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Interpreting Results
There are different ways to interpret TABER
Rotary Platform Abraser (Abrader) test results.
They can range from a visual inspection to a
detailed computer analysis using TaberWear™ 1.0.
The method of evaluation that you select should
reflect the type of material that is being
tested. In many cases, if you are following a
specification - the method for interpreting test
results will be listed.
Test results are typically expressed as a wear
factor or numerical abrasion index of the test
specimen. The most common methods of evaluating
results from the Taber Abraser (Abrader)
include:
Visual End Point - Test ends when there
is a clearly marked change in specimen
appearance or other characteristic. When the
abrasion test end-point is described in a
material specification, the end-point may
consist of pass/fail criteria such as yarn
breakage, loss in coating, loss of luster,
napping, pilling, color loss, or other changes
in appearance. Specimens are typically compared
with a known standard of the material tested.
Weight Loss - Usually shown in
milligrams, indicates how much material has been
removed by abrasion.
|
where |
L = weight loss
A = weight of test specimen before abrasion
B = weight of test specimen after abrasion |
Taber Wear Index - Indicates rate of
wear, and is calculated by measuring the loss in
weight (in milligrams) per thousand cycles. The
lower the wear index, the better the abrasion
resistance.
|
where |
I = wear index
A = weight of test specimen before abrasion
B = weight of test specimen after abrasion
C = number of cycles |
Volume Loss - For specimens of different
specific gravities. Using a correction factor,
you can obtain a true indication of wear
resistance.
Depth of Wear - Measure the depth of the
wear with an instrument such as an OPTICAL
MICROMETER.
Wear Cycles Per Mil - Represents the wear
cycles required to break through a coating of a
certain thickness.
|
where |
W = wear cycles per mil
D = cycles required to wear coating through
to substrate
T = thickness of coating, mils (0.001 in)to
one decimal place |
Residual Breaking Force (textile fabrics) - The
effective strength of the fabric, or force required to break
a specific width of fabric. To determine the individual
breaking force of the abraded specimen use the procedure
described in the ASTM D5034 and D5035 Standard Test Method
for Breaking Strength and Elongation of Textile Fabrics. To
work, you must change the distance between clamps to 25mm
and horizontally place the path of abrasion on the abraded
specimen midway between the clamps. Report the breaking load
to the nearest 0.5kg.
Average Breaking Strength (textile fabrics) -
Calculated by averaging the breaking strength of the abraded
specimens and the unabraded specimens, as determined by the
Residual Breaking Force.
Percentage Loss in Breaking Strength (textile fabrics)
- To determine the breaking load of the original fabric and
the abraded specimen, use the procedure noted above (ASTM
D5034 and D5035). Calculate the percentage loss in breaking
strength to the nearest 1% for each lengthwise and widthwise
directions.
|
where |
AR% = abrasion resistance, %
X = breaking force before abrasion, g(lb)
Y = breaking force after abrasion, g(lb) |
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