Aspects of reproducibility and stability for partial cure of epoxy matrix resin

Müller, M.; Winkler, Anja; Gude, Μaik; Jäger, Hubert

doi:10.1002/app.48342

Cited by 7 publications

(3 citation statements)

References 45 publications

(140 reference statements)

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“…5 (a-c) representative true stress-true strain curves of the performed tensile tests are shown. After an initially linear stress increase, which is associated with the elastic part of deformation, a maximum is reached followed by a drop of the measured stress values, which is probably related to intrinsic strain softening [12,13]. Both, the maximum and softening can be attributed to initiation of plastic flow.…”

Section: T Tensile and Compr Ensile And Compressi Essiv Ve T E Tests Estsmentioning

confidence: 95%

Qualification of an Epoxy Resin System for Use in Secondarily Formable CFRP Rebars

Müller-Pabel¹,

Wohlfahrt²,

Geller³

et al. 2021

Esaform 2021

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The use of reinforcing bars has been known for more than 150 years in construction sector, in order to compensate the limited tensile strength of concrete. Steel is the most widespread and standardized rebar material. As industry targets a reduction of resource consumption and increased freedom of design, novel materials come into the scope of current research efforts. In this context, carbon fiber reinforced polymers (CFRP) have become a promising candidate for rebar materials as they offer excellent corrosion resistance and mechanical properties. Their use enables significant reduction of concrete cover in future buildings and cost-efficient maintenance of bridges. The resin system used for manufacturing of CFRP rebars dictates possible applications. Thermoplastic polymers offer the advantage of formability in a molten state. On the other hand, they provide limited heat and fire resistance, what hinders further industrialization. In contrast, thermosets deliver high mechanical and thermal properties due to their polymeric network structure. This is also the reason for their restricted formability after gelation has occurred. However, it is known that epoxy resins may sustain substantial plastic deformation when being deformed at elevated temperatures and in a partial cure state. In this work, a commercially available resin system is selected and qualified for potential use in thermoset-based CFRP rebars. Based on the resin characterization comprising reaction kinetics as well as tensile and compressive tests at partial cure, general guidelines and limits for secondary forming are derived. The feasibility is demonstrated by bending tests on CFRP stripes with varied fiber orientation.

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Section: T Tensile and Compr Ensile And Compressi Essiv Ve T E Tests Estsmentioning

confidence: 95%

Qualification of an Epoxy Resin System for Use in Secondarily Formable CFRP Rebars

Müller-Pabel¹,

Wohlfahrt²,

Geller³

et al. 2021

Esaform 2021

Self Cite

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“…The above described processstructure model considers the connections between the individual phenomena occurring during the consolidation as well as the interconnections between material and structural properties and the process parameters. The knowledge gained in this context has a decisive influence on process and tool design [6].…”

Section: Fig 1 Process-structure Modelmentioning

confidence: 99%

“…Manufacturers often use trial-and-error methods to determine the production parameters for specific material systems and products. Such an approach is therefore very costly and timeconsuming [6,7].…”

Section: Introductionmentioning

confidence: 99%

Experimental-numerical validation of the curing reaction of snap-cure polymer systems for component families of small batch sizes and high diversity

et al. 2021

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The efficient production of component families of small batch sizes and high diversity requires numerical analyses of manufacturing processes, especially for complex shaped components made of fibre-reinforced thermosets. In the case of snap-cure systems, curing takes place in a very short time and the exothermic reaction can lead to accumulation of heat and inhomogeneous curing. In order to achieve a reliable production of composite components, a numerical analysis of the curing process is necessary. Especially the practice-oriented and timesaving determination of the thermal conditions during the curing process is essential for the industrial application. Therefore, an experimental-numerical approach to predict the curing process was presented, which includes the analytical as well as the experimental determination of numerous thermal and thermochemical material parameters and models for snap-cure thermosets. The experimentally determined material parameters and models for the description of the material and structural behaviour are validated and evaluated by numerical simulations. In addition, the developed finite element models were used for the manufacturing process design of a complex component demonstrator.

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Measuring and understanding cure-dependent viscoelastic properties of epoxy resin: A review

Müller-Pabel

Agudo²,

Gude

2022

Polymer Testing

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Aspects of reproducibility and stability for partial cure of epoxy matrix resin

Cited by 7 publications

References 45 publications

Qualification of an Epoxy Resin System for Use in Secondarily Formable CFRP Rebars

Qualification of an Epoxy Resin System for Use in Secondarily Formable CFRP Rebars

Experimental-numerical validation of the curing reaction of snap-cure polymer systems for component families of small batch sizes and high diversity

Measuring and understanding cure-dependent viscoelastic properties of epoxy resin: A review

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