Abstract
The paper analyzes the characteristics of the damage area around the shrapnel penetration part of titanium alloy OT4 skin of the aircraft during the live ammunition damage test. The skin of a bullet hole in a certain model of aircraft is cut as a test sample. Through micro-hardness (DPH), metallographic structure (OM), microstructure (SEM), and microscopic analysis of energy spectrum (EDS), it makes statistics and analyzes the microstructure of damage area of skin, verifies the damage scope and influence area of the shrapnel penetration area, determines the damage repair boundary around the missile shrapnel penetration area, and lays a theoretical foundation for carrying out in-situ growth repair of titanium alloy structure based on micro-arc additive technology in future.
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