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- W2305585209 abstract "During the past twenty years there has been considerableinterest in developing the technology for manufacturing engineeringarticles from sheet moulding compound (SMC) by compression moulding.Some of the problems with this technology are associated with theflow of SMC during moulding.This research work proposes methods for characterising therheological behaviour of SMC and predicting the shape of chargesfor moulding articles free of weld-lines without substantiallyaltering the initial fibre orientation of the matrix.The theoretical development'of the charge shape predictionprocedure for moulding symmetrical and unsymmetrical plates includesa mathematical model of the compression flow process. which is usedto determine flow front development, and mould cavity pressure andvelocity distributions. The mathematical model assumes a Newtonianflow behaviour. An instrumented mould was designed. manufactured and used totest the mathematical model of the compression flow process. Theanalysis of the experimental work includes: moulding conditions (suchas mould cavity pressure, platen displacement and ram-force); fibreorientation measurements (using X-ray techniques); quantification offibre glass distribution by chemical methods; and material mechanicalproperties (e.g. tensile strength). There was good agreement betweenthe theoretical and experimental results for moulded symmetrical andunsymmetrical plates.A theoretical and experimental analysis of the rheological behaviourof 5MC was carried out as a second stage of the research workto test the validity of the Newtonian flow assumption. The work analysessqueeze flow of SMC discs with the aim of obtaining a better understandingof the basic rheological behaviour of SMC during compression moulding.The theoretical analysis treats the SMC as a viscoelastic materialhaving an equation of state with equal viscous. elastic and yield straincomponents. The time variation of compression force when squeezing theSMC discs between two parallel plates (one fixed and one mobile) hasbeen derived from the equation of state. The values of the elastic, viscousand yield components were determined by using a least-squares methodof curve fitting to the experimental results. The last part of the research work includes the application ofthe charge shape prediction procedure to mould an engineering articleunder industrial compression-moulding conditions. ·The results of thispractical application of the theory are discussed." @default.
- W2305585209 created "2016-06-24" @default.
- W2305585209 creator A5012055544 @default.
- W2305585209 date "1980-01-01" @default.
- W2305585209 modified "2023-09-24" @default.
- W2305585209 title "Prediction and characterization of compression mould flow for unsaturated polyester resin sheet moulding compound" @default.
- W2305585209 hasPublicationYear "1980" @default.
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