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Research on Dynamic Compressive and Tensile Properties of SiCp/2024Al Composite

Author: ShiJiaYi
Tutor: PangBaoJun
School: Harbin Institute of Technology
Course: Solid Mechanics
Keywords: Metal matrix composites High strain rate Split Hopkinson Bar SEM
CLC: TB331
Type: Master's thesis
Year: 2008
Downloads: 127
Quote: 1
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Abstract


Particle reinforced metal matrix composites were applied widely due to its low density, specific stiffness and strength properties. Some of those applications were involved with dynamic loadings. While the behavior between the quasi-static loading and dynamic loading is quite different, it is necessary to research the dynamic properties of this material.The dynamic mechanical properties of particle reinforced metal matrix composites SiCp/2024Al were investigated by experiments and numerical simulation, respectively, mainly including contents as follows:The compressive mechanical properties of SiCp/2024Al were investigated above strain rate of 2500s-1 by using Split Hopkinson Pressure Bar (SHPB) and stress-strain curves under various strain rates were obtained. The results showed that in dynamic compression, 40.vol%SiCp/2024Al composite performed a good deformation, a higher modulus and a higher yield stress compared with matrix materials. Strain rates did not affect much on flow stress of 40.vol%SiCp/2024Al. Different from the matrix’s strain-hardening properties, 40.vol%SiCp/2024Al performed a strain-softening properties under high strain rates. 50.vol% SiCp/2024Al. deformed with obvious brittle properties with split fracture.In order to research the deformation and failure mechanism of SiCp/2024Al, high-speed camera was used to record the experimental process, and Scanning Electron Microscopy (SEM) was also applied to analyze the microstructure. According to the SEM pictures, the strain-softening performance of 40.vol% SiCp/2024Al composite under high strain rates is due to the inner damage and the soften matrix. Many micro particle fractures and softened aluminum matrix were observed in the 50.vol%SiCp/2024Al specimens, which can explain the split fracture properties of 50.vol%SiCp/2024Al under high strain rates.Meanwhile, dynamic tensile properties of SiCp/2024Al composites were also investigated by using Split Hopkinson Tension Bar (SHTB). The result showed that SiCp/2024Al composites performed obvious brittle properties under dynamic tension. Compared with the properties of matrix under dynamic tension and properties of SiCp/2024Al composites under dynamic compression, the properties of SiCp/2024Al composites under dynamic tension decreased dramatically.Two axi-symmetric unit cell models were set by using finite element software LSDYNA, to simulate the dynamic compression of SiCp/2024Al composites. Meanwhile, the effect of particle volume and aspect ratio were investigated. The numerical results showed a tendency of increased yield stress and flow stress, with increasing of particle volume and aspect ratio. The strain-hardening turned to strain-softening with increasing of strain. There was a symmetric phenomenon between needle-like reinforced particles and disk-like reinforced particles, only needle-like reinforced particles had a stronger reinforced effect.

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CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Composite materials > Metal composite materials
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