated testing ma-chine that can be operated at a constant rate of crossheadmotion,
10、and in which the error in the load measuring system1This test method is under the jurisdiction of ASTM Committee D20 on Plasticsand is the direct responsibility of Subcommittee D20.18 on Reinforced Thermoset-ting Plastics.Current edition approved March 10, 2002. Published May 2002. Originallypublish
11、ed as D 4475 85. Last previous edition D 4475 96.2Annual Book of ASTM Standards, Vol 08.01.3Annual Book of ASTM Standards, Vol 03.01.4Annual Book of ASTM Standards, Vol 14.02.FIG. 1 Test Assembly1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr
12、 Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.shall not exceed 61 % of the maximum load expected to bemeasured. The load-indicating mechanism shall be essentiallyfree of inertia lag at the crosshead rate used. The accuracy ofthe testing machine shall be verified in acco
13、rdance withPractices E 4.5.2 Loading Nose and SupportsShown in Fig. 2 and Fig.3. The loading nose shall be a suitable steel rod with a groovein the diameter of the pultruded rod machined in its lower end.The groove diameter shall always have a plus tolerance andzero negative tolerance. The bottom su
14、pport shall be adjustableto allow for testing at various span/diameter ratios. The surfaceof the groove shall be free of indentation and burrs, with allsharp edges relieved.5.3 MicrometersSuitable micrometers for measuring thediameter of the test specimen to an incremental discriminationof at least
15、0.025 mm (0.001 in.) shall be used.6. Test Specimen6.1 The specimen shall be cut from the pultruded rod to alength of one diameter greater than the test span and to atolerance of plus or minus 0.1 times the diameter.6.2 Number of SpecimensThe number of test specimens isoptional. However, a minimum o
16、f five specimens is required toobtain a satisfactory average and standard deviation.7. Conditioning7.1 ConditioningCondition the test specimens at 23 62C (73.4 6 3.6F) and 50 6 5 % relative humidity for not lessthan 40 h prior to test, in accordance with Procedure A ofPractice D 618 for those tests
17、where conditioning is required.In cases of disagreement, the tolerances shall be 61C(61.8F) and 62 % relative humidity. These conditions arerecommended for research and development trials, but notnecessarily for quality control. However, temperature controlto 22.2 6 5.6C (72 6 10F) is recommended fo
18、r qualitycontrol.7.2 Test ConditionsConduct tests in the standard labora-tory atmosphere of 23 6 2C (73.4 6 3.6F) and 50 6 5%relative humidity, unless otherwise specified in the test meth-ods. In cases of disagreement, the tolerances shall be 61C(61.8F) and 62 % relative humidity.7.3 Preconditioning
19、 in other environments to simulatespecified conditions and durations is permissible.7.4 Testing in other environmental conditions is permis-sible.8. Speed of Testing8.1 Test the specimen at a rate of crosshead motion of 1.3mm (0.05 in.)/min.NOTE 2The test time should be recorded, and, if the test ta
20、kes lessthan 20 s, the rate of crosshead motion should be decreased. If the testtakes over 200 s, the crosshead rate should be increased gradually, or insteps, until the time to complete the test is less than 200 s.9. Procedure9.1 Before conditioning or testing, measure the diameter ofeach specimen
21、to the nearest 0.025 mm (0.001 in.) at midpoint.9.2 Place the rod test specimen in the test fixture, as shownin Fig. 1. Align the specimen so that its midpoint is centeredand its long axis is perpendicular to the loading nose. Adjustthe side supports to the span previously determined. Suggestedspan-
22、to-diameter ratios are from 3 to 1 up to 6 to 1. Theobtainment of shear fractures during the test is a majorconsideration in determining span length.NOTE 3Experimental data indicates that shear strength is a functionof support span-to-specimen diameter ratio in most materials. Whenwriting specificat
23、ions, both the specimen diameter and the span-to-diameter ratio should be specified.9.3 Apply the load to the specimen at the specified cross-head rate. Record the load to break for each specimen(maximum load on load-indicating mechanism). At times,when testing pultruded rods in various environments
24、, speci-mens do not consistently fail in shear, especially when theincorrect span-to-depth ratio is chosen. It is, therefore, veryimportant to record the type of break (shear or tensile) thatoccurs. For research purposes, it is also useful to record theposition of the shear plane relative to the spe
- 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:
- ASTMD44752002STANDARDTESTMETHODFORAPPARENTHORIZONTALSHEARSTRENGTHOFPULTRUDEDREINFORCEDPLASTICRODSBYTHESHORTBEAMMETHOD

链接地址:http://www.mydoc123.com/p-517158.html