Experimental and analytical procedures for flow dynamics of sheet molding compound (SMC) in compression molding

Kau, H. T.; Hagerman, Edward M.

doi:10.1002/pc.750080306

Cited by 7 publications

(1 citation statement)

References 10 publications

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“…This behavior can be explained by considering the material viscosity. Because of its large volume fraction, the net-work of randomly chopped fibers has a strong resistance to flow in the radial direction [3]. At a high mould temperature and pressure, the polymer matrix, owing to its relative low viscosity, is more likely to be squeezed out of the fiber net-work rather than acting as a drag force to stretch the fiber net-work.…”

Section: Flow Behavior Of Smcsmentioning

confidence: 99%

Manufacturing and Testing of High Performance Sheet Moulding Compound

Hou

2008

AMR

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The paper describes the manufacture of thin composite panels using high performance sheet moulding compound (SMC). Topics discussed within the paper include characterisation of curing and flow behaviour of SMC material, tooling design concept and determination of suitable processing conditions for compression moulding. A Full scale “Burst test” was carried out to evaluate the mechanical performance of SMC panels. The overall performance of the SMC panels was satisfactory with all panels failed beyond the specification value. The main failure mode was a through-thickness cracking. In addition, a geometrical non-linear numerical analysis was also carried out to investigate the stress distribution and deflection behaviour of SMC panel during “Burst testing”.

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Section: Flow Behavior Of Smcsmentioning

confidence: 99%

Manufacturing and Testing of High Performance Sheet Moulding Compound

Hou

2008

AMR

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Mesostructure development during molding of sheet molding compounds

Mei

Piggott

1996

Polymer Composites

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Experiments have been carried out with sheet molding compounds in which the amount of shear developed during molding was varied by changing the charge size. The effects of pressure and temperature were also investigated. The moldings were characterized by their mesostructures and the influence of the mesostructures on the Izod toughness and flexural strength was examined. It was found that high degrees of shear resulted in fiber orientation and the spreading of the fiber bundles. However, this did not improve properties, and it was concluded that for optimum properties, small amounts of shear were desirable.

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A study of the impact behavior of chopped fiber reinforced composite

Kau

1990

Polymer Composites

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The impact behavior of sheet molding compound (SMC) plaques was determined by using an instrumented Instron puncture test machine and the failure mechanism was qualitatively assessed by examining the damage. The impact response of SMC in terms of the load‐deflection curve is fairly consistent and shows the characteristics of a composite, intermediate between a brittle and a ductile material. At the speed of 2 m/s (about 5 miles per hour) the fracture energy, i.e., energy to break, was determined to be about 10 J for a regular 3 mm thick R‐25 SMC panel. This value decreases exponentially with a decrease in the thickness of the panel (power of 2.7). The failure process could also be affected by the material factors (resin and fibers used in the composite). For instance, an examination of the length distribution of the fibers in the damage region indicates that a combination of fiber pull‐out and severe fiber breakage have contributed to the impact resistance. Also, the fiber length in the composite could alter the failure modes. With the 25 mm fibers, the damage consists of an even mixture of fiber breakage and fiber pull‐out, but with a mixture of equal numbers of longer (38 mm) and shorter (13 mm) fibers in the composite, the damage is shifted to predominantly breakage of the longer fibers.

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Experimental and analytical procedures for flow dynamics of sheet molding compound (SMC) in compression molding

Cited by 7 publications

References 10 publications

Manufacturing and Testing of High Performance Sheet Moulding Compound

Manufacturing and Testing of High Performance Sheet Moulding Compound

Mesostructure development during molding of sheet molding compounds

A study of the impact behavior of chopped fiber reinforced composite

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