FORD FLTM BN 057-01-2017 DETERMINATION OF COEFFICIENT OF FRICTION OF FLOOR MAT BACKINGS.pdf

1、 FORD LABORATORY TEST METHOD BN 057-01 Date Action Revisions Rev. 0 2017 10 27 Released L. Sinclair, NA Controlled document at www.MATS Copyright 2017, Ford Global Technologies, LLC Page 1 of 12 DETERMINATION OF COEFFICIENT OF FRICTION OF FLOOR MAT BACKINGS Application This procedure is used to dete

2、rmine the coefficient of friction of carpeted throw-in mat assemblies and all-weather throw-in floor mats. The coefficient is determined in two directions, and can be determined against nonwoven and/or tufted floor carpets. Apparatus and Materials Required See Appendix A for images of appropriate ap

3、paratus components. Tensile Testing Machine Instron or equivalent, capable of actuating at a constant rate of 50 mm/min Load Cell 100 N only. Larger load cells will overload fixture. Weight (Figure A6) 3.4 +/- 0.1 kg (7.4 +/- 0.2 lb) Aluminum Sled (Figure A6) 100 mm x 100 mm Weight: 1000 +/- 15 g St

4、ainless Steel Leader Wires, 30 lb Rated (Figure A7) Wire #1: 610 +/- 10 mm (24 in) Wire #2: 305 +/- 10 mm (12 in), looped and crimped as shown in Figure A7. Aluminum Platform (Figure A6) 380 mm x 150 mm (15 in x 6 in) Pulley (Figure A6) 50 mm diameter Small S hooks (Figure A6, A7) Quantity: 3 Clamps

5、 Four to six clamps to clamp floor carpet sample to aluminum platform Floor Carpet, Nonwoven and Tufted Dimensions: 190 mm x 152 mm (7.5 in x 6 in) Number of samples is determined using Appendix B Tufted Carpet: WSS-M3H151 series any supplier Nonwoven Carpet: WRS-M3H159 series any supplier Floor Mat

6、 Specimen Dimensions: 100 mm x 100 mm (4 in x 4 in) Number of samples is determined using Appendix B FORD LABORATORY TEST METHOD BN 057-01 Copyright 2017, Ford Global Technologies, LLC Page 2 of 12 Analytical Balance Accuracy 0.01 g Conveyor Brush Segment (Figure A6) Segment of brush used for random

7、 velour brush conveyors. May be purchased from: JR Nonwoven 4356 Triple Crown Dr SW Concord, NC 28027 (704) 721-4093 Or equivalent. Chemicals, materials, parts, and equipment referenced in this document must be used and handled properly. Each party is responsible for determining proper use and handl

8、ing in its facilities. Sample Preparation 1. Determine the number of floor carpet and floor mat specimens needed using Appendix B. 2. Determine the nap direction of the floor carpet. Brush carpet by hand in each of four directions. The direction which exhibits resistance is against nap direction. Th

9、e direction 180 from this is with nap direction. 3. Cut 190 mm x 152 mm (7.5 in x 6 in) floor carpet samples such that the nap direction is parallel to the long edge of the carpet. Cut the number required per Appendix B. 4. Cut 100 mm x 100 mm (4 in x 4 in) square floor mat samples as required in Ap

10、pendix B. Identify the fore-aft direction of the floor mat using an arrow. The fore-aft direction is the direction the mat is oriented with respect to the front and rear of the vehicle (see Figure 1). If the fore-aft direction is not known, identify the nap direction using the same method as in Step

11、 2. Label the nap direction as machine direction and the perpendicular direction as cross-machine direction. If multiple floor mat samples are used, ensure that the direction is labeled consistently among all samples. 5. Punch two holes, approximately 3 mm in diameter, on one side of each floor mat

