Creep behavior of polyetherimide semipreg and epoxy prepreg composites: Structure vs. property relationship

Reis, Adriano Gonçalves dos; Monticelli, Francisco Maciel; Neves, Roberta Motta; Santos, Luis Felipe de Paula; Botelho, Edson Cocchieri; Ornaghi, Heitor Luiz

doi:10.1177/0021998320927774

Cited by 20 publications

(4 citation statements)

References 28 publications

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“…There is no third-order creep in the curve. Third-order creep occurs only at a high stress value or at this stress level for a long time [ 39 , 40 ]. As expected, the increase in high-molecular-weight epoxy content weakens the bending creep behavior of the resin.…”

Section: Resultsmentioning

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: Resultsmentioning

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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“…The Kelvin-Voigt model, Maxwell model, Burgers model, and Findley power-law model have been widely used to describe the creep behavior of composite materials. [34,35,[42][43][44] Among them, the Findley power-law model is favored by scholars due to the creep strain of composites with time under a fixed load can be accurately predicted by it. [44,45] However, the Findley powerlaw model does not take into account the effect of environmental factors on creep.…”

Section: Creep Constitutive Modelmentioning

confidence: 99%

Creep properties and damage mechanism of molded glass fiber reinforced plastic

Liu

et al. 2023

Polymer Composites

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Glass fiber reinforced plastic (GFRP) has become one of the most commonly used materials in the structure of aero engines in the last decades. In this study, GFRP was fabricated by molding with phenolic resin as the matrix. Specimens were prepared along horizontal and vertical directions. Fiber distribution, tensile properties, long‐term creep performance, and damage mechanism were systematically investigated. Experimental results shows that horizontal specimens have better tensile properties, lower viscoelasticity, and excellent creep resistance. The fibers inside the cylindrical material exhibit a 3D core‐shell morphology with transverse isotropy in the core region. Load is carried by the fibers and the damage is in the form of fiber fracture and pull‐out in horizontal specimens. Random distribution and interweaving leads to double fracture sections of fibers. Load is carried by the interface and resin, and the damage is in the form of fiber pull‐out laterally and interfacial debonding in vertical specimens. High viscoelasticity of the resin and the weak interfacial bonding ability lead to large creep deformation of vertical specimens. In addition, the creep strain under different loads can be accurately predicted by Modified Time Hardening model.

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“…They reported as temperature exceeded T g , a remarkable increase in strain is observed. Reis et al [15] investigated the creep behavior of epoxy matrix composite in glassy, glass transition, and elastomeric regions. They concluded the higher deformation as temperature increases.…”

Section: Introductionmentioning

confidence: 99%

Stress Dependency of Creep Response for Glass/Epoxy Composite at Nonlinear and Linear Viscoelastic Behavior

Nosrati

Zabett

Sahebian

2022

International Journal of Polymer Science

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This research is aimed at comparing the stress dependency of creep viscoelastic behavior for glass/epoxy composite and neat epoxy close to the glass transition temperature and room temperature. Long-term creep performance of quasi-unidirectional composites and quasi-isotropic stacking sequence composites is modeled based on the time-stress superposition principle (TSSP). Linearity and nonlinearity of viscoelastic behavior and stress-dependence correlations were investigated for quasi-isotropic stacking sequence composite at 25°C and 50°C (near the glass transition temperature). Stress dependency of creep stages (primary, secondary, and tertiary) of neat epoxy was evaluated at this range of temperature. The prediction results of composite at room temperature show that the raising of the stress levels leads to the acceleration of viscoelastic strain values, but the creep compliance does not present any dependency. Besides, the reduction of viscoelastic ability is realized by measuring less amount of creep compliance at higher stress level in the glass transition temperature. These observations confirmed the linearity and nonlinearity of viscoelastic behavior at room and glass transition temperature, respectively. Similar results of neat epoxy revealed that the increase in the stress level accelerates the strain values at room temperature and decreases the creep resistance at glass transition temperature. Failure morphologies of epoxy sample fractured at room temperature are included scarp, cusp, and river line; however, close to the glass transition temperature, more expansive mirror zones appeared. Fiber architecture significantly affected the secondary stage regime by providing load-bearing ability. Thereby, creep rate reduction and enhancement of creep lifetime and creep resistance would be reported using unidirectional reinforcing in contrast to those of the multilayer sequence one.

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Creep behavior of polyetherimide semipreg and epoxy prepreg composites: Structure vs. property relationship

Cited by 20 publications

References 28 publications

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

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

Creep properties and damage mechanism of molded glass fiber reinforced plastic

Stress Dependency of Creep Response for Glass/Epoxy Composite at Nonlinear and Linear Viscoelastic Behavior

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