Contents lists available at ScienceDirect Progress in Materials Science journal homepage: www.elsevier.com/locate/pmatsci Elastic constant determination of unidirectional composite via ultrasonic bulk wave through transmission measurements: A review David A.P. Paterson a, ⁎ , Winifred Ijomah a , James F.C. Windmill b a Design Manufacture and Engineering Management, University of Strathclyde, Scotland, United Kingdom b Centre for Ultrasonic Engineering, Department of Electronic and Electrical Engineering, University of Strathclyde, Scotland, United Kingdom ARTICLE INFO Keywords: Elastic constants Uni-directional carbon fibre reinforced plastic CFRP Ultrasound Velocity Through transmission ABSTRACT The determination of the elastic constants of unidirectional carbon fibre composite via immersion based ultrasound is an established area with much literature. Existing literature reviews in this area discuss the extant literature but do not offer a deep review of the seminal publications during this period, but instead focus on reporting the contributions of the published literature. Thus, a gap in knowledge exists for a comprehensive literature review charting the evolution of how the elastic constants of uni-directional carbon fibre composite are determined via immersion based ultrasonic through transmission. This work addresses this. Building on previous literature, this paper reviews seminal publications in chronological order, with the benefits, drawbacks and contributions to knowledge of each reviewed publication identified within this work. This review is bounded from 1970 to 2015, (some 45 years of literature), and maps the progression of technological and scientific advancement of the through transmission technique; that is, seminal literature during this period is both identified and reviewed in chronological order thus de- monstrating how each paper builds on previous work. This paper also documents two novel information tables, which for the first time allow the significant contributions to knowledge during this period to be quickly identified. 1. Introduction Carbon fibre reinforced plastics (CFRP) are becoming increasingly common, with applications in industrial such as aerospace, wind turbine, automotive, sport equipment and construction [1]. Owing to increasing environmental and waste legislation [2–4] combined with the high cost of composites to manufacture, CFRP re-use, in particular CFRP recycling, is also field of on-going research [5–8]. With increasing application of CFRP, it is important to have testing methods suitable for both virgin and recycled materials. A wealth of existing literature on characterization of virgin materials, particularly in the field of non-destructive evaluation (NDE) may be found [9–11], with themes such as ultrasound, X-ray, thermography, eddy current analysis all featuring. This review focuses on one area of CFRP non-destructive evaluation, that of ultrasonic analysis. The field of ultrasonic NDE is diverse with areas such as pulse echo, laser generated ultrasound, acoustic emission, through transmission, guided waves, bulk waves, surface waves, reflection and transmission analysis, point source point receiver techniques, air coupled analysis, elastic constant determination and defect detection found in literature. In terms of CFRP a similar argument is https://doi.org/10.1016/j.pmatsci.2018.04.001 Received 1 June 2017; Received in revised form 13 November 2017; Accepted 18 April 2018 ⁎ Corresponding author. E-mail addresses: [email protected] (D.A.P. Paterson), [email protected] (W. Ijomah), [email protected] (J.F.C. Windmill). Progress in Materials Science 97 (2018) 1–37 Available online 20 April 2018 0079-6425/ © 2018 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/BY/4.0/). T