English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The use of resonant frequency is presently one of the most used non-destructive testing (NDT) methods to predict the mechanical properties of sawn timber. In most cases, only the first vibration mode is used to estimate the static modulus of elasticity (MOE S ). The use of other vibration modes (overtones) can improve the predictive capacity of this NDT. In this study, the dynamic modulus of elasticity (MOE dyn ) obtained from the fundamental flexural resonant frequency and overtones of 38 structural size samples (2000 × 100 × 70 mm 3 ) of  Pinus sylvestris  were analysed. The study was complemented with 16 small size samples (1000 × 20 × 8.7 mm 3 ) of the same species to know the shear effect in samples with a very high length-to-depth ratio. For the structural size samples, a 6% decrease in the MOE dyn  was detected each time the vibration mode increased. Using the second or third vibration mode offered lower errors in the prediction of the MOE S  than the fundamental resonant frequency. The lowest MOE S  prediction errors were obtained combining various vibration modes through power regression. This regression turned out to be a simple alternative to avoid the shear effect in the calculation of the MOE dyn .

Dynamic modulus of elasticity in flexural vibration tests of Pinus sylvestris sawn timber obtained with fundamental resonant frequency and overtones