1、FORD LABORATORY TEST METHOD BN 017-01 Date 2001 O9 10 1992 07 08 DETERMINATION OF THE EFFECT OF FADEOMETER AGING ON TENSILE STRENGTH OF SEWING THREADS AND SEAT BELTS Action Revisions Revised Editorial - no technical change A. Cockman Application This method is used to determine the effect of ultra-v
2、iolet radiation on the tensile strength of sewing threads and seat belt webbings after Fadeometer exposure. Apparatus Required Fadeometer Refer to SAE J 1885. Tensile Testing Machine Constant rate of extension type, Model E Tensometer or equivalent. Source: Instron Corp. or Tensometer Ltd. 100 Royal
3、1 Street Croydon, Surrey Canton, MA 02021 England Clips Refer to Figure 1 Conditioning and Test Conditions All test values indicated herein are based on material conditioned in a controlled atmosphere of 23 +/- 2 OC and 50 +/- 5 % relative humidity for not less than 24 h prior to testing and tested
4、under the same conditions unless otherwise specified. Procedure Method A - Thread Samples 1. Expose the sewing threads in a Fadeometer, using the following method: (a) Prepare a frame 70 x 120 mm with an opening 50 x 50 mm made d either 2 - 3 mm thick sheet polyethylene or fiberboard. Copynght02001,
5、 Ford Global Technologies, Inc FORD LABORATORY TEST METHOD BN 017-01 (b) Wrap the thread around the narrow dimension of the frame until the opening is completely covered with thread one layer thick. (c) Mount the polyethylene or fiberboard frame in a suitable holder on the rotating rack of the Fadeo
6、meter in a vertical position. (d) Expose for the number of standard fading hours designated by the Engineering material specification and under the operating condition described in SAE J 1885. 2. Prior to performing the tensile tests (original and aged) ensure that the specimens have been conditione
7、d at 23 +/- 2 OC and a relative humidity of 50 +/- 5 % for 24 h. 3. Determine the tensile strength of ten threads in the original condition and ten threads in the aged condition as described in ASTM D 204, at a constant speed of 300 mm/minute. 4. Compute the average tensile strength and calculate th
8、e percentage loss as follows: % loss in tensile strength = oriainal tensile - aaed tensile x 1 O0 original tensile Method B - Seat Belt Webbing 1. Expose the seat belt webbing in a Fadeometer, using the following method: (a) Measure and cut two samples 1 O00 mm in length from 3 seat belt assemblies.
9、 (b) Take one specimen from each seat belt assembly and fold each end of the webbing sample so that a 300 mm strip is exposed in the center of the sample. (c) Clamp each of the folded ends of webbing to the revolving frame of the Fadeometer so that the webbing is in a vertical position, as shown in
10、Figure 1. 2. Expose for 200 standard fade h or as specified by the applicable Engineering Material Specification and under the operating conditions described in SAE J 1885. 3. Prior to performing the tensile tests (original and aged) ensure that the specimens have been conditioned at 23 +/- 2 OC and
11、 a relative humidity of 50 +/- 5 % for 24 h. 4. Determine the tensile strength of the two samples in the original condition and the two samples in the aged condition as required by the applicable Engineering Material Specification. 5. Compute the average tensile strength and calculate the percentage
12、 loss as follows: % loss in tensile strength = oriainal tensile - aaed tensile x 1 O0 original tensile Page 2 of 4 Copynght02001, Ford Global Technologies, Inc FORD LABORATORY TEST METHOD BN 017-01 6. Using the average tensile strength, calculate the percentage retained tensile strength as follows:
13、 retained tensile strength = aaed tensile strenath x 1 O0 original tensile strength Chemicals, materials, parts, and equipment referenced in this document must be used and handled properly. Each party is responsible for determining proper use and handling in its facilities. Page 3 of 4 Copynght02001, Ford Global Technologies, Inc FORD LABORATORY TEST METHOD BN 017-01 DETERMINATION OF THE EFFECT OF FADEOMETER AGING ON TENSILE STRENGTH OF SEWING THREADS AND SEAT BELTS CLIP BOTH ENDS w I -ACCORDION FOLD Figure 1 Page 4 of 4 Copynght02001, Ford Global Technologies, Inc
