Radiusing the plastic injected parts

One of the most common errors is sharp corners in plastic injected parts design. Designing with sharp corners may failure in final use because the sharp corners are areas of high stress concentration and drastically reduce the impact feature of plastic injected parts. At the same time, it can prolong the service life of products.

In general guideline, that removing sharp corners to radiuse corners or transitions is highly recommended to eliminate stress concentration, and it will increase the strength of the corner and transition and facilitate flow of the plastic material. Fig 1 and Fig 2 illustrate recommended design for using radii in corner to add strength, and help eliminate warpage.

Fig 1 Radii design for corners

Fig 2 Curves and fillets in a injection molded part prevent stress concentrations

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