Metal tensile test according to ISO 6892 with GALDABINI tensile testing machine
Control for metal testing according to method A of ISO 6892
Already at the beginning of 2009 we had a Tensile testing machine Quasar 100 kN with a control system according to ISO 6892-1 Method A was delivered. This meant GALDABINI one of the first companies to implement the control for a metal tensile test based on a strain control. In the elastic range, the control type “Closed Loop” (reference variable strain gauge) and in the plastic range the control mode “Open Loop” (reference variable traverse path) is used.
The delivery took place approximately 8 months before the ISO 6892 standard came into force, as BMW insisted on carrying out the tensile tests according to method A. In the meantime, tens of thousands of tests have been carried out with this machine for this and other customers (MAGNA, voestalpine, etc.). Tensile testing machine QUASAR 100 is equipped with high-quality hydraulic parallel closing clamping device and fully automatic long-distance strain gauge.
tensile testing machine Quasar 100 kN
MICRON MOTOR
hydraulic clamping device
high-temperature tensile test (hot tensile test)
GALDABINI – Universal testing machine with hot draft furnace: test method at elevated temperature
When materials are used in areas of elevated temperatures, they must be tested according to the operating conditions. Typical operating conditions for heat-resistant steels are, for example, pipe and container construction in power plants, district heating, waste incineration plants, etc. These steels are also used in engines, ship engines, aircraft turbines, etc.
If the temperature rises, the tensile strength and yield strength decrease. It is therefore essential that a tensile test is carried out at these temperatures.
GALDABINI's machines and equipment are ideally suited for this purpose. The sample is heated to the desired temperature in the hot-draft furnace (outside the testing machine) and is also subjected to a dwell time so that the core temperature of the sample also reaches the desired temperature.
Once the temperature has been reached, the high-temperature hot-drawing furnace, together with the heated sample and the strain gauge fixed to the hot-drawing furnace, is swung into the working area of the tensile testing machine. The hot-drawing rod is then coupled using bolts.
After the preload has been applied, the extensometer is inserted. The ceramic probe arms (with extremely sharp cutting edges) are pressed against the sample on one side. As soon as the sample is extended in the tensile test, the measuring arms are dragged along and provide a corresponding strain signal. Once the yield point is exceeded, a signal sounds from the PC and the extensometer is retracted.
Photos:
- Insert wedges in the clamping heads for coupling additional clamping tools
- spherically mounted coupling elements (clamped by the pneumatic clamping jaw actuation) with lock nut against
- movements after sample breakage
- Heat-tension adapter with screwed-on threaded head sample holders
- high-temperature furnaces 1000° / 1200° C
- high-temperature extensometer (strain gauge)
Tensile test with QUASAR 50 kN in thermal chamber (-70° to + 300° C)
on cooled samples
For all universal testing machines The QUASAR series includes thermal chambers/climate chambers for tests under temperature stress from -70 to 300 °C. The photo shows a thermal chamber in which a wedge can be removed from the lower part in order to conveniently remove this thermal chamber from the test room. After the wedge has been removed, the thermal chamber is moved backwards on rails.
In the thermal chamber, a wedge clamp can be seen that has been positioned at a 90° angle. This application can be used, for example, to carry out a tensile test on CFRP carbon fiber plastic.
Here you will find one universal testing machine
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