Holes may have a considerable influence on the loadability of injection molded products. Both the stress concentration and the effect of processing are important factors. The present research project investigates the combined influence of stress concentration, weld line and local distribution of molecular orientation on injection molded polystyrene plates with a molded-in hole. It is concluded, that the loadability is dominated by the peak stress position at the hole, especially in combination with a low melt temperature during injection molding
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