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manmeet123
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Please can anybody explain why Impact testing is carries out @ -20 degree or @ lower temparatures. & what will happen if it is conducted @ higher temp.
Please elaborate.
Please elaborate.
russ_watters said:Well - can you think of how the properties of materials might change with temperature?
Charpy impact testing is performed at -20°C because it is considered a standard testing temperature that is representative of real-life scenarios. It is also the temperature at which the material's ductile-to-brittle transition typically occurs, making it a critical temperature to test for material toughness.
At -20°C, the material's toughness is typically reduced due to the ductile-to-brittle transition. This transition occurs when the material becomes more brittle and less able to absorb energy, making it more susceptible to fracture.
Testing at higher temperatures can provide valuable information about the material's behavior at different temperatures. This is particularly important for materials that will be used in environments with varying temperature conditions. It can also help determine the temperature at which the material transitions from ductile to brittle behavior.
The impact energy of a material typically decreases as the temperature increases. This is because at higher temperatures, the material becomes more ductile and is able to absorb more energy before fracturing. However, this can vary depending on the specific material and its composition.
Aside from temperature, there are several other factors that can affect Charpy impact testing results. These include the type of material, its composition and microstructure, the rate of loading, and the notch geometry. It is important to carefully control these factors in order to obtain accurate and reliable testing results.