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1、SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefr
2、om, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. QUESTIONS REGARDING THIS DOCUMENT: (412) 772-8512 FAX: (412) 776-0243 TO PLACE A DOCU
3、MENT ORDER; (412) 776-4970 FAX: (412) 776-0790 Copyright 1997 Society of Automotive Engineers, Inc. All rights reserved.Printed in U.S.A. SURFACE VEHICLE 400 Commonwealth Drive, Warrendale, PA 15096-0001 STANDARD Submitted for recognition as an American National Standard J671 REV. MAY97 Issued1951-1
4、1 Revised1997-05 Superseding J671 APR82 (R) VIBRATION DAMPING MATERIALS AND UNDERBODY COATINGS 1.Scope 1.1Description of MaterialThe materials classified under this specification are: a.Mastic vibration damping materials used to reduce the sound emanating from metal panels. b.Mastic underbody coatin
5、gs used to give protection and some vibration damping to motor vehicle underbodies, fenders, and other parts. 1.2Numbering System 1.2.1PREFIXESThe prefix “D“ is used to indicate a cut back vibration damping material and the prefix “U“ is used to indicate a cut back underbody coating material. Should
6、 a water emulsion be desired, the prefix should be followed by the letter “E.“ Should a solvent-water emulsion be desired, the prefix should be followed by the letter “F.“ 1.2.2TYPESThe materials are further divided into types, based on the decay rate in decibels per second (dB/s) at 21 C, and class
7、es, based on the percentage of solids contained in the material. Types and classes are as follows in Tables 1A and 1B: TABLE 1ANOMINAL DECAY RATE, dB/s Type Nominal Decay Rate, dB/s 55 1010 1515 2020 2525 3030 SAE J671 Revised MAY97 -2- 1.3Example of the Use of NumbersA cut back underbody coating ha
8、ving a decay rate of 5 dB/s and a solids content of 65% would be designated by the number U-565. An emulsion body damping material of medium decay rate and maximum solids content would be numbered DE-1090. Any combination of type and class could be used to suit the needs of the application. 2.Refere
9、nces 2.1Applicable PublicationsThe following publications form a part of this specification to the extent specified herein. 2.1.1ASTM PUBLICATIONSAvailable from ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959. ASTM D 93Test Methods for Flash Point by Pensky-Martens Closed Tester ASTM D
10、 217Test Method for Cone Penetration of Lubricating Grease 3.Physical Properties 3.1Test SpecificationsFor testing procedures, see 4.1. 3.1.1VIBRATION DAMPING MATERIALThe material shall have a decay rate as shown in Table 2. TABLE 1BNOMINAL SOLIDS CONTENT, %(1) 1.This table will be expanded as addit
11、ional data is submitted and confirmed. Class Nominal Solids Content, % 6060 6565 7070 7575 8585 9090 TABLE 2MINIMUM DECAY RATE(1) 1. This table will be expanded as additional data is submitted and confirmed. Type Min Decay Rate, dB/s 21 C Min Decay Rate, dB/s 18 C Min Decay Rate, dB/s 38 C 5522 1010
12、44 151544 202055 2525 3030 SAE J671 Revised MAY97 -3- 3.1.2SOLIDSThe solids content of the material shall be as specified in Table 3. 3.1.3COLD ADHESIONThe average retention of material on three cold test panels shall be as shown in Table 4. 3.1.4FLASH POINTThe flash point of an underbody coating sh
13、all be at least 38 C; that of a vibration damping material shall be as agreed upon by the purchaser and the manufacturer. 3.1.5ABRASION RESISTANCE (WHEN SPECIFIED)The average retention on three abrasion test panels shall be not less than 95% of the material by weight. Each panel must retain at least
14、 90% of the material, and there shall be no exposed metal surfaces. 3.1.6SAGGINGThe material shall not sag more than 6 mm when tested on an inverted 45-degree panel. 3.1.7SPRAYABILITYFLOW RATEThe material shall have a flow rate as follows: a.Underbody Coatings45 s/l., max b.Vibration Damping Materia
