Dynamic fatigue tests of hardwoods

Orbán, Gábor és Kánnár, Antal (2024) Dynamic fatigue tests of hardwoods. In: 11TH HARDWOOD CONFERENCE PROCEEDINGS : Sopron, Hungary, 30-31 May 2024. Hardwood conference proceedings . Soproni Egyetem Kiadó, Sopron, pp. 163-167. ISBN 9789633345184

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Absztrakt (kivonat)

Static testing of the parameters of wood as a structural material has been practised for at least 100 years. In the meantime, investigating repeated dynamic impacts and loads required significant improvements in measurement techniques. These cyclic fatigue tests became widespread for assessing metals, rubber and plastics, rather than wood. This study aims to examine the dynamic strength characteristics of wood as an elastic material. This will provide data for designing wooden structures exposed to dynamic loads, like wooden bridges, lookout towers and possibly innovative machine parts. Based on the available literature, this appears to be an extensive, little researched topic of investigation. The goals of the research is to create Wöhler curves for hardwoods, which shows the fatigue limits of wood as a function of the applied stresses. This involves performing cyclic tensile tests with maximum loading levels of 60, 70, 80 and 90 % of the static tensile strength. At least three specimens are tested at each load level for calculating the average fatigue limit. Tests are currently underway. Completed tests yielded a fatigue curve for oak. Results show that oak material resists fatigue testing well, even at high stress levels. It can withstand hundreds of thousands of cycles at stress levels as high as 80 % of the static tensile strength.

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