Sheet Molding Compounds

Orgéas, Laurent; Dumont, Pierre J. J.

doi:10.1002/9781118097298.weoc222

Cited by 40 publications

(25 citation statements)

References 271 publications

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“…Epoxies can also be thickened, but not using the same type of agents commonly used for polyesters [20]. Many high performance epoxies can be formulated as B-staged systems, where the reaction between the resin and the curing agent is incomplete after mixing.…”

Section: Introductionmentioning

confidence: 99%

Flow characteristics of carbon fibre moulding compounds

Evans

Qian

Turner

et al. 2016

Composites Part A: Applied Science and Manufacturing

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This paper presents the development of a low-cost carbon fibre moulding compound using an automated spray deposition process. Directed Fibre Compounding (DFC) is used to produce charge packs directly from low cost carbon fibre tows and liquid epoxy resin. A range of material and process related parameters have been studied to understand their influence on the level of macroscopic charge flow, in an attempt to produce a carbon fibre moulding compound with similar flow characteristics to conventional glass fibre SMCs.Charge packs covering just 40% of the mould can be effectively used to process DFC, without detrimentally affecting void content, fibre distribution and mechanical properties. Tensile stiffness and strength values of 36GPa and 320MPa are reported for isotropic materials (100% charge coverage), which increase to 46GPa and 408MPa with flow induced alignment (50% charge coverage) at 50% fibre volume fraction.

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Section: Introductionmentioning

confidence: 99%

Flow characteristics of carbon fibre moulding compounds

Evans

Qian

Turner

et al. 2016

Composites Part A: Applied Science and Manufacturing

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show abstract

“…[1][2][3] Sheet molding compounds (SMCs) have wide application fields in aerospace, agricultural, rail and marine, and building and construction, but SMCs fabrication has been motivated mostly by the automotive industry. 2,4 Moreover, among the advantages of SMCs, the ability to adjust their formulations is very interesting. [5][6][7] The composite matrix of SMCs is a combination of polyester, vinylester or epoxy as a thermosetting resin, fillers such as alumina, calcium carbonate, and thickeners, referred to as additives.…”

Section: Introductionmentioning

confidence: 99%

“…[5][6][7] The composite matrix of SMCs is a combination of polyester, vinylester or epoxy as a thermosetting resin, fillers such as alumina, calcium carbonate, and thickeners, referred to as additives. [1][2][3][4][5][6][7][8] A variety of fiber reinforcement can be used including glass or carbon fibers with a volume fraction between 10% and 65%.…”

Section: Introductionmentioning

confidence: 99%

Multiscale damage analysis of the tension‐tension fatigue behavior of a low‐density sheet molding compound

Shirinbayan

2020

J of Applied Polymer Sci

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This article presents the experimental findings of tension-tension stresscontrolled fatigue tests performed on low-density sheet molding compound (LD-SMC). LD-SMC composite is a type of SMC including a polyester resin reinforced with chopped glass fibers bundles and hollow glass spheres. The coupled frequency-amplitude affects the nature of the overall fatigue response, which can be controlled by the damage mechanisms accumulation and/or by the self-heating. In fact, the self-heating produced a material softening and decreased the fatigue lifetime. For fatigue loading at 80 Hz, self-heating has been observed and yielded to a temperature rise to 65 C, which is more than a glass transition temperature of polyester. Thus, the polyester matrix is subjected to remarkable thermally activated modifications of its physical state. Multiscale damage analysis of the randomly-oriented sample in fatigue showed that the first observed damage phenomenon corresponds to the debonding of the hollow glass microspheres occurring in the fiber depleted zones.

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“…SMCs are thermosetting resin-based fiber-reinforced semi-finished materials. To a large extent, SMC is also a generic term describing this type of compound combined with the process to convert it into a composite part, which is usually based on compression molding [1]. In 2016, SMCs, in combination with bulk molding compounds (BMC), were the most produced glass fiber-reinforced composites [2], highlighting the importance of this material class for numerous technical applications.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Quasi-Static and Dynamic Material Properties of a Structural Sheet Molding Compound Combined with Acoustic Emission Damage Analysis

2017

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Sheet molding compounds (SMC) are discontinuously fiber-reinforced thermosets, attractive to the automotive industry due to their outstanding specific strength and stiffness, combined with a cost efficient manufacturing process. Increasingly important for structural components, a structural SMC-based improved resin formulation featuring no fillers is investigated in this study. The influence of fiber volume content, fiber length, and manufacturing induced fiber orientation on quasi-static and dynamic mechanical properties of vinylester-based SMC is characterized. Stiffness and strength increased with increasing fiber volume content for tensile, compression, and flexural loadings. Fiber length distribution did not significantly influence the mechanical properties of the material. The movement of the conveyor belt leads to an anisotropic fiber orientation and orientation-dependent mechanical properties. Acoustic emission coupled with machine learning algorithms enabled the investigation of the damage mechanisms of this discontinuous glass fiber SMC. The acoustic emission analysis was validated with micro computed tomography of damaged specimens. The dominant failure mechanisms of the SMC exposed to bending loading were matrix cracking and interface failure.

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Sheet Molding Compounds

Cited by 40 publications

References 271 publications

Flow characteristics of carbon fibre moulding compounds

Flow characteristics of carbon fibre moulding compounds

Multiscale damage analysis of the tension‐tension fatigue behavior of a low‐density sheet molding compound

Investigation of Quasi-Static and Dynamic Material Properties of a Structural Sheet Molding Compound Combined with Acoustic Emission Damage Analysis

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