CREEP OF POLYMER COMPOSITE SHEET PILES WITH A POLYURETHANE MATRIX

Oleg Kornev, Aleksandr Shuvalov, Vladimir Kakusha, Evgeniy Mikhaldykin, Valentin Ushkov

Abstract


Introduction. A progressive method for manufacturing building products from polymer composite materials based on reactive oligomers is the pultrusion method, which allows the production of thin-walled products with an arbitrary profile shape, including sheet piles. The scientific and technical literature contains insufficient information on the creep of glassfilled sheet piles with a polyurethane matrix under different levels and durations of bending loads, which complicates the prediction of the durability of these products. Objective is to establish the dependence of the creep modulus of domestic glass-filled sheet piles with a polyurethane matrix on the magnitude and duration of bending load along and across the pultrusion direction. Methods: the creep of glass-filled polyurethane sheet piles was studied using a lever-type test bench developed by the authors. Results: the influence of stress level (0.2–0.95 Ϭbend) and duration of bending load on the deflection magnitude and creep modulus (GOST 57714–2017) of glass-filled polymer sheet piles with a polyurethane matrix along and across the pultrusion direction was studied. It was shown that no failure of the polyurethane composite sheet pile of grade ShK-200UM occurs within 10,000 hours at stress levels of 0.2 and 0.5 Ϭbend. Failure of 50 % of the composite sheet pile samples with a polyurethane matrix at a stress level of 0.7 Ϭbend occurs after 2,638 and 9,434 hours when tested across and along the pultrusion direction, respectively. By extrapolating the experimental “stress-strain” dependencies, the creep of polyurethane composite sheet piles for a period of up to 50 years was predicted.

Keywords


polyurethane sheet pile; pultrusion; deformation; deflection; creep modulus; stress level

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References


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