ASTM F484-2002 Standard Test Method for Stress Crazing of Acrylic Plastics in Contact with Liquid or Semi-Liquid Compounds《接触液体或半液体化合物时丙烯酸塑料应力银纹的标准试验方法》.pdf
《ASTM F484-2002 Standard Test Method for Stress Crazing of Acrylic Plastics in Contact with Liquid or Semi-Liquid Compounds《接触液体或半液体化合物时丙烯酸塑料应力银纹的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM F484-2002 Standard Test Method for Stress Crazing of Acrylic Plastics in Contact with Liquid or Semi-Liquid Compounds《接触液体或半液体化合物时丙烯酸塑料应力银纹的标准试验方法》.pdf(3页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: F 484 02Standard Test Method forStress Crazing of Acrylic Plastics in Contact with Liquid orSemi-Liquid Compounds1This standard is issued under the fixed designation F 484; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revisio
2、n, 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.This standard has been approved for use by agencies of the Department of Defense.1. Scope1.1 This test method cove
3、rs determination of the crazingeffect that a liquid or semi-liquid test compound will have ontransparent acrylic plastic material that is under bending stress.1.2 Three types of acrylic material are covered. One, two, orall of the materials shall be used in the test, as specified by theprocuring age
4、ncy. When not specified otherwise, all three typesof acrylic shall be used in the test.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
5、and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:D 1193 Specification for Reagent Water22.2 Military Standards:MIL-PRF-5425 Plastic Sheet, Acrylic, Heat Resistant3MIL-PRF-8184 Plastic Sheet, Acrylic, Modified3MIL-P-25690 Plastic, Sheet
6、s and Formed Parts, ModifiedAcrylic-Basic, Monolithic, Crack Propagation Resistant33. Terminology3.1 Definitions:3.1.1 crazea minute surface crack, sometimes hairline insize.NOTE 1Hairline craze cracks are very difficult to see except withcareful inspection under properly oriented light.3.1.2 cracka
7、 fracture or tear.4. Types4.1 Type A, cast acrylic material shall conform to MIL-PRF-5425, Finish A.4.2 Type B, cast acrylic material shall conform to MIL-PRF-8184, Finish B.4.3 Type C, stretched acrylic material shall conform toMIL-P-25690.5. Apparatus5.1 Stress ApparatusThe means of stressing the
8、acrylicplastic test specimen bars shall be as shown in Fig. 1.6. Test Specimens6.1 The test specimens shall be machined from 0.25 60.025 in. (6.4 6 0.64 mm) thick polished acrylic plastic sheetconforming to the applicable specification.6.2 The test specimens shall be 1 6 0.03 in. (25.4 6 0.8mm) wide
9、 by 7 6 0.05 in. (177.8 6 1.27 mm) long by 0.25 60.025 in. (6.4 6 0.64 mm) thick. Edges shall be a smoothmachined surface without cracks.7. Conditioning7.1 Do not anneal Type C acrylic specimens.7.2 Anneal Type A and Type B acrylic test specimens aftermachining by heating in a circulating air oven a
10、t 195 6 5F (916 3C) for 512 h. Cool the specimens to room temperature inthe oven using a uniform cooling rate of 50F (28C)/h.7.3 Condition all specimens at 75 6 10F and 50 6 5%relative humidity for a minimum of 24 h just before testing.8. Procedure8.1 Test two specimens of each acrylic material spec
11、ified foreach of the test compounds being evaluated.8.2 Conduct the test at a temperature of 75 6 10F (23 65C).8.3 Carefully load the acrylic specimen as a cantilever beamas shown in Fig. 1. Unless otherwise specified, the followingare recommended stress levels:8.3.1 Type A specimens shall be stress
12、ed to an outer fiberstress of 3000 psi (20 685 kPa).8.3.2 Type B specimens shall be stressed to an outer fiberstress of 3500 psi (24 132 kPa).8.3.3 Type C specimens shall be stressed to an outer fiberstress of 4500 psi (31 027 kPa).8.4 Allow the specimen to remain under the designated1This test meth
13、od is under the jurisdiction of ASTM Committee F07 onAerospace and Aircraft and is the direct responsibility of Subcommittee F07.07 onQualification Testing of Aircraft Cleaning Materials.Current edition approved May 10, 2002. Published July 2002. Originallypublished as F 484 77. Last previous editio
14、n F 484 83 (1998)e1.2Annual Book of ASTM Standards, Vol 11.01.3Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700Robbins Ave., Philadelphia, PA 19111-5098, Attn: NPODS.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United
15、 States.stress for 10 min; then examine under the lighting and visualinspection conditions shown in Fig. 1 to be sure no crazing hasinitiated. If crazing has occurred, substitute another acrylic testspecimen.8.5 With the test specimen again under the designated load,place an absorbent cotton or flan
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