Characterization of metal fatigue by optical second harmonic generation

Arnolds, Heike ORCID: 0000-0002-5723-9309, Kakoulli, Anthony, Shah, Komalben and Patterson, Eann ORCID: 0000-0003-4397-2160 (2017) Characterization of metal fatigue by optical second harmonic generation. APPLIED PHYSICS LETTERS, 111 (13). 131901-.

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Abstract

<jats:p>The optical second harmonic response of a pre-fatigued titanium specimen to picosecond 800 nm pulses has been investigated. Polarization-dependent measurements show that the zxx component of the nonlinear susceptibility tensor χ(2) differs markedly when measured in a region of unfatigued polycrystalline titanium compared to the plastic deformation zone ahead of a crack tip and even changes the sign within the plastic wake. This tensor component is sensitive to bulk currents, and we attribute the observed changes to a changed density of states at the Fermi level, caused by the accumulation of dislocations. Second harmonic polarization analysis could thus be useful in non-invasive fatigue analysis.</jats:p>

Item Type:	Article
Depositing User:	Symplectic Admin
Date Deposited:	02 Oct 2017 09:15
Last Modified:	14 Mar 2024 19:16
DOI:	10.1063/1.4995694
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3009730