TA Instruments TMA 2940 CE, Руководство оператора

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TA I
NSTRUMENTS
TMA 2940 CE 4–17
Flexure Accessory
Flexure Accessory
Description
The Flexure Accessory can be used on the
TMA 2940 CE for three-point bending studies
to measure the flexibility and strength of a
variety of materials, such as composites, plastics,
and PC boards. It employs a knife-edged probe
and a sample platform with two knife edges
spaced 5.08 mm (0.2 inches) apart. This acces-
sory permits the determination of deflection
temperature under load.
Required loading is calculated using the following
equation:
2 Sbd
2
P =
3 L
Where:
P = calculated load (N)
S = maximum fiber stress (Pa)
(1 psi = 6.895 x 10 3 Pa)
b = sample width (m)
d = sample depth (m)
L = width of span between the
knife edge supports of the
flexure platform
(5.08 x 10
-3
m).
The flexure accessory kit contains:
• Flexure probe assembly
• Flexure sample platform.