SAE J 948-2017 Test Method for Determining Resistance to Abrasion of Automotive Bodycloth Vinyl and Leather and the Snagging of Automotive Bodycloth.pdf

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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 there

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4、0 (outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report, please visit http:/standards.sae.org/J948_201706 SURFACE VEHICLE STANDARD J948 JUN2017 Issued 1966-06 Revised 2017-06 Superseding J9

5、48 MAY2011 Test Method for Determining Resistance to Abrasion of Automotive Bodycloth, Vinyl, and Leather, and the Snagging of Automotive Bodycloth RATIONALE 3.1.1 Removed reference to Model No. 5135. 3.2 Changed tolerance for relative humidity from 50% 5% to 50% 10%. 3.3.3 Changed “Dust” to “Lightl

6、y brush”; add “to remove any loose debris”. 3.3.6 Changed “at” to “to”. 4.1.1 Changed “remain” to “measure”; add “are outside of this range or”; change “36 grit” to “50 grit” (to match requirements of ASTM D4157); delete “for 400 cycles or” (this is not necessary with the statement until they confor

7、m to the shape of the drum); delete “and re-insert in the same holder and in the same position” (once the rubber pad is resurfaced, it should not be removed); add “remove or”. 4.1.3 Added “Acrylic Adhesive” to description of 3M 400. 4.2 Changed tolerance for relative humidity from 50% 5% to 50% 10%.

8、 4.3.1 and 4.3.1.1 Changed “double-backed” to “double-faced”. FOREWORD There are two different tests for wear in this procedure and they are not equivalent. The results from the two test methods (Taber (see Section 3) and Wyzenbeek (see Section 4) cannot be compared. SAE INTERNATIONAL J948 JUN2017 P

9、age 2 of 5 1. SCOPE These methods of test are applicable for determining the resistance to snagging and abrasion of automotive bodycloth, vinyl, and leather. 2. REFERENCES There are no referenced publications specified herein. 3. TABER METHOD 3.1 Materials and Equipment Required 3.1.1 Taber Abraser

10、complete with vacuum accessory or equivalent 3.1.2 H-18 wheels or equivalent (for Snagging Test) 3.1.3 CS-10 wheels or equivalent (for Abrasion Test) 3.1.4 Diamond Wheel Dresser 3.1.5 S-11 Abrasive Paper Refacing Disc or equivalent 3.1.6 S-12 Soft Bristle Brush or equivalent 3.2 Test Specimens Cut s

11、pecimens approximately 135 mm in diameter (or square). Test specimens are prepared by folding specimen once in each direction and then clipping the folded point to produce a small central hole approximately 6 mm to fit over the turntable clamping screw. Specimens are then conditioned at 23 C 2 C and

12、 50% 10% relative humidity for 24 hours. 3.3 Procedure 3.3.1 Mount the accessory masses marked 1000 g to each abraser arm. 3.3.2 Install the wheels on their respective flanged holders as indicated by the printing on the side of the wheel. The one marked right (left) side fits on the right-hand (left

13、-hand) mounting with printed side facing the center of the turntable. H-18 type wheels shall be used when testing snagging resistance and CS-10 type wheels shall be used when testing abrasion resistance. 3.3.3 The CS-10 wheels must be refaced before each test run to remove abraded materials from the

14、 wheels that collected from the prior test. Mount the S-11 abrasive paper refacing disc on the Taber Abraser turntable and fasten using the clamp plate and nut, and hold-down ring. Reface CS-10 abrasive wheels 25 cycles by running them against the S-11 type abrasive paper refacing disc. Lightly brus

15、h the refaced abrasive wheels with an S-12 soft bristle brush to remove any loose debris then remove the S-11 refacing disc. 3.3.4 If the H-18 wheels are worn out of round, crowned, or excessively clogged with abraded material, they should be dressed prior to testing using the diamond refacer until

16、the condition is corrected. In cases of doubt about the condition of the abrasive wheels, new wheels shall be used. 3.3.5 Place the test specimen on the turntable with the side to be tested facing up. Adjust the hold-down ring to a tight fit over the specimen and turntable and press the hold-down ri

17、ng over the circumference of the turntable to pull the test material taut. Remove any wrinkles in the test specimen by adjusting the fabric edges which extend below the hold-down ring. Then, tighten the adjusting screw of the hold-down ring. Place the clamp plate over the turntable screw and tighten

