1、FORD LABORATORY TEST METHOD BN 015-03 2001 0822 ENERGY ABSORPTION OF PADDING MATERIALS Revised Editorial - no technical change A. Cockman Application This procedure is used to test the energy absorption characteristics of cotton, foam rubber, felt and similar padding materials used for interior trim
2、 applications. Scope This procedure consists of sibjecting a test specimen of the padding material to cyclic loading under closely controlled conditions and calculating the energy absorption of the sample at the completion of the specified number of cycles. Thickness, weight and energy absorption ma
3、y be determined on the same instrument. Apparatus Required Electronic Testing Machine Instron Model 7M or equivalent.* Accessories Compression Load Cell CC - Catalog No. A-17 Gage Length and Rapid Return Controls - Catalog No. A-36 Extension Cycling Controls - Catalog No. A-37 Load Cycling Controls
4、- Catalog No. A-38 Automatic Integrator - Catalog No. A-80 Reference - Operating Manual * Instron Engineering Corporation 2500 Washington Street Canton, MA Conditioning and Test Conditions All test values indicated herein are based on material conditioned in a controlled atmosphere of 23 +/- 2 OC an
5、d 50 +/- 5 % relative humidity for not less than 24 h prior to testing and tested under the same conditions unless otherwise specified. I Date I Action I Revisions I Copynght02001, Ford Global Technologies, Inc FORD LABORATORY TEST METHOD BN 015-03 1. 2. 3. 4. 5. 6. 7. 8. 9. 1 o. 11. Procedure Die c
6、ut a 4 by 4 inch sample of the padding material. Condition after cutting for 24 h at 65 +/- 2 % relative humidity and 70 +/-2 OF. Calibrate the instrument and the integrator following the directions in the instruction manual, then proceed as follows: (a) Balance the instrument and integrator and cal
7、ibrate for weight by placing a 1 Ib weight on the load cell and making adjustments as necessary. Turn the integrator counter switches to ”On” position and turn Manual -Automatic switch to ”Automatic” position. Set the load cam for 25 Ib compression load cycling (see manual). Set crosshead speed to 1
8、 inch/minute by using proper gear combination as shown in gear selection chart for various crosshead speeds (see manual). Slowly lower crosshead until no clearance exists between crosshead and load cell. (Final zero clearance should be made by turning the manual positioning control knob and adjustin
9、g distance by observing ”no load” on recorder chart - see manual). Set ”Return” dials on control panel to zero, set ”Gage Length” dials for required number of inches to allow for placement of sample, then raise crosshead to that position. (b) (c) (d) (e) (9 With scale setting at 1 Ib, place the test
10、 specimen on the loading cell and read weight from chart. The chart recorder indicates in pounds. Weight should be converted to ounces per square foot. Again balance the instrument, using the ”Fine” balance knob to offset the weight of the sample. Apply a load of 0.1 Ib at 1 inch/minute and stop the
11、 machine. Read the thickness of the test specimen under 0.1 Ib load directly from the ”Return” dials. Record as (TI) in inches. Set ”Upper” extension cycle dials to zero. Set full scale load to 50 Ib range. Clear counters on the integrator. With the Instron set for compound cycling between ”load” as
12、 the upper limit and ”extension” as the lower limit, switch the ”Manual - Automatic” control knob to ”Automatic” (or ”load cycle control”) and push the ”Down” button to start the test. Page 2 of 4 Copynght02001, Ford Global Technologies, Inc FORD LABORATORY TEST METHOD BN 015-03 12. At the completio
13、n of the first 25 Ib loading, observe the compressed thickness of the test specimen as shown on the “Return“ dials. Record as (T2 in inches). (The crosshead movement should not be stopped, since it is possible to read (T2) without interrupting the test in progress). 13. Calculate percent compression
14、 as follows: % compression = T, - T, x 100 T, Where TI = original thickness under 0.1 Ib load and T2 = compressed thickness under 25 Ib load 14. Continue the test for ten complete cycles of loading and unloading 15. Read the counters on the integrator at the completion of the ten cycles and record t
15、he energy absorption units as follows: Energy absorption units (X) = load units minus recovery units 16. Calculate energy absorption value of the test specimen as follows: E = X x L x S = X x 50 x 1 = X 5000 5000 100 Where E = energy in inch pounds L = full scale load in Ib (50 Ib) S = rate of sampl
16、e load in inches/minutes (1 inch/minute) X = energy absorption units (Step 15) 17. All values obtained must be adjusted to a common basis of a 2 inch thick sample, using the following formula: Adjusted energy absorption = TI Where E = energy absorption value (Step 16) TI = original thickness (Step 7
17、) 18. Calculate percent recovery as follows: Determine 5 thickness immediately after reading the integrator on the IOth cycle by switching the full scale to 1 Ib on the chart recorder. Read the T3 thickness at a 0.1 Ib load. % recovery T, - T2 x 1 O0 TI - T2 Page 3 of 4 Copynght02001, Ford Global Te
18、chnologies, Inc FORD LABORATORY TEST METHOD BN 015-03 19. Calculate density of sample as follows: Density (odcu ft) = weiaht in odsa ft x 12 TI 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 4 of 4 Copynght02001, Ford Global Technologies, Inc
