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A CTOD equation based on the rigid rotational factor with the consideration of crack tip blunting due to strain hardening for SEN(B)

Khor, Weeliam (2019) A CTOD equation based on the rigid rotational factor with the consideration of crack tip blunting due to strain hardening for SEN(B) Fatigue & Fracture of Engineering Materials & Structures.

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Abstract

Crack tip opening displacement (CTOD) from national and international standards was shown to give different values. This paper investigates the feasibility of CTOD determined based on the concept of rigid rotational factor in single‐edge notched bend (SENB) specimens. Based on validated modelling methods, finite element (FE) models were simulated for crack ratios 0.3 ≤ a0/W ≤ 0.7 and yield‐to‐tensile ratio 0.44 ≤ σys/σuts ≤ 0.98. This covers cases of shallow to deeply cracked specimens and a wide range of strain hardening properties. CTOD obtained from the FE models was used as the basis of a newly implemented strain hardening corrected rotational factor, which considers the effects of crack tip blunting due to strain hardening, rp sh. An improved equation considering strain hardening was implemented based on the rp sh. The equation gives accurate estimation of CTOD from the FE models compared with the equation from BS 7448‐1, ASTM E1820, and WES 1180.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Authors :
NameEmailORCID
Khor, Weeliamw.khor@surrey.ac.uk
Date : 3 April 2019
DOI : 10.1111/ffe.13005
Copyright Disclaimer : © 2019 The Authors Fatigue & Fracture of Engineering Materials & Structures Published by John Wiley & Sons Ltd This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Uncontrolled Keywords : CTOD; Rotational factor; Strain hardening; Varied crack length
Depositing User : Clive Harris
Date Deposited : 31 May 2019 13:56
Last Modified : 31 May 2019 13:56
URI: http://epubs.surrey.ac.uk/id/eprint/851916

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