| Summary: | 碩士 === 國立中央大學 === 土木工程研究所 === 94 === Many nations take advantage of uniaxial compaction to produce buffer materials. This research aims to discuss the mechanical behavior of powders in compaction with numerical method.
The buffer material blocks usually have three shapes, inculding disk, fan, and ring. With rational consideration and appropriate material parameters in finite elements analysis（ABAQUS）, this research attempts to distinguish the diversity among these buffer material blocks. Drucker-Prager/Cap Model was chosen as the yield surface of the medium, which represents the failure and yield behaviors.
In addition, as the buffer material blocks in the process of compaction, it will produce wall friction between the block and the die. The relationship between compaction stress and density cannot reveal the characteristics of the powders in compaction. It’s necessary to find out the friction-free curve that without limited in the experimental conditions. This research use zero as the coefficient of friction and average integral method to get friction-free curve, and make these results to compare with the former researches in order to verify the feasibility of numerical analysis.
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