1、FORD LABORATORY TEST METHOD EU BN 003-02 2001 0822 DETERMINATION OF TENSILE STRENGTH AND ELONGATION OF GENUINE LEATHER Revised Editorial - no technical change A. Cockman Application This method is used to determine the tensile strength and elongation at break of genuine leather. Apparatus Required T
2、ensile Testing Machine With a constant rate of jaw separation of 125 mm/minute. The machine must also be equipped with a recording device. Thickness Measurement Gauge Incorporating a circular contact plate of 200 mm2 in area, which exerts a load of 500 g/cm2 on the specimen. Accuracy 0.025 mm. Speci
3、men Cutting Die ASTM D 412, Type A dumbbell. Slide Gauge 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 under the same co
4、nditions unless otherwise specified. Procedure 1. Cut 4 specimens from the sample in line with positions indicated in the sketch. 2. Measure and record the average thickness of each specimen by taking readings at centre of neck and 25 mm either side of centre position. I Date I Action I Revisions I
5、Copyght02001, Ford GlobalTechnologies, Inc FORD LABORATORY TEST METHOD EU BN 003-02 3. Mark off a gauge length of 50 mm in the centre of the neck of each specimen without damaging them. 4. Insert the specimen into the jaws of the tensile machine and pull at the rate of I25 mm/minute unless otherwise
6、 specified by the relevant Engineering Specification. 5. Record the maximum load (kg) necessary to break the specimen. 6. Using the slide gauge, record the elongation at break. Evaluation For each specimen, calculate: 1. Elongation at break (%) = L, - Lo x 100 Lo Where: Lo = Original gauge length in
7、 mm LI = Gauge length at break in mm 2. Tensile Strength (N/m2) = F x 100 WxT Where: F = Maximum load in kg T = Thickness of specimen in mm W = Awage width of specimen neck in mm Report the average values of the 4 specimens. Chemicals, materials, parts, and equipment referenced in this document must
8、 be used and handled properly. Each party is responsible for determining proper use and handling in its facilities. Page 2 of 3 Copyright0 2001, Ford Global Technologies, Inc FORD LABORATORY TEST METHOD EU BN 003-02 DETERMINATION OF TENSILE STRENGTH AND ELONGATION OF GENUINE LEATHER Direction of Sample Selection Page 3 of 3 Copyright0 2001, Ford Global Technologies, Inc
