Thermo-mechanical behaviour of composite moulding compounds at elevated temperatures

Gombos, Zoltán; McCutchion, Paul; Savage, Luke

doi:10.1016/j.compositesb.2019.106921

Cited by 14 publications

(9 citation statements)

References 33 publications

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“…Even if the peak in tan δ curve is an extended parameter for defining T g values, [42][43][44][45] many authors prefer to employ other parameters as the peak value on E" curve 18 or inflection point of E' curve. 46 Startsev et al 47 decline the use of tan δ peak as the universal marker of T g by arguing that significant discrepancies appear between the maximum values on tan δ curve, peaks on E" curve and inflection point on E' curve, when all these parameters reveal the same type of molecular mobility. 47 Instead, it is proposed to use the minimum point of the temperature derivative of the storage modulus (dE'/dT) curve, based on the physical meaning that this point represents, that is, the maximum rate of the α-transition.…”

Section: Dynamic Mechanical Analysismentioning

confidence: 99%

Effects of hygrothermal aging on the thermomechanical properties of a carbon fiber reinforced epoxy sheet molding compound: An experimental research

Zulueta

Burgoa

Martinez³

2020

J of Applied Polymer Sci

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Carbon fiber sheet molding compounds (C-SMCs) are discontinuous fiber reinforced composite materials. Among them, epoxy-based C-SMCs are becoming relevant materials due to their high thermomechanical performance and better formability than continuous fiber reinforced composites. The thermomechanical performance of epoxy resins and epoxy based continuous carbon fiber composites have shown to be influenced by hygrothermal aging. In this work, this influence is studied for an epoxy-based C-SMC. Epoxy-based C-SMC samples were hygrothermally aged by means of accelerated conditioning, exposing them to 65% relative humidity, and 80 C in a climatic chamber. The equilibrium moisture content, as well as the moisture diffusion coefficient has been determined. The thermomechanical properties of epoxy C-SMC have been analyzed by dynamic mechanical analysis, tensile, 3-point bending, and short beam tests in dry and aged samples. The results showed that epoxy C-SMC is affected by hygrothermal aging in the cases of moisture intake and its effects on T g value, but interestingly, the hygrothermal aging did not generate any degradation effects in the mechanical response of epoxy C-SMC.

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Section: Dynamic Mechanical Analysismentioning

confidence: 99%

Effects of hygrothermal aging on the thermomechanical properties of a carbon fiber reinforced epoxy sheet molding compound: An experimental research

Zulueta

Burgoa

Martinez³

2020

J of Applied Polymer Sci

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“…Most aircraft composite parts are manufactured using high temperature curing resins and thus, elevated mold temperatures are inevitable. [ 6 ] In industrial practices, composite parts are manufactured at elevated mold temperatures to reduce process cycle times. With an increase in temperature, resin undergoes chemical change predominantly through free radical polymerization and forms a networked 3D structure with exothermal heat.…”

Section: Introductionmentioning

confidence: 99%

Design of effective injection strategy and operable cure window for an aircraft wing flap composite part using neat resin characterization and multi‐physics process simulation

2022

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A methodology using neat resin characterization and multi‐physics process simulation was proposed to develop a resin transfer molding (RTM) process for an aircraft wing flap composite part. Initially, RTM6 resin was thermally characterized using differential scanning calorimetry and curing kinetics was modeled using Kamal and Sourour model. A multi‐physics approach was employed to simulate the RTM mold filling and curing phases. Mold filling simulations were performed to obtain an effective injection strategy for the composite part. One‐point injection port and five‐point vents were obtained as an effective injection strategy using a trial and improvement process. Curing simulations were performed on the composite part using neat resin cure kinetics and cure process windows for neat resin and composite panel were developed. Subsequently, a cure difference window was developed to investigate cure difference progression between neat resin and composite panel at the processing conditions. Finally, the kinetics of cure difference progression was modeled as a function of neat resin cure conversion to design operable cure cycles for the composite panel. The results found that the cure differences converge with the increase in applied mold temperature.

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“…[4][5][6] SMC components are characterized by high glass transition (T g ) values and so a relatively poor vibration damping performance at around room temperature. [7][8][9] Then, when operating at this temperature, the vibration of SMC structures would lead to detrimental effects such as noise, dynamic stresses that shorten the structural fatigue life and reduced performance. [10][11][12] Therefore, enhancing the vibration damping capacity of SMC structures represents an interesting field to be studied.…”

Section: Introductionmentioning

confidence: 99%

SMC/TPE bi‐layer configurations for structural vibration damping applications

Burgoa

Lekube

Zulueta

2021

J of Applied Polymer Sci

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Sheet molding compounds (SMCs) have considerable potential as lightweight alternative to traditional materials used in automotive components. However, despite their outstanding mechanical properties, their vibration damping characteristics are often relatively poor for several applications. Therefore, enhancing the vibration damping capability of SMCs represents a field with increasing interest. Application of viscoelastic layers to high stiffness materials, such as SMCs, represents an effective approach to add vibration damping functionalities to lightweight structural components. In this work, the incorporation of thermoplastic elastomers (TPEs) is studied as a novel strategy to enhance the structural vibration damping capability of SMCs. Several types of SMC and TPEs have been considered and the effect of TPE‐SMC thickness ratio on the damping and stiffness properties is investigated. The viscoelastic properties and vibration damping performance were evaluated by dynamic mechanical analysis. The effect of TPE addition on stiffness was studied by three‐point bending. Results reveal the potential of the incorporation of thin TPE layers as cost‐effective strategy to enlarge the vibration damping efficiency of SMCs while maintaining their overall high stiffness. It is expected that the bi‐material configurations presented in the current study will contribute to advance the development of new lightweight multi‐functional solutions for modern transport applications.

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Thermo-mechanical behaviour of composite moulding compounds at elevated temperatures

Cited by 14 publications

References 33 publications

Effects of hygrothermal aging on the thermomechanical properties of a carbon fiber reinforced epoxy sheet molding compound: An experimental research

Effects of hygrothermal aging on the thermomechanical properties of a carbon fiber reinforced epoxy sheet molding compound: An experimental research

Design of effective injection strategy and operable cure window for an aircraft wing flap composite part using neat resin characterization and multi‐physics process simulation

SMC/TPE bi‐layer configurations for structural vibration damping applications

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