1、FORD LABORATORY TEST METHOD BN 129-01 Date Action 2001 O924 Revised 1990 02 27 TEAR RESISTANCE AND RECOVERY OF MOLDED FIBER PADS Revisions Editorial - no technical change A. Cockman Application This test method is used to determine the ability of a molded fiber pad to retain shape and resist tearing
2、 after severe deformation and/or crushing. Method “A“: Determination of spring-back after deformation and observance of any tearing or cracking of the fiber pad. Method “B“: Determination of recovery after crushing. Apparatus and Materials Required Test Fixtures - for Methods A and B; refer to Figur
3、es 1 and 2 Molded Test Form - Refer to Figure 3 for dimensions. Molded Test Sample Refer to Figure 3 for dimensions and the applicable Engineering Material Specification for thickness. Conditioning and Test Conditions All test values indicated herein are based on material conditioned in a controlled
4、 atmosphere of 23 +/- 2 “C and 50 +I- 5 % relative humidity for not less than 24 h prior to testing and tested under the same conditions unless otherwise specified. Procedure Method “A“ 1. Mold the fiber pad to the dimensions shown in Figure 3, or as specified in the applicable Engineering Material
5、Specification. 2. Clamp the molded fiber pad into the fixture, shown in Figure 1. Copyright02001, Ford Global Technologies, Inc FORD LABORATORY TEST METHOD BN 129-01 3. Place the 80 x 115 mm plate onto the sample and add weight without impact loading to total 15 kg, or as specified in the applicable
6、 Engineering Material Specification. The test sample should be forced inside out. 4. Remove the weights, plate, and sample from the fixture. 5. Repeat steps 2, 3, and 4 using the inverted sample. 6. Examine the sample for cracking and tearing, especially at the corners. Report as specified in the En
7、gineering Material Specification. Method “B“ 1. Place the sample into the flat surface shown in Figure 2. 2. Measure the height of the top surface of the sample from the flat surface (TI). 3. Place the 300 x 300 mm plate on top of the sample and add weights to total 75 kg, or as specified in the app
8、licable Engineering Material Specification. 4. Maintain the load for two hours, remove weights and plate, and allow to recover for 5 minutes. 5. Measure the height of the top surface (T2) 6. Calculate and report the percent recovery: percent recovery = 12 x 1 O0 TI Chemicals, materials, parts, and e
9、quipment referenced in this document must 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 BN 129-01 TEAR RESISTANCE AND RECOVERY OF MOLDED FIBER P
10、ADS Smooth, flat plate (80 x 1 15 mm) with weight Total wt. - 15 kg Figure I. Method A - Springback wing bolt (6 places) 200 mm (typical) Test Fixture (approximately 300 x 300 mm) Smooth, flat plate weight .i height ,. smooth, flat surface Figure 2. Method B - Recovery Apparatus e Dimensions are in mm. Figure 3. Molded Test Sample Configuration Page 3 of 3 Copyright0 2001, Ford Global Technologies, Inc
