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Research Papers: Materials and Fabrication

Transformation of BS7448-CTOD to ASTM E1290-CTOD

[+] Author and Article Information
Yoichi Kayamori, Takehiro Inoue

 Nippon Steel Corporation, 20-1 Shintomi, Futtsu, Chiba 293-8511, Japan

Tetsuya Tagawa

 Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan

J. Pressure Vessel Technol 132(4), 041401 (Jul 23, 2010) (7 pages) doi:10.1115/1.4001196 History: Received October 27, 2008; Revised February 01, 2010; Published July 23, 2010; Online July 23, 2010

Experimental and analytical investigations into crack tip opening displacement (CTOD) were conducted to demonstrate the relationship between BS7448-CTOD and ASTM E1290-CTOD. The CTOD test results showed that ASTM-CTOD was occasionally much lower than BS-CTOD both in single edge notch bend specimens and in compact tension (C(T)) specimens for low-strength structural steels, and this tended to be more remarkable in C(T) specimens. In addition, the analytical results of simplified elastic-plastic fracture parameter calculation using the Electric Power Research Institute scheme demonstrated that the ratio of ASTM-CTOD to BS-CTOD was not constant but varied according to CTOD changes. Material factors such as the yield stress, the strain hardening exponent, specimen size and configurations influenced the CTOD ratio, and low strain hardening exponents in the Ramberg–Osgood relation and C(T) specimen configuration significantly decreased the CTOD ratio. An equation that transforms BS-CTOD into ASTM-CTOD is proposed in this study. This equation gives a good estimate of ASTM-CTOD from BS-CTOD.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Dependence of the critical δBS7448 on CTOD test temperature

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Figure 2

Dependence of the critical δASTM E1290 on CTOD test temperature

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Figure 3

Relationship between δBS7448 and δASTM E1290 in their critical values of SE(B) specimens

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Figure 4

Relationship between δBS7448 and δASTM E1290 in their critical values of C(T) specimens

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Figure 5

Relationship between δBS7448 and δASTM E1290/δBS7448 in their critical values of SE(B) specimens

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Figure 6

Relationship between δBS7448 and δASTM E1290/δBS7448 in their critical values of C(T) specimens

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Figure 7

δASTM E1290∕δBS7448 versus δBS7448 in three different σys models

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Figure 8

δASTM E1290∕δBS7448 versus δBS7448 in three different N models

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Figure 9

δASTM E1290∕δBS7448 versus δBS7448 in three different thicknesses

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Figure 10

δASTM E1290/δBS7448 versus δBS7448 in two different specimen configurations

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Figure 11

Relationship between δel,ASTM E1290 and f1⋅δel,BS7448 in their critical values

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Figure 12

Relationship between δpl,ASTM E1290 and f1⋅f2⋅(P/P0)⋅δpl,BS7448 in their critical values

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Figure 13

Relationship between δASTM E1290 and f1{δel,BS7448+f2⋅(P/P0)⋅δpl,BS7448} in their critical values

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Figure 14

Relationship between δASTM E1290 and f1{δel,BS7448+f2⋅(P/P0)⋅δpl,BS7448}/δASTM E1290 in their critical values

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