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Fracture toughness estimation of ductile materials using a modified energy method of the small punch test

Published online by Cambridge University Press:  27 August 2014

Sisheng Yang ,
Zheng Yang  and
Xiang Ling
Sisheng Yang
Affiliation:
Jiangsu Key Laboratory of Process Enhancement and New Energy Equipment Technology, School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing 211816, China
Zheng Yang
Affiliation:
Jiangsu Key Laboratory of Process Enhancement and New Energy Equipment Technology, School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing 211816, China
Xiang Ling*
Affiliation:
Jiangsu Key Laboratory of Process Enhancement and New Energy Equipment Technology, School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing 211816, China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

The fracture property estimation of ductile materials with small volumes at room temperature was performed experimentally and analytically in this study. A modified energy method of the small punch test (SPT) was applied to estimate fracture toughness based on the membrane stretch analysis. The effective strain was assumed to be the average value of center strain and contact boundary strain. To overcome the problem involved in strain calculation by microscopic observation, one relatively simple correlation which related effective fracture strain to displacement was proposed. The results obtained by the modified energy model and conventional experiment were in good agreement. Furthermore, a three-dimensional finite element model was established successfully. The influence of ball diameter and center hole diameter in the lower die on the SPT was analyzed by detailed discussion. Finally, the applicability and accuracy of the modified energy model based on the SPT were proved. An economic, effective energy method can be obtained from the present study to assess the properties of in-service components and micrometer scale materials.

Keywords

fracturesimulationsteel
Type
Articles
Information
Journal of Materials Research , Volume 29 , Issue 15 , 14 August 2014 , pp. 1675 - 1680
Copyright
Copyright © Materials Research Society 2014 

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References

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