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Making the grade and maximising the opportunities. (2016)
Presentation / Conference Contribution
Ridley-Ellis, D. (2016, April). Making the grade and maximising the opportunities. Presented at Institute of Chartered Foresters 2016 National Conference “The Timber Supply Chain – Dynamics and Opportunities”

Institute of Chartered Foresters National Conference 2016

Invited presentation covering:
A quick explanation of key properties of wood, relevant to construction
The extent of variation in these properties, between and within species – and the... Read More about Making the grade and maximising the opportunities..

The Forum (Wood). (2015)
Digital Artefact
Ridley-Ellis, D. (2015). The Forum (Wood)

Contributor to pre-recorded BBC World Service programme.

Is our attitude to wood changing? In Africa it’s a still the dominant fuel for daily survival and in Canada an architect is designing wooden high rise buildings. To discuss wood, architect M... Read More about The Forum (Wood)..

Potential for estimating the age of instruments by characterisation of wood properties via acoustics. (2014)
Presentation / Conference Contribution
Ridley-Ellis, D., & Popescu, C.-M. (2014, September). Potential for estimating the age of instruments by characterisation of wood properties via acoustics. Presented at WoodMusiCK (FP1302) conference ‘multidisciplinary approach to wooden musical instrument identification’

The performance of musical instruments is sensitive to several wood properties that are affected by aging. These wood properties also change with temperature and humidity in ways that interact with (and change as a result of) aging processes. This of... Read More about Potential for estimating the age of instruments by characterisation of wood properties via acoustics..

Strength class of minor conifer species, as estimated from log acoustic measurements, small-clear data and knowledge of wood property variation (2014)
Presentation / Conference Contribution
Gil-Moreno, D., Ridley-Ellis, D., & McLean, J. P. (2014, May). Strength class of minor conifer species, as estimated from log acoustic measurements, small-clear data and knowledge of wood property variation. Presented at Experimental Research with Timber: Cost action FP1004

It is well known that wood properties vary from species to species. Additionally, trees grow wood in response to their requirement to grow in a certain environment. Therefore, timber properties also vary by region, by forest practice, and by the chan... Read More about Strength class of minor conifer species, as estimated from log acoustic measurements, small-clear data and knowledge of wood property variation.

Stiffness changes during low temperature thermal treatment of Scots pine, assessed by acoustic NDT (2014)
Presentation / Conference Contribution
Ridley-Ellis, D., Popescu, C.-M., Keating, B. A., Popescu, M.-C., & Hill, C. A. S. (2014, March). Stiffness changes during low temperature thermal treatment of Scots pine, assessed by acoustic NDT

The change, over time, in density, longitudinal modulus of elasticity, shear modulus and chemical structure of Scots pine (Pinus sylvestris) under thermal treatment (110, 120 and 140 C) was evaluated. The determinations of the specific changes were c... Read More about Stiffness changes during low temperature thermal treatment of Scots pine, assessed by acoustic NDT.

Adding value to the Forest through research. (2014)
Presentation / Conference Contribution
Ridley-Ellis, D. (2014, March). Adding value to the Forest through research. Presented at Wood Products Innovation Gateway closing event

Presentation at the closing event of the "Wood Products Innovation Gateway"

Mechanical and physical properties of thermally modified Scots pine wood in high pressure reactor under saturated steam at 120, 150 and 180°C (2013)
Journal Article
Rautkari, L., Honkanen, J., Hill, C. A. S., Ridley-Ellis, D., & Hughes, M. (2014). Mechanical and physical properties of thermally modified Scots pine wood in high pressure reactor under saturated steam at 120, 150 and 180°C. European Journal of Wood and Wood Products, 72, 33-41. https://doi.org/10.1007/s00107-013-0749-5

Scots pine sapwood and heartwood were thermally modified under saturated steam at 120, 150 and 180 °C in a high pressure reactor. Mechanical properties such as dynamic and static modulus of elasticity (MOE), static modulus of rupture (MOR), Brinell h... Read More about Mechanical and physical properties of thermally modified Scots pine wood in high pressure reactor under saturated steam at 120, 150 and 180°C.

Determination of shear strength of timber joists by torsion testing. (2009)
Presentation / Conference Contribution
Khokhar, A. M., Zhang, H., & Ridley-Ellis, D. (2009, October). Determination of shear strength of timber joists by torsion testing

This paper presents an experimental investigation in which the torsion testing approach was employed to evaluate the shear strength of Sitka spruce and Norway spruce joists. Rectangular
structural size specimens of lengths ranging from 1.0 m to 3.6... Read More about Determination of shear strength of timber joists by torsion testing..

