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TECHNICAL PAPERS

Evaluation of Prestraining and Dynamic Loading Effects on the Fracture Toughness of Structural Steels by the Local Approach

[+] Author and Article Information
Fumiyoshi Minami

Department of Manufacturing Science, Osaka University, Osaka 565-0871, Japane-mail: minami@mapse.eng.osaka-u.ac.jp.

Kazushige Arimochi

Plate and Structural Steel Project Promoting Department, Sumitomo Metal Industries Ltd., Hyogo 660-0891, Japane-mail: arimochi-kzs@sumitomometals.co.jp

J. Pressure Vessel Technol 123(3), 362-372 (Apr 20, 2001) (11 pages) doi:10.1115/1.1379532 History: Received November 22, 2000; Revised April 20, 2001
Copyright © 2001 by ASME
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References

Figures

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Geometry of round-bar and compact specimens—(a) round-bar tension specimen, (b) compact specimen
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Increase in yield stress and tensile strength with prestrain
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Prestraining effect on stress-strain curve
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Change in nominal stress and strain with time during high-speed loading of round-bar tension specimen
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Increase in yield stress and tensile strength with strain rate
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Comparison between ΔσYPD,ΔσTPD and ΔσYP+ΔσYD,ΔσTP+ΔσTD, where ΔσYPD and ΔσTPD are actual increases in yield stress and tensile strength by dynamic loading combined with prestraining, and ΔσYP,ΔσTP and ΔσYD,ΔσTD are levels of strength increase by prestraining and dynamic loading, respectively
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Uniform elongation in different conditions of strain rate and temperature
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Effect of prestrain and loading rate on critical CTOD at brittle fracture initiation—(a) effect of prestrain, (b) effect of loading rate
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Combined effects of prestrain and loading rate on CTOD test results
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Comparison between ΔTPD and ΔTP+ΔTD, where ΔTPD is actual temperature shift of critical CTOD in dynamic loading combined with prestraining, and TP and ΔTD are those caused by prestraining and dynamic loading, respectively
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FE-model of compact specimen
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Nominal stress-nominal strain curve and temperature rise during high-speed loading of round-bar specimen obtained by FE-analysis and experiments
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Characterization of yield stress and tensile strength in different test conditions with rate-temperature parameter R—(a) without prestrain (virgin steel), (b) with 5 percent prestrain, (c) with 10 percent prestrain
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Effects of prestrain and loading rate on stress fields near crack tip of compact specimen—(a) effect of prestrain, (b) effect of loading rate
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Combined effects of prestrain and loading rate on near-tip stress fields for compact specimen
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Variation of near-tip strain rate with CTOD for compact specimen, where strain rate is evaluated at a local region including a peak value of maximum principal stress
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Near-tip temperature rise ΔT as a function of CTOD for compact specimen, where ΔT is evaluated at a local region including a peak value of maximum principal stress
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Distributions of the critical Weibull stress in different conditions of prestrain and loading rate computed with m-value obtained in static condition without prestrain
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Medians of the critical Weibull stress in different test conditions
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Procedure for prediction of fracture toughness in seismic condition based on the Weibull stress fracture criterion
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Cumulative distributions of critical CTOD under prestrained and dynamic conditions predicted by the local approach—(a) effect of prestrain, (b) effect of loading rate, (c) combined effects of prestrain and loading rate
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Reference temperature concept for fracture toughness evaluation in seismic condition
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Procedure for determining ΔσfPD−ΔTPD relationship by the local approach, where ΔσfPD and ΔTPD are elevation of flow stress and temperature shift of fracture toughness, respectively, caused by prestraining and dynamic loading—(a) calculation of Weibull stress-CTOD relationship, (b) evaluation of critical CTOD transition curve based on the Weibull stress fracture criterion, (c) formation of ΔσfPD−ΔTPD relationship
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Comparison between ΔσfPD−ΔTPD relationship determined by the Weibull stress fracture criterion and that obtained by experiments
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Application of ΔσfPD−ΔTPD relationship determined in this study to fracture toughness test results of structural steels SN490B

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