12、sample per Figure 2. The holes should be 25 mm (1 in) from the edge of the sample, as shown in Figure 2. The edge of the hole should be 3 +/- 1 mm from the edge of the floor mat to prevent tearing of the hole during testing. If only one floor mat sample is required per Appendix B, punch two holes on

13、 a perpendicular side as shown in Figure 2. If six floor mat samples are required per Appendix B, punch holes on only one side of 3 samples and punch holes on a perpendicular side of the other 3 samples, as shown in Appendix B. 6. Remove all excess fiber from the cut edges of the floor mat sample(s)

14、. 7. Weigh the floor mat samples to 0.01 g and record the result as wmat in grams. FORD LABORATORY TEST METHOD BN 057-01 Copyright 2017, Ford Global Technologies, LLC Page 3 of 12 Figure 1. Fore-Aft and Cross-Car directions identified on typical floor mat geometry. Figure 2. Hole locations for singl

15、e floor mat sample condition. Schematic diagram is not to scale. See Figure A7 for example floor mat. Procedure 1. Mount aluminum platform and pulley system to the tensile testing machine as shown in Figure A1. 2. Clamp a floor carpet sample to the aluminum platform, making sure that the floor mat w

16、ill be pulled against the nap direction of the floor carpet. See Sample Preparation Step 2 for nap determination procedure. Use as many clamps as necessary to ensure that the floor carpet is fixed flat against the platform. 3. Gently brush the floor carpet with the nap direction 10 times using the c

17、onveyor brush segment (See Figure A5). 4. Affix the 610 mm (24 in) wire leader to the load cell. Loop the other end of the wire leader under the pulley. 25 mm Direction Labeled Ex: Fore-Aft 25 mm 25 mm 25 mm 3 mm 3 mm 3 mm dia. Fore-Aft Machine Cross-Car Cross-Machine Front of Vehicle Rear of Vehicl

18、e 100 mm 100 mm FORD LABORATORY TEST METHOD BN 057-01 Copyright 2017, Ford Global Technologies, LLC Page 4 of 12 5. Attach the looped and crimped 305 mm (12 in.) wire leader assembly to the end of the 610 mm leader wire using an S hook. 6. Place 2 more S hooks through the two free ends of the 305 mm

19、 leader wire assembly. Place the other side of these S hooks through the two holes in one side of the floor mat sample. Ensure the S hooks in the floor mat specimen have the open ends upward, as shown in Figure A3, so hooks do not drag in the floor carpet. 7. Place the floor mat sample at the end of

20、 the floor carpet farthest from the load cell. Align floor mat sample edge parallel to floor carpet sample edge. Ensure that the wires are taut and parallel to the carpet surface but not touching the floor carpet (the pulley may need to be adjusted up or down to obtain parallel position). The appara

21、tus should now appear as shown in Figures A1 and A2. 8. Place the aluminum sled on the floor mat and then place the 3.4 kg weight on top of the sled (Figures A3 and A4). Leave the 3.4 kg weight on for 30 seconds and then remove, leaving the sled in place. 9. Set the crosshead speed to 50 mm/minute.

22、10. Using the tensile tester, pull the floor mat across the floor carpet for a distance of 40 mm. 11. Record the maximum load over the 40 mm extension. See Figures 3 through 6 for different possible load-extension graph behaviors, and the appropriate load to record for each. 12. Remove the sled and

23、the floor mat sample from the floor carpet. 13. If using nonwoven floor carpet, replace the floor carpet sample with a new piece. 14. Gently brush the carpet in the nap direction 10 times as in step 3. 15. Repeat steps 8 through 13 until a total of three runs have been completed in this direction. R

24、eplace the floor mat sample and/or the floor carpet sample each run if required by Appendix B. 16. Test the floor mat in the perpendicular direction (either by rotating the floor mat 90 degrees if only 1 floor mat sample is required, or by testing the remaining 3 samples with holes punched on the pe

