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Abstract <p>Pultruded glass-fiber composites have been widely used in road infrastructures and in construction but their strength characteristics under complex stress state at different temperatures have not been determined, which complicates their further use. This work is devoted to the determination of static strength and stiffness of pultruded glass-fiber composites under normal and shear stresses (induced by simultaneous axial loading and torsion of specimens) for three different temperatures. The paper reveals the methodological aspects of testing under multiaxial loading; in particular, it analyzes different variants of specimen tabs. The experimental part included uniaxial tensile, torsion, compression tests, as well as multiaxial combined tensile and compression tests with torsion at normal, elevated, and low temperatures. Sensitivity of pultruded glass-fiber composites to complex stress state is revealed. Failure envelopes were built after axial and multiaxial testing at various temperatures. A failure criterion of the fourth order is proposed. The displacement and strain fields of the tubular specimens were analyzed using the VIC 3D at the chosen loadings and temperatures. The displacement fields were similar on the surfaces of the specimens, which indicates correct and uniform loading. The characteristic fractures are presented. The cracks on the specimens were different and correspond to the respective loading parameters and temperatures. This data allows us to predict the failure of the pultruded glass-fiber composites under complex loadings and different temperatures, which is necessary for the use of such materials.</p>

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The Static Strength of Pultruded Fiberglass Composites at Elevated and Reduced Temperatures under a Complex-Stress State

  • 期刊论文

  • 发表日期：

    2025年1月1日

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  • O. A. Staroverov,
  • A. M. Kuchukov,
  • V. A. Mel’nikova,
  • A. S. Elkin,
  • I. V. Sergeichev

摘要

Abstract

Pultruded glass-fiber composites have been widely used in road infrastructures and in construction but their strength characteristics under complex stress state at different temperatures have not been determined, which complicates their further use. This work is devoted to the determination of static strength and stiffness of pultruded glass-fiber composites under normal and shear stresses (induced by simultaneous axial loading and torsion of specimens) for three different temperatures. The paper reveals the methodological aspects of testing under multiaxial loading; in particular, it analyzes different variants of specimen tabs. The experimental part included uniaxial tensile, torsion, compression tests, as well as multiaxial combined tensile and compression tests with torsion at normal, elevated, and low temperatures. Sensitivity of pultruded glass-fiber composites to complex stress state is revealed. Failure envelopes were built after axial and multiaxial testing at various temperatures. A failure criterion of the fourth order is proposed. The displacement and strain fields of the tubular specimens were analyzed using the VIC 3D at the chosen loadings and temperatures. The displacement fields were similar on the surfaces of the specimens, which indicates correct and uniform loading. The characteristic fractures are presented. The cracks on the specimens were different and correspond to the respective loading parameters and temperatures. This data allows us to predict the failure of the pultruded glass-fiber composites under complex loadings and different temperatures, which is necessary for the use of such materials.