%0 Journal Article %T The role of the limit of proportionality in studying the properties of composite materials %A Zobov, S.. %A Chernikov, E.A. %K ultimate strength, elastic limit, proportional limit, the application load, load %J Actual directions of scientific researches of the XXI century: theory and practice %D 2014 %N 2 %P 5 %I FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov