Metallic materials in the use of the process, in addition to the requirement to have sufficient strength and ductility, but also requires sufficient toughness. Toughness is the ability of the metal to absorb deformation energy before breaking. The toughness of the metal is usually increased with the loading speed, the lower the temperature, increased stress concentration decreases.
Resilience is a measure mechanical properties of the material notch sensitivity, especially to reflect the sensitivity of the gap of the material at low temperatures or impact loads. Resilience is a comprehensive reflection of the strength and ductility of the material. The good plasticity steel toughness generally better. High strength and plasticity stuff regulating valve material, the better the toughness. Commonly used test methods and indicators impact toughness.
GB10623-1989 "Test terms of the mechanical properties of metals and impact toughness is defined as: predetermined shape and dimensions of the sample in the impact test force under the action of breaking the absorbed power is called the Charpy absorbed energy. The impact notch at the bottom of unit cross section of the shock absorption function called impact toughness. The impact toughness mechanical performance under dynamic load rating of metallic materials to withstand impact resistance.
Impact test, in order to be able to sensitively shows the electric control valve material chemical composition, microstructure and processing technology to small changes in their toughness, so that the material is tough the brittle transition semibrittle state test. Therefore, usually with notched specimens, the fracture to the impact toughness of the material under impact loading.
Proved, impact value is very sensitive tissue defects sensitive to small changes in reaction material quality, macro defects and microstructure. The impact test is an effective means of pneumatic control valve of the metallurgical quality of the test material and brittle tendency
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