1、 Low-Temperature Fracture Test MachineTechnical Specifications
2.1Test Temperature:-70℃—0℃
2.2Impact Speed:2m/s±0.2m/s
2.3After reaching a constant temperature, the test3minTemperature Fluctuation within Time: ＜±0.5℃
2.4Distance from impactor center to the bottom of the chuck:11±0.5mm
2.5Approximate dimensions:650×550×1300mm
2.6Power:1100w
2.7Cooling Well Volume:700ml
2.8Power Supply:AC220V
2、Low-Temperature Brittle Test MachineStructural Principles
3.1Adjustable Clamping Fixture
The lifting clamp is composed of a cylinder with a clamp and a cylinder base.
The distance from the impact point of the sample to the bottom of the clamp11.0±0.5mm
3.2Impact Device
Impact device consists of an impactor and an impact cylinder
3.3Impactor
Impactor head shape and dimensions comply withGB1682Standard specifications. The weight of the impactor is:200±20gThe working schedule is40±1mmThe impact cylinder, in its reset state, measures the distance from the impactor tip to the sample.25±1mm。
3.4Chilled Medium
Typically used industrial ethanol
3.5This testing instrument utilizes semiconductor cooling.
4Instructions for Use
4.1Plug in the power, the temperature controller and timer display lights will illuminate.
4.2Inject a refrigerant (typically industrial ethanol) into the cold well, ensuring the distance from the bottom of the holder to the liquid surface is75±10mm。
4.3Secure the sample vertically in the clamp. Avoid clamping too tightly or too loosely to prevent deformation or detachment of the sample.
4.4After reaching the test temperature, press the start button, and the testing machine will automatically operate (press the clamp, start freezing the sample, and simultaneously activate the timing control switch or press the stopwatch for timing. The freezing time of the sample is specified as:3.0±0.5minDuring the freezing period of the sample, the temperature fluctuation of the freezing medium shall not exceed ±1℃）
4.5Remove the sample and bend it along the impact direction.180Examine closely for any damage.
4.6After impact testing (each sample is only allowed to be impacted once), if destruction occurs, increase the temperature of the refrigerant medium; otherwise, decrease its temperature and continue the test.
4.7Temperature Control Method:aPlease provide the Chinese content to be translated.setKey, the temperature controller enters the setup state
bPress the "<" key to move to the desired location.
cPress the "^" key to adjust temperature.
dPlease follow the "setKey confirm
Through repeated testing, it has been determined that at least two samples do not break at the same temperature, and at least one sample breaks at a different temperature; if the difference between these two results is no greater than1At ℃, the test is complete.
5、 Test Standards
5.1Specs
Sample length:25.0±0.5mmWidth:6.0±0.5mm, thickness2.0±0.3mm。5.2Requirements
The sample surface should be smooth, free of foreign impurities and damage. The finished product should be trimmed to the corresponding size after being polished.
