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All Outputs (161)

Wood properties & strength grading (2022)
Presentation / Conference Contribution
Ridley-Ellis, D. (2022, December). Wood properties & strength grading. Presented at James Jones & Sons Architects' and Structural Engineers' Open Day, Lockerbie

James Jones & Sons held an open day for architects and structural engineers at its flagship sawmill site in Lockerbie.

"James Jones & Sons' new visitor building at its flagship sawmill site in Lockerbie has attracted considerable interest in the... Read More about Wood properties & strength grading.

Correction of Evanescent Wave Influence on the Flexural Wave Velocity and Wavelength Estimation Based on a Mode Shape Function (2022)
Journal Article
Pantelić, F., Šumarac Pavlović, D., Mijić, M., & Ridley-Ellis, D. (2022). Correction of Evanescent Wave Influence on the Flexural Wave Velocity and Wavelength Estimation Based on a Mode Shape Function. Archives of Acoustics, 47(4), 539-546. https://doi.org/10.24425/aoa.2022.142017

The aim of this research is to use a simple acoustic method of a very near field recording, which enables measurement and display of oscillation modes, to estimate the velocity of flexural waves, based on the wavelengths of standing waves measured on... Read More about Correction of Evanescent Wave Influence on the Flexural Wave Velocity and Wavelength Estimation Based on a Mode Shape Function.

Strength Grading of Timber in the UK and Ireland in 2021 (2022)
Journal Article
Ridley-Ellis, D., Gil-Moreno, D., & Harte, A. M. (2022). Strength Grading of Timber in the UK and Ireland in 2021. International Wood Products Journal, 13(2), 127-136. https://doi.org/10.1080/20426445.2022.2050549

This paper summarises the state of the art for strength grading of construction timber grown in the United Kingdom and the Republic of Ireland. It includes the latest approvals based on recent research on spruce, larch and Douglas-fir. It lists the f... Read More about Strength Grading of Timber in the UK and Ireland in 2021.

The relationship between bending and tension strength of Irish and UK spruce and pine (2022)
Journal Article
Gil-Moreno, D., Ridley-Ellis, D., O'Ceallaigh, C., & Harte, A. M. (2022). The relationship between bending and tension strength of Irish and UK spruce and pine. European Journal of Wood and Wood Products, 80, 585-596. https://doi.org/10.1007/s00107-022-01787-6

The correct characterisation of wood properties is fundamental for the best utilisation of resources. In Europe, grading is defined by strength classes that are determined based on either bending or tension tests. The European standards give equation... Read More about The relationship between bending and tension strength of Irish and UK spruce and pine.

Grade in Britain: enabling a wider range of home grown species (2021)
Book Chapter
Ridley-Ellis, D. (2021). Grade in Britain: enabling a wider range of home grown species. In Timber 2020 Industry Yearbook (132-137). High Wycombe: TRADA

Dan Ridley-Ellis summarises the different home-grown species currently available, and looks to the future of strength grading for an increasingly wide range of species.

Estimating mechanical properties of clear wood from ten‐year‐old Melia azedarach trees using the stress wave method (2021)
Journal Article
Van Duong, D., & Ridley-Ellis, D. (2021). Estimating mechanical properties of clear wood from ten‐year‐old Melia azedarach trees using the stress wave method. European Journal of Wood and Wood Products, 79(4), 941-949. https://doi.org/10.1007/s00107-021-01664-8

The objective of this study was to examine the potential of stress wave velocity (SWV) as a rapid and non-destructive method to estimate the mechanical properties of Melia azedarach wood. The SWV, dynamic modulus of elasticity (MOE d), modulus of ela... Read More about Estimating mechanical properties of clear wood from ten‐year‐old Melia azedarach trees using the stress wave method.

InFutURe Wood Report 1: Design for deconstruction and reuse of timber structures – state of the art review (2020)
Report
Cristescu, C., Honfi, D., Sandberg, K., Sandin, Y., Shotton, E., Walsh, S., Cramer, M., Ridley-Ellis, D., Risse, M., Ivanica, R., Ui Chulain, C., Harte, A., De Arana-Fernandez, M., Llana, D., Iniguez-Gonzalez, G., Garcia Barbero, M., Nasiri, B., Hughes, M., & Krofl, Z. (2020). InFutURe Wood Report 1: Design for deconstruction and reuse of timber structures – state of the art review. ForestValue

This report represents the first publication of the InFutURe Wood project - Innovative Design for the Future – Use and Reuse of Wood (Building) Components.
InFutUReWood is supported under the umbrella of ERA-NET and financed by funding agencies from... Read More about InFutURe Wood Report 1: Design for deconstruction and reuse of timber structures – state of the art review.

A Shed Resource: A look at Wood Recycling in the UK (2020)
Presentation / Conference Contribution
Cramer, M., & Ridley-Ellis, D. (2020, September). A Shed Resource: A look at Wood Recycling in the UK. Paper presented at Timber 2020, Online

The secondary timber value chain was explored by interviewing companies involved in wood recycling. The interviewees include community wood recyclers, chip producers and board-making companies. This paper is a perspective of the wood recycling indust... Read More about A Shed Resource: A look at Wood Recycling in the UK.

