Strain-Rate Relationship of Aluminum Matrix Composites Predicted by Johnson-Cook Model

Abstract:

Strain-rate sensitivities of 55-65vol.% aluminum 2024-T6/TiB₂ composites and the corresponding aluminum 2024-T6 matrix were investigated using split Hopkinson pressure bar. Results showed that 55-65vol.% aluminum 2024-T6/TiB₂ composites exhibited significant strain-rate sensitivities, which were three times higher than that of the aluminum 2024-T6 matrix. The strain-rate sensitivity of the aluminum 2024-T6 matrix composites rose obviously with reinforcement content increasing (up to 60%), which agreed with the previous researches. The aluminum 2024-T6/TiB₂ composites showed hybrid fracture characteristics including particle cracking and aluminum alloy softening under dynamic loading. The flow stresses predicted by Johnson-Cook model increased slowly when the reinforcement volume fraction ranged in 10%-40%. While the reinforcement volume fraction was over 40%, the flow stresses of aluminum matrix composites increased obviously and the strains dropped sharply. Keywords: Composite materials; Dynamic compression; Stress-strain relationship

• Periodical: Materials Science Forum (Volumes 704-705)
• Pages: 935-940
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.704-705.935
• Online since: December 2011
• Authors: De Zhi Zhu, Wei Ping Chen, Yuan Yuan Li
• Keywords: Composite Material, Dynamic Compression, Stress-Strain Relationship

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