TABER LINEAR ABRADER A SCOUTING METHOD The method
TABER LINEAR ABRADER A SCOUTING METHOD
The method so far (Section 10) 1. Mount the Film 2. Select the Weights to Add to the Shaft 3. Set the Instrument Parameters a. Stroke Length: 1 inch b. Stroke Speed: 30 cycles/minute c. Base plate of Flexible Material Holder is mounted, aligned 4. Run the Test 5. Report Weight in grams, Number of Cycles to Breakthrough
Question: What Weight to Use? 1. Too Heavy – Gouges the Film 2. Too Light – The Test Takes Too Long 3. Limitation: Only Two Shafts Currently Available a) b) c) d) Long Shaft – 84. 3 grams Short Shaft – 43. 4 grams Weight Holder – 74. 1 grams Remaining Equipment (Chuck, Stylus) – 13. 6 grams 4. Minimum Weight Without Weight Holder = 57. 3 grams 5. Minimum Weight With Weight Holder = 131. 4 grams
Survey Procedure (Appendix) 1. Test the Film at Different Weights 2. Use a Minimum of Four Weight in 50 gram Increments a) Minimum: 50 -100 Cycles to Breakthrough b) Maximum: Less Than 9000 Cycles to Breakthrough (5 Hours) 3. Test the Sample a Minimum of 3 Times at Each Weight 4. Plot a Graph of Total Weight vs. Number of Cycles to Breakthrough
Taber Abrasion of Formed Films, MD 3000 2500 2000 Number of Cycles to Puncture A B R 2 = 0. 9291 R 2 = 0. 9103 C D 1500 E Expon. (A) Expon. (B) Expon. (C) 1000 Expon. (D) Expon. (E) R 2 = 0. 9101 500 R 2 = 0. 9746 0 R 2 = 0. 8921 50 100 150 200 250 300 Weight in Grams 350 400 450 500
Advantages of This Approach 1. 2. 3. 4. 5. 6. 7. Picture of Overall Abrasion Resistance of a Film Knowledge Library of Different Film Structures Logical Selection of a Weight That Differentiates The Films Different Weights Can Be Chosen For Different Studies Conduct the Test in a Reasonable Time Without Gouging Understanding the Relationship Between Weight and Failure Choosing a Single Weight Avoids Trying to Relate the Effects of Different Weights in a Single Study.
Disadvantages of the Approach 1. 2. 3. 4. 5. Requires Time-Consuming Up-Front Work Curves Must Use the Same Weight Range Program to Evaluate the Relationship Must Be Available Film Thickness, MD/TD, Structural Differences Not Included Within-Replicate Variation at Long Test Times Cause Poor Curve Fit
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