Abstract
This paper investigates the low-energy electrons emitted from metal cracks. A mathematical model of low-energy electron emission from metals was established. A low-energy electron sensor system with a double grid air counter core was designed to measure the number of electrons emitted. The experiment was performed on 2024 Al. The results show that the detection system is effective for testing the number of low-energy electrons. When a crack expands due to applied force, the number of electrons detected increases with force, which shows that the double grid air counter sensor system can judge the development of cracks by measuring the number of low-energy electrons. The number of electrons detected increases with temperature, which verifies that the temperature influences low-energy electron emission.
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