15、l57 s/l., max 3.1.8SPRAYABILITYSTABILITYEmulsion materials shall not break under usual working pressures or conditions. 3.1.9SPRAYABILITYSPRAYBACK AND FOGGINGThe average of three sprayback and three fogging tapes shall contain no more sprayback and fogging than the standard tapes held by the consume
16、r. 3.1.10CONSISTENCY (PENETROMETER VISCOSITY)This shall be agreed between consumer and supplier. 3.1.11SETTINGThe material shall not settle nor separate within a reasonable period of transit and storage to such an extent as to cause difficulty in its use. For the purpose of this specification, the m
17、inimum time period shall be 30 days at room temperature. TABLE 3MINIMUM SOLIDS CONTENT BY WEIGHT (1) 1. This table will be expanded as additional data is submitted and confirmed. Class Min Solids Content, % by Weight 6060 6565 7070 7575 8583 9088 TABLE 4MINIMUM MATERIAL ON COLD-TEST PANEL Angle of S
18、lam, degree Min Material on Panel, % 7050 6080 50100 SAE J671 Revised MAY97 -4- 3.1.12TOXIC PROPERTIESThe material shall not contain dangerous amounts of toxic ingredients. NOTEAlthough this specification defines special properties necessary in a satisfactory product, it is not to be construed that
19、compliance with this specification relieves the vendor of the responsibility of supplying material commercially suitable for the use specified. 4.Physical PropertiesMethods of Test 4.1Decay Rate (Vibration Damping Materials)A 500 x 500 x 6 mm steel panel with a decay rate at room temperature of not
20、more than 3 dB/s and a natural frequency of 145 to 165 Hz shall be sprayed with a uniform coating of the material to the test weight of 2.34 to 2.54 kg/m2 dry weight. After air drying at room temperature for a minimum of 12 h, the panels containing vibration damping materials shall be baked 3 h at 1
21、35 C 3 C. Those containing underbody coatings shall be baked 24 h at 71 C 3 C. The decay rate shall be determined as follows: Support the panel at one or more nodal points for the fundamental natural frequency (the nodal pattern is a square connecting the midpoints of the edges of the panel). Excite
22、 vibration of the panel at its fundamental frequency and measure the rate of decay for free vibration. This rate of decay expressed in decibels per second is the decay rate. NOTEThe number of decibels corresponding to the ratio between any two vibration amplitudes is equal to 20 times the logarithm
23、to the base ten of that ratio. 4.2SolidsThe solid content shall be determined by placing 3 to 5 g of the material in a weighted container (anointment can, approximately 50 mm in diameter) and drying 3 h at 105 C 3 C, and reweighed after heating. 4.3Cold AdhesionThoroughly clean three 305 x 305 x 1 m
24、m cold-rolled steel test panels by immersing them in a solution of: a.30% by volume concentrated phosphoric acid b.30% by volume cellosolve c.40% by volume water and washing thoroughly with a clean rag. Remove the panel from the solution and wipe dry with another clean rag. These panels must have a
25、surface finish of not less than 0.89 nor more than 1.52 m and each panel may be used only once for cold adhesion testing. Proceed according to the following schedule: a.Coat a 230 x 230 mm area on each of three panels with a uniform coating to a test weight of 2.34 to 2.54 kg/m2 dry weight of materi
26、al. b.Air dry at room temperature for a minimum of 12 h. A shorter drying time may be considered if the actual application time interval is shorter. c.Bake 1.Vibration damping material3 h at 135 C 3 C. 2.Underbody coating24 h at 71 C 3 C. d.Cool to room temperature. e.Cool for 3 h at 23 C 1 C. f.Sla
27、m each panel in the cold adhesion test fixture, Figure 1, beginning at an angle of 10 degrees and increasing the angle of slam 10 degrees each successive slam until the 90 degree position is reached. The amount of material remaining on the panel is estimated between each slam. SAE J671 Revised MAY97
