Specimen designs for accurate tensile testing of unidirectional composite laminates

Fazlali, Babak; Upadhyay, Shailee; Ashokbhai Ashodia, Sagar; Mesquita, Francisco; Lomov, Stepan V.; Carvelli, Valter; Swolfs, Yentl

doi:10.1016/j.compositesa.2023.107799

Cited by 6 publications

(1 citation statement)

References 26 publications

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“…According to the classical laminate theory (CLT) [ 13 , 14 , 15 ], the modulus in the transverse direction is mainly determined by the modulus of the resin matrix and the fiber volume fraction. Among them, the fiber volume fraction is achieved by adjusting the thickness of the resin film and the fiber yarn bundle, and the resin modulus is controlled by the molecular structure design of different soft and hard segments and crosslinking density in the material formulation.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Mechanical Properties of Flexible Prepreg Resin with High Strength and Low Creep

Sun,

Mei,

Huang

et al. 2024

Polymers

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In this study, aiming at the problem of low strength and high creep caused by medium–low modulus flexible resin based on the formulation design idea of high-molecular-weight epoxy resin (E12)-reinforced flexible epoxy-terminated urethane resin (EUR), a flexible epoxy prepreg resin with high strength and low bending creep was prepared to be suitable for hot melt processing technology. Flexible EUR was synthesized by grafting flexible polyurethane segments onto the epoxy side chain by urethane bonding. By adjusting the ratio of E12 and EUR, the effects of different ratios of the two components on the mechanical properties and viscoelasticity of the resin were systematically studied with dicyandiamide as the latent curing system. Research has found that when the E12 content is between 20%wt and 40%wt, the resin system has the best coating viscosity at 65 °C to 85 °C. The molecular weight and the content of aromatic heterocyclic groups of the resin determine the strength and creep behavior of the resin. When the content of E12 in the system is less than 50%wt, modulus and strength increase linearly, but after more than 50%wt E12 content, the modulus is almost unchanged and the strength begins to decrease. By increasing the content of E12 in the resin, the creep behavior of the resin is greatly reduced. When the content of E12 increases to 50%wt, the bending creep is the lowest.

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Section: Introductionmentioning

confidence: 99%