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20 results

Some thresholds for grading British grown spruce to optimised strength classes using longitudinal resonance

Conference Proceeding
Ridley-Ellis, D., Adams, S., & Lehneke, S. (2018)
Some thresholds for grading British grown spruce to optimised strength classes using longitudinal resonance
The main commercial species in the UK and Ireland is Sitka spruce (Picea sitchensis), which is graded in combination with a small amount of Norway spruce (P. abies). It is typ...

Thinking beyond the usual strength grades – with examples of British spruce and larch

Conference Proceeding
Ridley-Ellis, D., Adams, S., & Lehneke, S. (2016)
Thinking beyond the usual strength grades – with examples of British spruce and larch. In Proceedings of the World Conference on Timber Engineering (WCTE 2016), August 22-25, 2016, Vienna, Austria, Eds.: J. Eberhardsteiner, W. Winter, A. Fadai, M. Pöll, Publisher: Vienna University of Technology
This paper summarises the processes and normative requirements involved in grading of structural timber, and outlines a number of areas in which matters may be improved, so as...

Using the right Modulus of Elasticity to get the best grades out of softwood timber species in Great Britain

Conference Proceeding
Gil-Moreno, D., Ridley-Ellis, D., & McLean, P. (2016)
Using the right Modulus of Elasticity to get the best grades out of softwood timber species in Great Britain. In WCTE 2016 World Conference on Timber Engineering e-book Full Papers
The correct characterisation of modulus of elasticity in bending is fundamental for timber grading, especially when that property limits the allocation to a strength class. Th...

Analysis of acoustical properties of wood and mode identification by sample scanning in the very near field

Conference Proceeding
Pantelić, F., Šumarac Pavlović, D., Mijić, M., & Ridley-Ellis, D. (2016)
Analysis of acoustical properties of wood and mode identification by sample scanning in the very near field. In Zbornik apstrakata i program 60.konferencije ETRAN, Zlatibor
It is possible to achieve a good visualization of vibration modes by microphone scanning of a vibration excited sample of wood in very near field. The experimental settings, s...

Comparing usefulness of acoustic measurements on standing trees for segregation by timber stiffness.

Conference Proceeding
Gil-Moreno, D., & Ridley-Ellis, D. (2015)
Comparing usefulness of acoustic measurements on standing trees for segregation by timber stiffness. In R. J. Ross, R. Gonçalves, & X. Wang (Eds.), Proceedings: 19th International Nondestructive Testing and Evaluation of Wood Symposium, 378-385
The paper presents a comparison of standard procedures to measure acoustic stiffness of standing trees and logs. The aim is to see how useful they are for predicting the prope...

Strength grading of sawn timber in Europe - an explanation for engineers.

Conference Proceeding
Ridley-Ellis, D., Stapel, P. & Baño, V. (2015)
Strength grading of sawn timber in Europe - an explanation for engineers

Potential for estimating the age of instruments by characterisation of wood properties via acoustics.

Conference Proceeding
Ridley-Ellis, D., & Popescu, C. (2014)
Potential for estimating the age of instruments by characterisation of wood properties via acoustics
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 w...

Strength class of minor conifer species, as estimated from log acoustic measurements, small-clear data and knowledge of wood property variation

Conference Proceeding
Gil-Moreno, D., Ridley-Ellis, D., & McLean, J. P. (2014)
Strength class of minor conifer species, as estimated from log acoustic measurements, small-clear data and knowledge of wood property variation. In K. Schober (Ed.), COST Action FP1004 "Experimental Research with Timber", (214-218
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,...

Stiffness changes during low temperature thermal treatment of Scots pine, assessed by acoustic NDT

Conference Proceeding
Ridley-Ellis, D., Popescu, C., Keating, B. A., Popescu, M., & Hill, C. A. S. (2014)
Stiffness changes during low temperature thermal treatment of Scots pine, assessed by acoustic NDT. In L. Nunes, D. Jones, C. A. S. Hill, & H. Militz (Eds.), Proceedings of the 7th European Conference on Wood Modification
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 ...

The shear strength and failure modes of timber joists obtained from the torsion test method.

Conference Proceeding
Khokhar, A. M., Zhang, H., & Ridley-Ellis, D. (2010)
The shear strength and failure modes of timber joists obtained from the torsion test method. In A. Ceccotti (Ed.), 11th World Conference on Timber Engineering 2010 (WTCTE 2010), (3509-3516
This paper presents details of the experimental method and test results from a series of torsion tests undertaken to evaluate the shear strength of timber joists. The failure...