Abstract
Tests on birch and aspen with different directions of cutting samples relative to the location of the fibers were performed. The tests were carried out on the installation with a Split Hopkinson Pressure Bar (SHPB) that implements the Kolsky method. The angles between the direction of application of the load and the direction of the location of the fiberswere 0°, 30°, 45°, 60° and 90°. The experiments were carried out at temperatures of −40 °C, +20 °C and +60 °C. The strain rate was of the order of 103 s−1. Dynamic stress-strain diagrams were obtained. The greatest steepness of the load branches and the greatest destructive stresses were observed for samples with a cutting angle of 0°. The smallest values of these parameters are noted at 90° cutting angle. It is noted that as the temperature of the test decreases, the magnitude of the stresses at which the specimens are destroyed increases for all the cutting angles of the specimens. There is a tendency to a decrease in the diagrams at a temperature of +60 °C compared with the results at room temperature for almost all tested wood batches. At the same time, both the modules of the loading and unloading branches and the limiting (destructive) stresses decrease.
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Acknowledgements
Dynamic tests of birch were performed with partial financial support from the RFBR (grant 18-08-00808). Research of aspen behavior was supported by the grant from the Government of the Russian Federation (contract No. 14.Y26.31.0031)
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Bragov, A., Gonov, M., Konstantinov, A., Lomunov, A., Yuzhina, T. (2020). Deformation and Destruction at Deformation Rate of Order 103 s−1 in Wood of Hardwood Trees. In: Abali, B., Giorgio, I. (eds) Developments and Novel Approaches in Nonlinear Solid Body Mechanics. Advanced Structured Materials, vol 130. Springer, Cham. https://doi.org/10.1007/978-3-030-50460-1_26
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