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On-line Access: 2010-10-05

Received: 2010-04-08

Revision Accepted: 2010-07-28

Crosschecked: 2010-09-15

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Journal of Zhejiang University SCIENCE A 2010 Vol.11 No.10 P.782-788

http://doi.org/10.1631/jzus.A1000153


Estimation of the J-resistance curve for Cr2Ni2MoV steel using the modified load separation parameter Spb method


Author(s):  Chen Bao, Li-xun Cai

Affiliation(s):  School of Mechanics and Engineering, Southwest Jiaotong University, Chengdu 610031, China

Corresponding email(s):   bchxx@163.com, lix_cai@263.net

Key Words:  Load separation, J-resistance curve, Separation parameter Spb, Blunt cracked specimen, Forced blunting calibration


Chen Bao, Li-xun Cai. Estimation of the J-resistance curve for Cr2Ni2MoV steel using the modified load separation parameter Spb method[J]. Journal of Zhejiang University Science A, 2010, 11(10): 782-788.

@article{title="Estimation of the J-resistance curve for Cr2Ni2MoV steel using the modified load separation parameter Spb method",
author="Chen Bao, Li-xun Cai",
journal="Journal of Zhejiang University Science A",
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pages="782-788",
year="2010",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A1000153"
}

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%A Chen Bao
%A Li-xun Cai
%J Journal of Zhejiang University SCIENCE A
%V 11
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%D 2010
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A1000153

TY - JOUR
T1 - Estimation of the J-resistance curve for Cr2Ni2MoV steel using the modified load separation parameter Spb method
A1 - Chen Bao
A1 - Li-xun Cai
J0 - Journal of Zhejiang University Science A
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IS - 10
SP - 782
EP - 788
%@ 1673-565X
Y1 - 2010
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.A1000153


Abstract: 
Based on load separation theory, the load separation parameter Spb method is an effective approach for estimating the J-resistance curve from records of load versus displacement directly, using one sharp cracked specimen and an additional reference blunt cracked specimen. However, the effect of the reference blunt cracked specimen on J-resistance determination was not explicitly considered in past work. In this paper, a modified load separation parameter Spb method was developed to eliminate this effect, and then a unique estimation of instantaneous crack length for one sharp cracked specimen could be obtained. Furthermore, a forced blunting calibration method was also adopted to determine the instantaneous crack length in the load inseparable region, referring to a normalization method. Experiments on steam turbine rotator steel Cr2Ni2MoV were carried out to estimate J-resistance curves using an unloading compliance method. By removing unload and reload data from load-displacement records, the J-resistance curve for the same sharp cracked specimen was estimated using the modified separation parameter Spb method. The results indicate that the modified Spb method completely eliminates the effect of the reference blunt cracked specimen on the instantaneous crack length determination of the sharp cracked specimen. However, different J-resistance curves in a small range of crack extension are present when different blunting coefficients are used in the blunting line equation. The J-resistance curve obtained from the modified Spb method agrees well with that obtained from the compliance method.

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