Damage Modes and Response Mechanisms of AlSi10Mg Porous Structures Under Different Loading Strain Rates
Received date: 2023-11-07
Revised date: 2024-03-20
Online published: 2024-04-02
Supported by
State Key Laboratory of Dynamic Measurement Technology(2022-SYSJJ-03)
AlSi10Mg is a frequently utilized aluminum alloy known for its low density, high specific strength, strong energy absorption capability, and good impact resistance. It holds significant appeal in the aviation, automotive, and machinery sectors and is particularly used as protective structures for critical aerospace components. In particular, in complex application scenarios, these protective structures are often subjected to impacts from foreign objects at different loading rates. This leads to diverse forms of damage and unpredictable damage patterns, ultimately jeopardizing key components and disrupting the normal operation of associated parts. Herein, through extensive research into the preparation, properties, and factors influencing AlSi10Mg porous structures, an understanding of the intrinsic relationship between the porous metal structure and its properties is revealed. This is important for improving material properties, expanding application possibilities, and promoting scientific and technological advancement. Exploring the application potential of AlSi10Mg porous structures across various fields offers theoretical support and technical guidance for its practical utilization. Moreover, this will provide new insights and methodologies for the future development of aluminum alloys with porous structures. By conducting a series of experimental studies, theoretical analyses, and numerical simulations, the load-bearing capacity, damage modes, and damage mechanisms of the optimized AlSi10Mg porous structures under different loading strain rates were examined. The rusults showed that the predominant damage modes in AlSi10Mg porous structures are fracture and shear damages, and the mechanical behavior is unaffected by the loading strain rates. The combination of structural damage analysis and high-precision numerical simulations revealed that under axial compressive loading, the AlSi10Mg porous structures experiences shear damage caused by relative misalignment along the diagonal cross section. This failure mode is the direct cause of the fracture damage of the structure. Furthermore, combined experimental and theoretical analyses indicated that the energy absorption properties of the AlSi10Mg porous structures are maintained at low and medium strain rates when the strain of the structures is less than 10%. When the strain exceeds 10%, the energy absorption properties at medium strain rates slightly improve compared to those at low strain rates. The energy absorption properties of the AlSi10Mg porous structures remain almost unchanged under different strain rates ranging from 378 to 1639 s-1.
CAI Xuanming , ZHANG Wei , FAN Zhiqiang , GAO Yubo , WANG Junyuan , ZHANG Zhujun . Damage Modes and Response Mechanisms of AlSi10Mg Porous Structures Under Different Loading Strain Rates[J]. Acta Metall Sin, 2024 , 60(7) : 857 -868 . DOI: 10.11900/0412.1961.2023.00440
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