28、 -5- FIGURE 1SLAMMING FIXTURE 4.4Flash PointThe flash point shall be determined by the ASTM Pensky-Martens closed tester, ASTM D 93. 4.5Abrasion ResistanceClean three 305 x 125 x 1 mm cold-rolled steel panels as specified for the Cold Adhesion Test. Mask each panel to give an exposed area 100 x 305
29、mm and spray to the test weight of 2.34 to 2.54 kg/m2 dry weight of material. Air dry at room temperature 12 h minimum and bake 24 h 15 min at 71 C 3 C. Insert each panel in the abrasion tester, Figure 2, and subject to ten cycles of abrasion with 45.3 kg (a total of 453 kg) of No. 780 iron shot at
30、550 kPa air pressure. Allow the panel to cool to room temperature between cycles. The amount of material retained on each panel shall be determined by weighing. SAE J671 Revised MAY97 -6- FIGURE 2ABRASION TEST FIXTURE 4.6SaggingThoroughly clean two 305 x 305 x 1 mm cold-rolled steel test panels as s
31、pecified for the Cold Adhesion Test. Spray a 230 x 230 mm area on each panel with a uniform coating of the material to the test weight of 3.17 to 3.69 kg/m2 dry weight. The panels shall then be supported at an inverted 45-degree angle, air dried for 15 min, and baked for 30 min at 135 C 3 C. For und
32、ercoating materials, the test weight is to be 2.34 to 2.54 kg/m2 dry weight, and the baking requirements are not necessary. 4.7SprayabilityFlow RateThe flow rate of a body damping material shall be determined by placing the material in a 7.6 L bottom outlet pressure tank with 4.6 m of 19 mm ID fluid
33、 hose with a suitable deadener spray gun and 72.7 mm round nozzle. The flow rate shall be measured with 415 kPa pressure on the tank and no atomizing pressure at a temperature of 24 C 3 C. The flow rate of an underbody coating shall be determined in a like manner except that a 6 mm round nozzle shal
34、l be used. 4.8SprayabilitySprayback and FoggingThis is a comparative method for determining the sprayback and fogging characteristics of a material. The particles which are blown back during the spraying are caught on the adhesive side of transparent cellulose tapes. The tapes can be mounted on a sh
35、eet of white paper for observation. The tapes with the adhesive side facing the panel are designated as sprayback tapes, and those facing away from the panel are fogging tapes. A 305 x 305 mm test panel shall be mounted in the sprayback and fogging test booth as shown in Figure 3. With the spraygun
36、and test tapes located as shown, the panel shall be sprayed with approximately 0.23 kg of material. The tapes should then be removed and attached to white cards. 4.9ConsistencyFor inspection purposes, the consistency may be determined by ASTM D 217 penetration cone. SAE J671 Revised MAY97 -7- FIGURE
37、 3RELATIVE POSITIONS OF PANEL, SPRAYGUN, AND TAPES FOR SPRAYBACK AND FOGGING TESTSPLAIN VIEW 5.Notes 5.1Marginal IndiciaThe change bar (l) located in the left margin is for the convenience of the user in locating areas where technical revisions have been made to the previous issue of the report. An
38、(R) symbol to the left of the document title indicates a complete revision of the report. PREPARED BY THE SAE NONMETALLIC MATERIALS COMMITTEE SAE J671 Revised MAY97 RationaleNot applicable. Relationship of SAE Standard to ISO StandardNot applicable. ApplicationThe materials classified under this spe
39、cification are: a.Mastic vibration damping materials used to reduce the sound emanating from metal panels. b.Mastic underbody coatings used to give protection and some vibration damping to motor vehicle underbodies, fenders, and other parts. Reference Section ASTM D 93Test Methods for Flash Point by Pensky-Martens Closed Tester ASTM D 217Test Method for Cone Penetration of Lubricating Grease Developed by the SAE Nonmetallic Materials Committee
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