Effect of external magnetic field on electric current-induced fracture of notched thin metallic conductors: Part 2- High magnetic fields

Telpande, S and Jain, S and Kumar, P (2024) Effect of external magnetic field on electric current-induced fracture of notched thin metallic conductors: Part 2- High magnetic fields. In: Theoretical and Applied Fracture Mechanics, 130 .

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Abstract

In the companion report (Telpande et al., n.d.), we discussed the impact of a weak external magnetic field (up to 0.4 T) on the electric current-induced fracture of pre-notched thin metallic conductors, revealing a linear decrease in critical current density, jc, necessary for crack propagation. This study extends the investigation to explore the effects of stronger external magnetic fields (0.6�1 T) on the fracture of pre-notched, current-carrying metallic foils. The experimental analysis reveals a substantial, albeit linear, drop (up to 40 ) in jc under stronger magnetic fields. Interestingly, calculations of the dynamic stress intensity factor, KIE,t, which assesses the interplay between applied current density and external magnetic field, indicate crack growth under a strong magnetic field even when KIE,t is below the plane stress critical stress intensity factor, KIC. A remarkable phenomenon emerges: the application of electric current pulses combined with strong external magnetic fields induces observable surface undulations near the notch tip. A comprehensive 3D finite element model, integrating linear and nonlinear buckling analyses under multiphysics stimuli, attributes these undulations to localized buckling near the notch tip. This buckling-induced stress redistribution near the crack tip contributes to an overall reduction in fracture toughness due to mode mixity, leading to the fracture of the Al foil below KIC. This investigation, along with the companion report (Telpande et al., n.d.), significantly advances our understanding of the effects of magnetic fields on the fracture of current-carrying conductors. © 2024 Elsevier Ltd

Item Type:	Journal Article
Publication:	Theoretical and Applied Fracture Mechanics
Publisher:	Elsevier B.V.
Additional Information:	The copyright for this article belongs toElsevier B.V.
Keywords:	Buckling; Crack propagation; Crack tips; Ductile fracture; Electric currents; Fracture toughness; Magnetic fields, Electric current induced fracture; Electromagnetic forces; External magnetic field; High magnetic fields; K IC; Linear decrease; Metallic conductor; Stress intensity factor K; Stress-intensity factors; Strong magnetic fields, Stress intensity factors
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	04 Mar 2024 05:46
Last Modified:	04 Mar 2024 05:46
URI:	https://eprints.iisc.ac.in/id/eprint/84135

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