Random acts of elasticity: MoE, G and EN408. (2009)
Presentation / Conference Contribution
Ridley-Ellis, D., Moore, J., & Khokhar, A. M. (2009, April). Random acts of elasticity: MoE, G and EN408

The paper examines the variation in modulus of elasticity (MoE) and shear modulus (G) within sawn timber and the implications for testing timber in accordance with EN408:2003. A combination of mechanical testing and simple analytical modelling is us... Read More about Random acts of elasticity: MoE, G and EN408..

Determining the Shear Modulus of Sitka Spruce from Torsion Tests (2008)
Journal Article
Khokhar, A. M., Zhang, H., Ridley-Ellis, D., & Moore, J. (2008). Determining the Shear Modulus of Sitka Spruce from Torsion Tests. Timber Engineering,

This paper presents details of the experimental method, and preliminary results from, a series of torsion tests undertaken to evaluate the shear modulus of Sitka spruce (Picea sitchensis) timber. Direct torsion tests were used to determine the variat... Read More about Determining the Shear Modulus of Sitka Spruce from Torsion Tests.

Online learning for the forest and timber industries. (2008)
Presentation / Conference Contribution
Ridley-Ellis, D., Nolte, S., & Condon, P. (2008, June). Online learning for the forest and timber industries

Online learning offers advantages for all levels of training and development in the timber industries, from new recruits at technician level to chartered professionals. Learners and employers both value the flexibility it affords, while educators val... Read More about Online learning for the forest and timber industries..

Dynamic Performance of Multi-Webbed Engineered Timber Joists (2008)
Journal Article
Bahadori-Jahromi, A., & Ridley-Ellis, D. (2008). Dynamic Performance of Multi-Webbed Engineered Timber Joists. Journal of the Institute of Wood Science, 18(2), 87-93. https://doi.org/10.1179/wsc.2008.18.2.87

The introduction of engineered beams offered longer span, lower cost joists in comparison to traditional solid timber sections; however, vibration criteria in the design codes may significantly reduce the permissible span of joists for domestic const... Read More about Dynamic Performance of Multi-Webbed Engineered Timber Joists.

Strength grading and the end user – lessons from the SIRT project at Napier University (2008)
Presentation / Conference Contribution
Ridley-Ellis, D., Moore, J., & Lyon, A. J. (2008, October). Strength grading and the end user – lessons from the SIRT project at Napier University. Presented at Conference COST Action E53 “End user’s needs for wood material and products”

The paper reviews the research that has been undertaken by the Strategic Integrated Research in Timber (SIRT) project at Napier University, with reference to the technologies, techniques and approaches required to grade the UK’s timber resource accor... Read More about Strength grading and the end user – lessons from the SIRT project at Napier University.

3D lattice model for post-yield and fracture behaviour of timber. (2008)
Journal Article
Reichert, T., & Ridley-Ellis, D. (2008). 3D lattice model for post-yield and fracture behaviour of timber. Timber Engineering,

The paper describes the development of a bespoke Finite Element program to model timber with a three dimensional lattice of single spring elements. These springs mimic meso-scale timber behaviour, namely the crushing and separation of fibre bunches b... Read More about 3D lattice model for post-yield and fracture behaviour of timber..

Determining the Shear Modulus of Sitka Spruce from Torsion Tests (2008)
Presentation / Conference Contribution
Khokhar, A., Zhang, H., Ridley-Ellis, D., & Moore, J. (2008, June). Determining the Shear Modulus of Sitka Spruce from Torsion Tests. Presented at WCTE2008:10th World Conference on Timber Engineering

This paper presents details of the experimental method, and preliminary results from, a series of torsion tests undertaken to evaluate the shear modulus of Sitka spruce (Picea sitchensis) timber. Direct torsion tests were used to determine the variat... Read More about Determining the Shear Modulus of Sitka Spruce from Torsion Tests.

Geometric Non-Linear Behaviour of Single Shear Bolted Joints. (2006)
Journal Article
Reichert, T., & Ridley-Ellis, D. (2006). Geometric Non-Linear Behaviour of Single Shear Bolted Joints. Timber Engineering,

Findings are presented of the first stage of an investigation of second-order effects that influence the resistance and stiffness of single shear bolted joints. These effects develop as a result of joint deformation and the rotation of all, or part,... Read More about Geometric Non-Linear Behaviour of Single Shear Bolted Joints..

Timber Plate Dynamics with Space-Time Finite Element (2006)
Journal Article
Zhang, H., Ridley-Ellis, D., & Hapca, A. I. (2006). Timber Plate Dynamics with Space-Time Finite Element. Timber Engineering,

A new space-time finite element formulation for dynamic analysis of timber plates is presented. The method is based on an unconventional Hamilton variational principle and a special technique in time domain interpolation is employed. For the simple c... Read More about Timber Plate Dynamics with Space-Time Finite Element.