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Research Papers: Design and Analysis

Experimental Study on the Cleavage Fracture Behavior of an ASTM A285 Grade C Pressure Vessel Steel

[+] Author and Article Information
Rafael G. Savioli, Claudio Ruggieri

Department of Naval Architecture
and Ocean Engineering,
University of São Paulo,
São Paulo 05508-060, Brazil

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received March 13, 2014; final manuscript received June 1, 2014; published online October 15, 2014. Assoc. Editor: Marina Ruggles-Wrenn.

J. Pressure Vessel Technol 137(2), 021206 (Oct 15, 2014) (7 pages) Paper No: PVT-14-1041; doi: 10.1115/1.4028003 History: Received March 13, 2014; Revised June 01, 2014

This work addresses an experimental investigation on the cleavage fracture behavior of an ASTM A285 Grade C pressure vessel steel. One purpose of this study is to enlarge previously reported work on mechanical and fracture properties for this class of steel to provide a more definite database for use in structural and defect analyses of pressurized components, including pressure vessels and storage tanks. Another purpose is to determine the reference temperature, T0, derived from the Master curve methodology which defines the dependence of fracture toughness with temperature for the tested material. Fracture toughness testing conducted on single edge bend SE(B) specimens in three-point loading extracted from an A285 Grade C pressure vessel steel plate provides the cleavage fracture resistance data in terms of the J-integral and crack tip opening displacement (CTOD) at cleavage instability, Jc and δc. Additional tensile and conventional Charpy tests produce further experimental data which serve to characterize the mechanical behavior of the tested pressure vessel steel. The experimental results reveal a strong effect of specimen geometry on Jc and δc-values associated with large scatter in the measured values of cleavage fracture toughness. Overall, the present investigation, when taken together with previous studies, provides a fairly extensive body of experimental results which describe in detail the fracture behavior of an ASTM A285 Grade C pressure vessel steel.

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Figures

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Fig. 1

Definition of the plastic area under the load–CMOD curve for a single edge bend SE(B) specimen in three-point loading

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Fig. 4

Typical evolution of measured load versus displacement (CMOD) curve for the shallow and deeply cracked 1-T SE(B) specimens

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Fig. 3

Charpy-V impact energy (T-L orientation) versus temperature for the tested A285 Gr C steel

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Fig. 2

Engineering stress–strain response at room temperature for the tested A285 Gr C steel

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Fig. 7

Master curve for ASTM A285 Gr C steel including 5% and 95% confidence bounds based on cleavage fracture toughness values measured 1-T standard SE(B) specimens with a/W = 0.5

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Fig. 5

(a) Typical fracture surface for the deeply cracked 1-T specimen with a/W = 0.5 at −80 °C showing no evidence of plastic deformation at the crack front; (b) and (c) SEM of the fracture surface for the deeply cracked 1-T specimen with a/W = 0.5 at −80 °C

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Fig. 6

Cumulative probability distribution of experimentally measured KJc-values for all tested specimen geometries

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