带网格内筋铝合金壳体热旋压组织与性能

doi:10.7527/S1000-6893.2025.31981

Abstract

Abstract:

Thin-walled aluminum alloy shells are extensively demanded in aerospace， subsea equipment， and other fields because of their lightweight and other properties. Incorporating inner ribs within the shell can enhance its overall structural strength.The split-petal mandrel structure was innovatively designed to fabricate aluminum alloy shells with grid internal reinforcement via the strong staggered spinning technique. The preparation processes were systematically conducted under both room temperature and elevated temperature conditions. Using the Abaqus numerical simulation method and integrating experimental investigations， this study explored the plastic deformation mechanisms within aluminum alloy during the formation of meshed inner ribs at different spinning temperatures. The micro-nano mechanical properties of the reinforced regions and the tensile strength of the shell were characterized， and the strengthening-toughening mechanisms were investigated by correlating microstructural observations with fracture surface morphology analysis. The results indicate that the morphology and orientation of aluminum alloy grains undergo minimal changes at different spinning temperatures. The ribbon-shaped grains with the ｛001｝ orientation exhibit a pronounced preferred orientation. As the spinning temperature increases， the texture is a typical cube texture， while the texture intensity decreases from 5.31 to 3.92. The spinning temperature exerts a significant influence on the uniformity of the equivalent strain distribution on the inner and outer surfaces of the shell. Specifically， the equivalent strain value of the shell diminishes as the spinning temperature rises. Additionally， with the temperature increasing （from room temperature to 380 ℃）， the strengthening effect of fine grains weakens. Consequently， the yield strength of the shell increases from 207.2 MPa to 244.1 MPa， and the elongation increases from 15.7% to 21.6%. However， when the temperature reaches 420 ℃， the elongation of the shell decreases substantially due to factors such as the non-uniform distribution of hard phases. The fracture location at the TIR occurs at the root of the meshed rib.

Key words: hot spinning, 5A06 aluminum alloy, shell with grid reinforcement, mechanical property, toughening mechanism

CLC Number:

V261.3⁺3

Haolin LI, Hongsheng CHEN, Fei CHAI, Jie LIANG, Baodong WANG, Huihui NIE, Ke YUAN. Microstructure and performance of hot spinning of aluminum alloy shell with internal grid reinforcement[J]. Acta Aeronautica et Astronautica Sinica, 2026, 47(3): 431981.

Figures/Tables 24

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Microstructure and performance of hot spinning of aluminum alloy shell with internal grid reinforcement

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