Strain measurement in a temperature chamber during tensile tests is associated with a series of challenges that result from both the environment and the measuring methods. In many cases, optical extensometers are used for strain measurement. However, tactile long-distance extensometers can also be used in a temperature chamber if they are equipped accordingly. For this purpose, temperature chambers in a special design with a lateral feed-through for the measuring arms of the extensometer are used. The measuring devices of the MFX series are suitable for determining characteristic values (e.g. determination of the elongation at break and the increase of the elastic straight line) on a wide variety of materials. Special measuring arms enable the extensometer to be used in a temperature range from -50 °C to 300 °C. With the option of extending the measuring arms by a certain length, the range of these can be increased into the temperature chamber. Opening and closing of the measuring arms and approaching the initial device measuring length L0 is done automatically via the LabMaster software, so that no manual intervention in the temperature chamber is necessary during the test.
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| Fig. 1: Tensile testing machine inspekt table with temperature chamber and long-distance extensometer | Fig. 2: Lateral feed-through at the temperature chamber for the measuring arms of the extensometer | Fig. 3: Special measuring arms of the extensometer for a temperature range of -50 °C to 300 °C |
