Solids

Temporal dependence of fracture of biopolymer films under tension

Yu. V. Petrov^a, A. A. Chevrychkina^b, V. V. Kodolova-Chukhontseva^c, K. A. Kolbe<sup>c

a</sup> Saint Petersburg State University
^b Institute of Problems of Mechanical Engineering, Russian Academy of Sciences, St. Petersburg
^c Institute of Macromolecular Compounds, Russian Academy of Sciences, St. Petersburg

Abstract: The temporal dependence of the effects of irreversible deformation and fracture of biopolymer films made of chitosan in the range of tensile strain rates of 1.6 $\cdot$ 10$^{-3}$–440 1/s is investigated. It is shown that the temporal effect appears in a significant change in the fracture time, fracture deformation and material toughness with a change in the strain rate. Temporal effect is insignificant for the yield strength and elastic modulus: they are changed little with a change in the strain rate. The temporal dependence of the material toughness and fracture time on the loading rate is described using the structural-temporal approach.

Keywords: strength, fracture, temporal effects, chitosan films.

Received: 11.08.2025
Revised: 23.09.2025
Accepted: 29.09.2025

DOI: 10.61011/JTF.2025.11.61596.403-24

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