Determination of shear stresses in the measurement area of a modified wood sample

Abstract The purpose of the experiment was to determine distribution shear stresses in measurement area a natural and modified wood sample. Previous tests conducted on typical Iosipescu specimen have shown that complex stress state exists at bottom notch. With transverse loading samples, flexure occurs normal arise from bending moment thus fibers are deformed. For investigations oriented shear, with stretching, compression, special prepared which differed by notch geometry specimen. A new test machine is described article, equipped holders perform conditions. Crack patterns recorded for presented. all tests, numerical finite element model simulations were performed obtain distributions inside specimens. calculated visualized as contour line projections wood. Transverse strength values sample found exceed magnitude previously published ASTM D1037-87 results. results proved properties anisotropic materials can be assessed great accuracy. This very important engineering applications.