Weld lines lead to a significant reduction of the mechanical properties of injection moulded parts. To provide a reliable method for the mechanical design of parts with weld lines, a calculation concept must be developed to predict the weld line strength. For this purpose, a semi-empirical model to describe a reduction factor depending on relevant process influences will be derived from the results of a variety of experimental investigations on stagnating and flowing weld lines. A simulation chain is developed to employ the model in an integrative simulation chain for injection moulded parts.
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