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| Fatigue Life Degradation of 7075-T6 Aluminum Alloy Sheets Strengthened by Cold Extrusion with Different Number of Holes under Pre-corrosion Condition |
| Received:February 28, 2024 Revised:March 25, 2024 |
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| DOI：10.7643/issn.1672-9242.2024.05.013 |
| KeyWord:cold extrusion strengthening porous aluminum alloy sheet pre-corrosion fatigue S-N curve C(t) curve damage mechanism |
| Author | Institution |
| WANG Changkai |
Air Force Engineering University, Shaanxi Xi'an , China |
| ZHANG Teng |
Air Force Engineering University, Shaanxi Xi'an , China |
| ZHANG Tianyu |
Air Force Engineering University, Shaanxi Xi'an , China |
| HE Yuting |
Air Force Engineering University, Shaanxi Xi'an , China |
| JIANG Haibo |
Air Force Engineering University, Shaanxi Xi'an , China |
| GUO Jinkui |
93108 Troops, Heilongjiang Qiqihaer , China |
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| Abstract: |
| The work aims to study the fatigue life degradation law and damage mechanism of aluminum alloy sheets strengthened by single-hole and multi-hole cold extrusion in corrosive environment. Two kinds of three-hole cold extrusion strengthened 7075-T6 aluminum alloy sheets with different hole spacing were used to carry out pre-corrosion fatigue tests for different corrosion time in laboratory accelerated corrosion spectrum simulating tropical marine atmospheric environment. The C(t) curve, fatigue S-N curve and damage morphology characteristics of three-hole extrusion strengthened aluminum sheets and single-hole extrusion strengthened aluminum sheets with triple hole spacing were obtained, and the corrosion mechanism and extrusion strengthening effect of extrusion strengthened specimens after corrosion were analyzed. At the same time, the experimental results of specimens with different number of holes were compared, and the effect of the number of holes on the corrosion and fatigue properties of extrusion strengthened aluminum sheets was explored. The results show that the fatigue performance of the extruded aluminum alloy sheet after corrosion is significantly degraded, the corrosion damage is mainly denudation, and the fatigue crack initiation position is transferred from the hole edge to the surface. The number of extrusion holes has little effect on the fatigue and corrosion fatigue performance of extrusion strengthened aluminum alloy sheets. |
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