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Thermo mechanical Analysis
Features
- Temperature
range -150 up to 1000°C
- Static and dynamic TMA
measurements possible
- 5 different measuring systems
for expansion, elasticity, 2 x penetration tests, expansion of threads
- Software control of load and
all other parameters
- MS Windows 32 Bit Software
Description Thermo mechanical analysis (TMA) easily and
rapidly measures sample displacement (growth, shrinkage, movement, etc.) as a
function of temperature, time, and applied
force.
Traditionally, TMA is used to characterize linear expansion, glass
transitions, and softening points of materials by applying a constant force to a
specimen while varying temperature.
For expansion
measurements, a probe rests on a sample on a stage with minimal downward
pressure. Other constant force experiments include measurement of penetration,
bending, tension, shrinkage, swelling, and creep (sample motion measured as a
function of time under an applied load).
In
Dynamic TMA (DTMA), a known sinusoidal stress and linear temperature ramp are
applied to the sample, and the resulting sinusoidal strain is measured.
Typical
Applications
- Tension studies
of the stress/strain properties of films and fibers
- Determination of softening
behavior
- Glass transition temperatures
and secondary transitions
- Phase change determination
- Determination of mechanical
behavior under applied force
- Determination of expansion
coefficient (dilatometry)
- Sintering behavior
- Volumetric expansion
- E modulus
- Slipping and friction
resistance
Application example
TMA
PVC sample
In this picture
you can see the test run of a PVC sample starting from room temperature.The
glass point is at 93,2° C. The elastic range starts from approx. 150°C. At
higher temperatures the change into the plastic range is very good visible.