25、rpendicular side). A new floor carpet sample shall be used for this direction, per Appendix B. FORD LABORATORY TEST METHOD BN 057-01 Copyright 2017, Ford Global Technologies, LLC Page 5 of 12 Figure 3. Selection of maximum load for definitive static peak behavior. Figure 4. Selection of maximum load

26、 for upward trending behavior. Definitive static peak: select highest point for max load. Upward trending behavior: select highest value even though graph does not have a definitive static peak. FORD LABORATORY TEST METHOD BN 057-01 Copyright 2017, Ford Global Technologies, LLC Page 6 of 12 Figure 5

27、. Selection of maximum load when upward trend resumes after static peak. Select the point which marks the start of downward trending behavior. This downward trending behavior indicates slip, or a static friction peak. Do not select the ultimate maximum if it occurs after downward trending segment. F

28、igure 6. Selection of maximum load when graph levels off with no definitive static peak. Select overall maximum load. Calculations select point which marks start of downward trend. Do not select this point Trending up Trending down indicates static peak has occurred Trending up Graph levels off; sel

29、ect overall maximum load over flat region. FORD LABORATORY TEST METHOD BN 057-01 Copyright 2017, Ford Global Technologies, LLC Page 7 of 12 Appendix A. Example Fixture Appendix B. Sampling Requirements Figure A1. Overall test setup before weight is placed on floor mat sample. 100 N Load Cell 610 mm

30、Stainless Steel Leader Wire 50 mm diameter pulley Aluminum platform Floor mat sample Floor Carpet 305 mm Stainless Steel Leader Wire Assembly Clamps FORD LABORATORY TEST METHOD BN 057-01 Copyright 2017, Ford Global Technologies, LLC Page 8 of 12 Figure A2. Example pulley mount system. Figure A3. Pla

31、cement of sled on floor mat sample. This is the appearance of the apparatus while the test is in progress. Sled placed to avoid the S hooks S hooks with open end facing up to avoid hooks dragging in floor carpet Floor mat sample Floor carpet sample clamped to aluminum platform FORD LABORATORY TEST M

32、ETHOD BN 057-01 Copyright 2017, Ford Global Technologies, LLC Page 9 of 12 Figure A4. Placement of 3.4 kg weight. Let weight dwell on sample for 30 seconds then remove the 3.4 kg weight prior to testing. Figure A5. Brushing floor carpet sample prior to testing. 3.4 kg weight placed on top of sled fo

33、r 30 seconds and then removed prior to start of test Brush floor carpet 10 times with the nap direction before each test. FORD LABORATORY TEST METHOD BN 057-01 Copyright 2017, Ford Global Technologies, LLC Page 10 of 12 Figure A6. Example fixture components. Aluminum platform Platform for moving pul

34、ley up and down Post for mounting platform to Instron 50 mm diameter pulley 3.4 kg weight 1000 g sled S hook looped into leader wire Hand Brush FORD LABORATORY TEST METHOD BN 057-01 Copyright 2017, Ford Global Technologies, LLC Page 11 of 12 Figure A7. Example fixture components, continued. 610 mm l

35、eader wire with fixture to attach to load cell 305 mm leader wire assembly Looped and crimped to attach S hook Two legs MUST be equal in length Floor mat with holes cut on two perpendicular sides Machine direction labeled on floor mat by arrow FORD LABORATORY TEST METHOD BN 057-01 Copyright 2017, Fo

36、rd Global Technologies, LLC Page 12 of 12 Appendix B. Sampling Requirements Floor carpets cut parallel to nap direction. Use new floor carpet sample when changing direction. Holes punched on perpendicular sides of floor mat sample. Holes punched on perpendicular sides of floor mat sample Floor carpe

37、ts cut parallel to nap direction. Use new floor carpet sample each run. Floor carpets cut parallel to nap direction. Use new floor carpet sample each run. 3 floor mat samples with holes punched on Side A with respect to machine direction 3 floor mat samples with holes punched on a Side B perpendicular from Side A All Floor Mat Backings