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research-article

Assessment of the Fracture toughness using small punch tests of pre-notched specimens

[+] Author and Article Information
Yangyan Zheng

School of Mechanical and Power Engineering, Nanjing Tech UniversitySpecial Equipment Safety Supervision Inspection Institute of Jiangsu Province
yangyanz@hotmail.com

Chen Xiao

School of Mechanical and Power Engineering, Nanjing Tech UniversitySpecial Equipment Safety Supervision Inspection Institute of Jiangsu Province
3508436745@qq.com

Zheng Yang

School of Mechanical and Power Engineering, Nanjing Tech University
708844057@qq.com

Xiang Ling

School of Mechanical and Power Engineering, Nanjing Tech University
xling@njtech.edu.cn

1Corresponding author.

ASME doi:10.1115/1.4037046 History: Received January 12, 2017; Revised June 02, 2017

Abstract

In this paper line- and ring-notched SPT specimens were studied, a 3D model of a ring-notched SPT specimen was established using the contour integral method, and the validity of the model was verified using ring-notched specimens. The stress and strain fields were analyzed using numerical simulations of a ring-notched SPT specimen, and the change in the stress gradient during deformation was considered. To verify the finite element model, the results of the numerical simulations were compared with those of three-point bending tests and a Gurson-Tvergaard-Needleman (GTN) model. Compared with the line-notched specimen, the ring-notched specimen was more suitable for crack propagation analysis and fracture toughness evaluation. The results of the numerical simulations were in good agreement with those of the experiments, which showed that the numerical model used in this study was correct. For a crack that initiated when the load reached its maximum value, the value of the J integral was 335 kJ/m2, and at time 0.85Pmax, the value of the J integral was 201 kJ/m2, and the difference from the result of the three-point bending test was 14.4%. For a crack that initiated during the stretching deformation stage, the relevant fracture toughness was 225 kJ/m2, and the difference from the result of the three-point bending test was 3%.

Copyright (c) 2017 by ASME
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