Investigation of the process and geometry dependent tensile and shear strength of weld lines in polystyrene
In order to understand the formation of weld lines and the resulting reduction of the part’s tensile strength, influencing factors such as process parameters and part geometry on the morphology and tensile as well as shear strength of weld lines in polystyrene were quantified. In the investigations an influence of melt temperature, holding pressure height as well as flow obstacle geometry and distance to the flow barrier on the tensile strength of weld lines could be determined. Contrary to the literature, a high strength was found directly behind the flow obstacle. Furthermore, the formation of a weak boundary layer could be observed. An influence of the varied parameters on the shear strength was not found.
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