A Modified Split Hopkinson Pressure Bar for Closed-cell Aluminium Foam

• Main Authors: Pai, Hao-Yu, 白皓宇
• Other Authors: Jang, Wen-Yea
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/24539578529337834218

碩士 === 國立交通大學 === 機械工程系所 === 104 === The present study aims to investigate the dynamic response of ALPORAS® closed-cell aluminum foam by means of experimental and numerical efforts. A modified SHPB (Split Hopkinson Pressure Bar) technique was used for the dynamic crushing experiments. Consider that the impedance of the foam specimens was much lower than that of aluminum, the material of the strike and incident bars, a hollow aluminum bar was incorporated to replace the conventional solid transmission bar in order to enhance the transmission signals. Experimental results showed that the maximum strain as well the local maximum stress increased with increasing strain rates while on the other hand the effect of the strain rate on Young’s modulus was found to be insignificant. On the numerical modeling, numerical models were developed using the commercial FE code ABAQUS. The bar material was assumed to be linearly elastic while CRUSHABLE FOAM model was assumed as the constitutive model for the foam specimens. With appropriately chosen loading and boundary conditions, the numerical simulations were able to reproduce experimental results successfully.