Analysis of a wooden specimen's mechanical properties through acoustic measurements in the very near field (2020)
Journal Article
Pantelić, F., Mijić, M., Šumarac Pavlović, D., Ridley-Ellis, D., & Dudeš, D. (2020). Analysis of a wooden specimen's mechanical properties through acoustic measurements in the very near field. Journal of the Acoustical Society of America, 147(4), EL320-EL325. https://doi.org/10.1121/10.0001030

This paper presents the method for prediction of some basic mechanical parameters of a wood specimen by using simple instrumentation. The standard acoustic method for assessment of modulus of elasticity using the impulse excitation is extended by usi... Read More about Analysis of a wooden specimen's mechanical properties through acoustic measurements in the very near field.

The Mechanical and Resonance Assessment of Large Clear Samples of UK-Grown Beech Wood (2019)
Journal Article
Ridley-Ellis, D. (2019). The Mechanical and Resonance Assessment of Large Clear Samples of UK-Grown Beech Wood. Pro Ligno, 15(4), 32-39

The paper presents the results of non-destructive longitudinal resonance (impulse excitation technique), and mechanical flexural testing, of a batch of European beech wood (Fagus sylvatica L.), grown in the United Kingdom. The material was largely fr... Read More about The Mechanical and Resonance Assessment of Large Clear Samples of UK-Grown Beech Wood.

Timber grading potential of Douglas fir in the Republic of Ireland and the UK (2019)
Journal Article
Gil-Moreno, D., Ridley-Ellis, D., & Harte, A. (2019). Timber grading potential of Douglas fir in the Republic of Ireland and the UK. International Wood Products Journal, 10(2), 64-69. https://doi.org/10.1080/20426445.2019.1617984

Results of the recently approved machine control grading settings for Douglas fir in the Republic of Ireland and the UK have shown that the species can be graded to C18, and higher strength classes, and while there is a relatively high proportion of... Read More about Timber grading potential of Douglas fir in the Republic of Ireland and the UK.

Lesser-used UK-grown timber (2019)
Book Chapter
Ridley-Ellis, D. (2019). Lesser-used UK-grown timber. In TRADA Timber Industry Yearbook 2019 (200-205)

Daniel Ridley-Ellis looks at the grading properties of different species in comparison with the highly commercial Sitka spruce.

Grading of British Timber (2018)
Journal Article
Ridley-Ellis, D. (2018). Grading of British Timber. The Full Circle: The Journal of the Association of Scottish Hardwood Sawmillers, 34-36

A summary of grading of home grown timber for the magazine of the Association of Scottish Hardwood Sawmillers (ASHS).

Strength grading of timber in the UK in 2018 (2018)
Presentation / Conference Contribution
Ridley-Ellis, D. (2018, June). Strength grading of timber in the UK in 2018. Paper presented at Timber 2018, London

This paper summarises the state-of-the-art of strength grading of UK-grown timber. It lists the following information along with the primary references: visual grading grades and strength class assignments; grading machines with approved settings for... Read More about Strength grading of timber in the UK in 2018.

Impulse excitation measurement of small changes in elastic moduli and damping using R (2018)
Journal Article
Ridley-Ellis, D., Libeau, M., & Mignerat, D. (2018). Impulse excitation measurement of small changes in elastic moduli and damping using R. International Wood Products Journal, 1-6. https://doi.org/10.1080/20426445.2018.1475928

Impulse excitation is commonly used to assess wood stiffness in both scientific and industrial settings. Modes of vibration are excited by a mechanical impulse and their resonant frequencies measured to calculate elastic moduli. It is also possible t... Read More about Impulse excitation measurement of small changes in elastic moduli and damping using R.

Equipping ourselves for future forests and timber. (2018)
Presentation / Conference Contribution
Ridley-Ellis, D. (2018, May). Equipping ourselves for future forests and timber. Presented at Institute of Chartered Foresters National Conference

Presentation to the Institute of Chartered Foresters National Conference, "Innovation for change - New drivers for tomorrow’s forestry" Edinburgh 2-3 May 2013

https://www.charteredforesters.org/

TG1/201804/25rev Derivation of MTG grading machine settings for Douglas fir (IE & GB, C classes) (2018)
Report
Ridley-Ellis, D., & Gil-Moreno, D. (2018). TG1/201804/25rev Derivation of MTG grading machine settings for Douglas fir (IE & GB, C classes). Ljubljana: WoodProps for Ireland project

Grading machines
MTG 960
mtgBATCH 962 mtgBATCH 966
MTG 920
mtgBATCH 922
mtgBATCH 926

Douglas fir (Pseudotsuga menziesii)
(PSMN)

Permitted timber sizes
Thickness: 33 mm to 84 mm
Width: 68 mm to 248 mm

C35/16
C27/16,
C24/C16, C24/14... Read More about TG1/201804/25rev Derivation of MTG grading machine settings for Douglas fir (IE & GB, C classes).

Home grown timber now and in the future. (2017)
Presentation / Conference Contribution
Ridley-Ellis, D. (2017, November). Home grown timber now and in the future. Presented at WTS British Timber Seminar

Presentation to the wood technology society "British Timber Seminar" at IOM3, November 2017