The influence of cyclic loading on ultimate bending strength of massive and laminated beech wood

In this article we deal with investigation a influence of cyclic loading massive and laminated beech wood at various material thicknesses on ultimate bending strength sigma p ", during bending in radial direction. For identification of monitored characteristic we used static bending test with three-point loading. Monitored characteristic was detected on testing samples which weren't cyclic loaded and our results were compared with other results obtained from samples which were cyclic loaded. The results of this work show that influence of cyclic loading on values of ultimate bending strength for massive and laminated wood isn't sign (cant. Thickness influence is significant factor at both monitored material types; the results show that thickness increasing causes the decreasing values of ultimate bending strength. We think that ultimate bending strength decreasing isn't caused by material thickness but different material lengths. The rising of material length is mostly represented by inhomogeneous wood properties.