Mechanical Characterization of Sheet Moulding Composites for the Automotive Industry

Lamanna, Giuseppe; Ceparano, Angelo

doi:10.2174/1874088x01408010108

Cited by 11 publications

(8 citation statements)

References 38 publications

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“…For short fibre (or discontinuous fibre) composites, the benefits of using beaded fibres may be more pronounced. First, for many applications with short fibres, such as sheet moulding composites for structural parts in the automotive industry, the fibre volume fractions are much lower than that of composites using continuous fibres and can be even as low as 22% [ 38 ]. Therefore, obtaining beaded fibre composites of practical volume fraction is feasible and is not impeded by the presence of beads on the fibre.…”

Section: Discussionmentioning

confidence: 99%

Fragmentation of Beaded Fibres in a Composite

et al. 2022

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The fibre–matrix interface plays an important role in the overall mechanical behaviour of a fibre-reinforced composite, but the classical approach to improving the interface through chemical sizing is bounded by the materials’ properties. By contrast, structural and/or geometrical modification of the interface may provide mechanical interlocking and have wider possibilities and benefits. Here we investigate the introduction of polymer beads along the interface of a fibre and validate their contribution by a single fibre fragmentation test. Using glass fibres and the same epoxy system for both matrix and beads, an increase of 17.5% is observed in the interfacial shear strength of the beaded fibres compared to fibres with no polymer beads. This increase should lead to a similar improvement in the strength and toughness of a beaded fibre composite when short fibres are used. The beads were also seen to stabilise the fragmentation process of a fibre by reducing the scatter in fragment density at a given strain. A case could also be made for a critical beads number—4 beads in our experimental system—to describe interfacial shear strength, analogous to a critical length used in fibre composites.

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Section: Discussionmentioning

confidence: 99%

Fragmentation of Beaded Fibres in a Composite

et al. 2022

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“…The microsection of the SMC components allowed for a qualitative assessment of fiber/matrix adhesion [36]. Thus, for further investigation of the fiber/matrix impregnation, a scanning electron microscopic (SEM) was used to observe the fracture surfaces of the SMC components.…”

Section: Microscopic Investigationsmentioning

confidence: 99%

“…Thus, for further investigation of the fiber/matrix impregnation, a scanning electron microscopic (SEM) was used to observe the fracture surfaces of the SMC components. Typically, images captured with a scanning electron microscope have a high depth of focus and thus allow the analysis the corresponding fiber/matrix adhesion, which has a decisive influence on the mechanical properties of SMC [36]. Therefore, three small rods were taken from each SMC components and notched after preparation.…”

Section: Microscopic Investigationsmentioning

confidence: 99%

Investigation of the Mechanical Properties of Vinylester-Based Sheet Moulding Compound (SMC) Subject to Particle Recycling

et al. 2022

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In light of climate change, fiber-reinforced plastics (FRP) are becoming increasingly important due to their lightweight construction potential. This benefit is additionally expanded on with the low cycle times, scrap rates and material costs of Sheet Moulding Compounds (SMC), making it the most often used material on the FRP market. While extensive studies regarding the recycling of SMC with unsaturated polyester-based matrices (UP-SMC) have been conducted in the past, this is not the case for vinylester-based SMC (VE-SMC). In this research, VE-SMC components were subject to a particle-recycling approach. Recyclate in the form of VE-SMC regrind was used to substitute SMC matrices during the compounding process. The dependence of the mechanical properties and failure behavior of VE-SMC containing regrind was investigated by means of microscopic and mechanical test methods for varying mass proportions of SMC regrind. Due to the addition of SMC regrind, a decreased fiber/matrix adhesion was observed. Furthermore, an increase in pore formation was observed with an increasing proportion of SMC regrind. The flexural modulus increased by 20% with a low percentage of regrind (ωrSMC = 10 wt.%) in comparison to virgin SMC. In contrast, the tensile properties decrease (up to 30%) with the addition of SMC regrind independent of the investigated proportions of SMC regrind.

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“…The quasi-static behavior, damage development, and uniaxial fatigue response of glass fiber SMC-R are also well documented in literature . [1][2][3][4][5][6][7][8][9] The interest in carbon fiber SMC-R is more recent and studies on their mechanical properties and processing characteristics are relatively few.…”

Section: Introductionmentioning

confidence: 99%

Static and fatigue behavior of a carbon‐fiber SMC‐R composite under combined tensile and shear stresses

Ramakrishnan

Mallick

2022

Polymer Composites

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Randomly oriented short fiber reinforced sheet molding compound composites (SMC‐R) are among the most commonly used composites for automotive and many non‐automotive structural applications. Many studies have reported the static and fatigue properties of SMC‐R composites under uniaxial stress conditions. However, there are many applications in which they may be subjected to biaxial stress conditions and their biaxial properties have not been reported in literature. The current study considers the static and fatigue characteristics of a randomly oriented carbon fiber SMC‐R under both uniaxial and biaxial loading conditions with various combinations of tensile and shear stresses. A butterfly shaped Arcan specimen was used to conduct the biaxial stress tests. Since both static strength and fatigue life data exhibited significant variability, statistical analysis was conducted using Weibull distribution to analyse the variations in these properties of the material. In biaxial conditions in which a shear stress is imposed along with a tensile stress, the tensile strength of the material decreases with increasing shear stress. A failure envelope drawn based on von Mises equation shows reasonable agreement with the experimental results. As a percentage of the static strength, the fatigue strengths at 1 million cycles in tension and combined equal tension and shear are significantly higher than the fatigue strength in pure shear.

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Mechanical Characterization of Sheet Moulding Composites for the Automotive Industry

Cited by 11 publications

References 38 publications

Fragmentation of Beaded Fibres in a Composite

Fragmentation of Beaded Fibres in a Composite

Investigation of the Mechanical Properties of Vinylester-Based Sheet Moulding Compound (SMC) Subject to Particle Recycling

Static and fatigue behavior of a carbon‐fiber SMC‐R composite under combined tensile and shear stresses

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