Determination of failure curve of transversely isotropic fiber composite pine wood (Pinus sylvestris) by the help of experimental studies

In this study, the failure and yield curves for pinus sylvestris that is assumed as a transversely isotropic fiber composite metarial were determined experimentaly using strain gages. For this purpose; tensile, compression and torsion tests were performed on specimens prepared according to Turkish standarts and s - e (normal stress-normal strain), t -g (shear stress-shear strain) curves were plotted. From these plottings the yielding stresses were determined by intersecting the curve and a straight line having an inclination of 5% less than the slope of the linear part the curve. By using these data, approximate yield and failure curves were drawn in the s1 -s2 principal plane. Key Words : Scotch pine (Pinus sylvestris), transversely isotropic, yield curve, failure curve, tensile-compression-torsion tests.