Study of the deformation properties of 40-year-old hardwood

Abstract

Experimental studies of hardwoods (birch, alder, ash) were conducted under a single short-term axial compression load along the fibers under a rigid test regime. Complete diagrams of the deformation of hardwood wood at the age of 40 years from the beginning of loading to failure (ascending and descending branches) were constructed. The performance of wood samples in 4 deformation areas was analyzed. The main deformation parameters in the precritical (2 areas) and postcritical (2 areas) stages of work were experimentally established: deformation indicators of the end of area I, relative critical deformations (end of area II), relative limiting deformations (end of area III), relative final deformations (end of area IV – destruction). The dependences of the ratio of relative limit deformations on critical ones are proposed.