自然科学版 英文版
自然科学版 英文版
自然科学版 英文版

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中南大学学报(英文版)

Journal of Central South University

Vol. 25    No. 4    April 2018

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Elastic and plastic deformation behavior analysis in small punch test for mechanical properties evaluation
YANG Si-sheng(杨思晟), LING Xiang(凌祥), DU Peng(杜鹏)

School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing 211816, China

Abstract:In order to estimate deformation and mechanical properties of material accurately, elastic and plastic deformation behavior of small punch test was discussed in this paper. A two-dimensional finite element model was established based upon the Gurson-Tvergaard-Needleman(GTN) equation. According to the integration of load–displacement curves with different displacements, the evolution of elastic energy was obtained. The results show that the elastic energy increases quickly in the initial region and tends to be an approximate constant during the plastic bending phase. Meanwhile, an obvious change of the slope of load–displacement curve can be found in the elastic-plastic transition region. The macroscopic deformation and fracture feature were also discussed in order to verify the deformation analysis. Finally, the yield strength, tensile strength and elongation of AISI304 were obtained based on the analysis of deformation energy and percent fracture deflection. The results have a good agreement with that of conventional tensile tests, which may provide a theoretical basis of small punch analysis.

 

Key words: small punch test; mechanical properties; elastic energy; fracture characteristic

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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