PSI - Issue 17

Available online at www.sciencedirect.com Structural I tegrity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com ScienceDirect

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Procedia Structural Integrity 17 (2019) 21–28

ICSI 2019 The 3rd International Conference on Structural Integrity Analytical model for estimation of energy release rate at mode I crack tip in bi-material of identical steels joined by an over-matched weld interlayer ICSI 2019 The 3rd International Conference on Structural Integrity Analytical model for estimation of energy release rate at mode I crack tip in bi-material of identical steels joined by an over-matched weld interlayer

Sunil Bhat a *, H. Adarsha b , V. Ravinarayan c and V.P. Koushik d a,b,c d Department of Mechanical Engineering, SET, Jain University, Bangalore-562112, Karnataka, India Sunil Bhat a *, H. Adarsha b , V. Ravinarayan c and V.P. Koushik d a,b,c d Department of Mechanical Engineering, SET, Jain University, Bangalore-562112, Karnataka, India

Abstract Abstract

Structure fabricated by welding identical steels or a fractured steel component repaired by steel weld filler of different strength leads to the presence of two interfaces with strength mismatch across them. Mode I crack in such a bi-material upon growing across the weld interlayer experiences the effect of the interfaces that manifests by way of change in crack tip energy release rate from the far field or remote value. The paper presents a strain based analytical model for estimation of the effect of interface over the crack tip. Crack tip energy release rate is determined at all the positions of the crack under SSY or K dominant conditions. The weld interlayer is assumed to be homogeneous and over-matched which possesses higher strength than that of the constituent steels. The modulus of elasticity is same throughout the domain. Edge crack of various discrete lengths is investigated in infinite body under uniform monotonic tension of 150 MPa in plane stress situation for demonstration of the model behavior. Structure fabricated by welding identical steels or a fractured steel co ponent repaired by steel weld filler of different strength leads to the presence of two interfaces with strength mismatch across them. Mode I crack in such a bi-material upon growing across the weld interlayer experiences the effect of the interfaces that manifests by way of change in crack tip energy release rate from the far field or remote value. The paper presents a strain based analytical model for estimation of the effect of interface ver the crack tip. Crack tip energ release rate is deter ined at all the positions of the crack under SSY or K dominant conditions. The weld interlayer is assumed to be homogeneous and over-matched which possesses higher strength than that of the constituent steels. The modulus of elasticity is same throughout the domain. Edge crack of various discrete le gths is investigated in infinite body under uniform monotonic tension of 150 MPa in plane stress situation for demonstration of the model behavior.

© 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers.

Keywords: Analytical model; Energy release rate; Interface; Plasticity; Steels; Strength mismatch; Weld interlayer Keywords: Analytical model; Energy release rate; Interface; Plasticity; Steels; Strength mismatch; Weld interlayer

1. Introduction 1. Introduction

Structural parts fabricated by welding identical steels or a fractured steel component repaired by weld filler of steel wire of different strength are commonly found in engineering industry. Two interfaces with strength mismatch Structural parts fabricated by welding identical steels or a fractured steel component repaired by weld filler of steel wire of different strength are commonly found in engineering industry. Two interfaces with strength mismatch

* Corresponding author. Tel.:09047288750 E-mail address: snlbhat@rediffmail.com * Correspon ing author. Tel.:09047288750 E-mail address: snlbhat@rediffmail.com

2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. 2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers.

2452-3216  2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. 10.1016/j.prostr.2019.08.004