PSI - Issue 60

Md Rakim et al. / Procedia Structural Integrity 60 (2024) 298–310

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Md Rakim et al. / Structural Integrity Procedia 00 (2023) 000 – 000

© 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the ICONS 2023 Organizers Keywords: Ageing; Elastic-plastic fracture toughness ( J IC ); Monotonic loading; J-R curve.

Nomenclature W

specimen width

specimen thickness

B

net thickness

B N

crack size

a

initial crack size crack extension

a 0

∆ a

initial uncracked ligament length

b 0

normalized crack size

α

force range

ΔP

elastic stress intensity factor stress intensity factor range

K

ΔK

R C

load ratio

normalized K-gradient

σ YS σ TS

yield strength

ultimate strength

σ Y

effective yield strength

Poison ratio

ν

E Young’s modulus J J-integral

dimensionless constant

elastic component of J plastic component of J

J el J pl J IC

fracture toughness

1. Introduction

Towards the design of Advanced Ultra Super Critical (AUSC) plants, alloy 617M resembles suitable material in areas constituting high-temperature components like boiler tubes and rotors owing to its inherent mechanical strength at elevated temperatures, good oxidation resistance, microstructural stability over prolonged use and weldability [Q. Wu (2006), J.P. Strizak et al. (1982), A.D. Gianfrancisco (2016)]. The material has to withstand an operating