18、 the nut. Trim off the excess test specimen material which extends beyond the lower edge of the hold-down ring. SAE INTERNATIONAL J948 JUN2017 Page 3 of 5 3.3.6 Lower the abrasive wheels carefully from their upright position to the surface of the test specimen. Set the counter mechanism to zero. 3.3

19、.7 Position the vacuum nozzle 3 mm above the surface of the test specimen and set the vacuum in the range of 60 to 70. 3.3.8 Run the specimen the number of cycles specified. 400 cycles shall be run for snagging, unless otherwise specified. 1000 cycles shall be run for abrasion of bodycloth, unless o

20、therwise specified. 3.3.9 Remove specimen for evaluation. 4. WYZENBEEK METHOD The Wyzenbeek method can be used to determine the resistance to abrasion of automotive vinyl and leather. 4.1 Apparatus and Material Required 4.1.1 Wyzenbeek Wear Tester or Equivalent The hardness of the rubber pads should

21、 measure between 55 to 75 when tested with a type “00“ durometer on the flat surfaces. Rubber pads which are outside of this range or do not fit snugly in their respective holders should be replaced. Due to misalignment or wear during use, the following procedure should be performed when necessary;

22、after cleaning the drum surface with a solvent, insert a piece of 50 grit sandpaper and clamp into position. Lower the arms removing all applied pressure and abrade the rubber pad in 50 cycle increments until they conform to the shape of the drum. Clean the resurfaced rubber pad with a stiff brush.

23、Once a rubber pad has been put through this procedure do not remove or use in any other holder without resurfacing. 4.1.2 100% Cotton Warp Sateen Fabric; Count 104 X 55, 214 g/m2 Abradant, or as otherwise specified 4.1.3 Double-Faced Tape, 3M Acrylic Adhesive 400 or equivalent 4.1.4 Masking Tape, 76

24、 mm Wide 4.2 Test Specimens Test specimens 63.5 mm x 230 mm are prepared to template (see Figure 1) size in both warp and fill directions. The long dimensions are cut parallel to the warp yarns for warp-wise (machine direction) abrasion and parallel to the filling yarns for filling-wise (cross machi

25、ne direction) abrasion. Condition the test specimens for a minimum of 16 hours at 23 C 2 C and 50% 10% relative humidity. All materials other than rigid, nonstretch materials, shall have the back of the test specimen completely covered with 76 mm masking tape. 4.3 Procedure 4.3.1 Cut the abradent 24

26、1 (warp) x 305 (fill) mm and apply one length of double-faced tape in the middle, on the back side of the abradent, parallel to the fill direction. The long floats are on the face side of the abradent. 4.3.1.1 Strip the covered side of the double-faced tape and clamp the fabric on the drum in such a

27、 manner that the warp direction is parallel to motion of the drum. When pressing down on the taped portion of the fabric, make sure there is good and uniform adhesion between the drum, the tape, and the fabric. Also, this taped area must be completely free from wrinkles. 4.3.2 Place the specimen in

28、the clamps with the long dimension parallel to the direction of abrasion. SAE INTERNATIONAL J948 JUN2017 Page 4 of 5 4.3.3 Draw the specimen tight enough to bring the weighted tension scale bar into a horizontal position using a 1.8 kg dead weight load. NOTE: If the specimen stretches during the tes

29、t, bring the scale bar back into a horizontal position by adjusting the screw behind the rear clamp. 4.3.4 Set the weight on the pressure bar at 1.35 kg. 4.3.5 Set the counter to zero. 4.3.6 Abrade the specimen for the required number of cycles. 4.3.7 Remove the specimen from the wear tester for eva

30、luation. 4.3.8 Change the abradent for each set of specimens. Figure 1 - Test specimen SAE INTERNATIONAL J948 JUN2017 Page 5 of 5 5. NOTES 5.1 Revision Indicator A change bar (I) located in the left margin is for the convenience of the user in locating areas where technical revisions, not editorial

31、changes, have been made to the previous issue of this document. An (R) symbol to the left of the document title indicates a complete revision of the document, including technical revisions. Change bars and (R) are not used in original publications, nor in documents that contain editorial changes only. PREPARED BY THE SAE TEXTILES AND FLEXIBLE PLASTICS COMMITTEE