About the authors
| First name, Middle name, Last name, Scientific degree, Scientific rank, Current position. Full and brief name of the organization, The organization address. | Koryun A. Karapetyan, doctor of technical sciences, head of the laboratory of experimental research, The Institute of Mechanics of the National Academy of Sciences of the Republic of Armenia, Yerevan, Armenia E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it |
| Title of the article | Dependence of creep resistance of fiberglass elements on the initial misalignment of the reinforcement direction |
| Abstract. | The efficiency of using fiber-reinforced polymer composites, in particular fiberglass, in elements of building structures operating under constant long-term loads is determined by the resistance to creep deformation. The latter depends on the degree of fiber orientation in the direction of mechanical stress, which is specified during the design of the product (structure). In case of deviation, i.e. misalignment due to technological reasons, long-term deformations increase. In this regard, it becomes relevant to study the effect of the initial (during manufacture) misalignment on the creep of fiberglass products, which was the purpose of this work. The objectives were to experimentally study the creep of flat and tubular fiberglass samples with different degrees of fiber misalignment, determine the difference in the creep modulus in flat and tubular samples, and formulate design recommendations for reducing the creep of fiberglass products during their operation under load. It has been established that misalignment of the reinforcement direction from that provided by the design leads to a significant increase in creep deformation during tension of fiberglass elements (flat and tubular) compared to the same deformation characteristics of similar elements with the designed reinforcement directions. At the same time, under the action of constant tensile stress, with the same reinforcement angle, the creep resistance during tension of tubular elements is greater than that of flat ones. A design method is proposed for solving the problem of optimal design of fiberglass flat and thin-walled tubular elements, on the deformations of which restrictions are imposed. |
| Keywords. | laminated fiberglass, reinforcement direction misalignment, uniaxial tension, flat and tubular samples, creep deformations, creep modulus during tension |
| For citations: | Karapetyan K.A. Dependence of creep resistance of fiberglass elements on the initial misalignment of the reinforcement direction // Izvestiya KGASU. 2024. №4(70) P.33-41. |
