PU Design Suggestions
Sharp edges or corners, externally or within the polyurethane part, should be avoided, particulaly where the polyurethane is stressed.
The generous use of fillets or overhangs serves to distribute stress over a broader area, thus improving the bond and increasing the useful life of the part.
Equalization of Stress
Proper design tends to equalize stress distribution.
When designing polyurethanes for dynamic applications, avoid:
- Sharp corners at edges of bonded areas
- Sharp angles in the polyurethane which tend to focus stresses
- Sharp lips or edges which would cut or magnify stress concentration
- Complicated parts which, in addition to requiring expensive molds, have many points of stress concentration
- Designs which prevent natural shaping of the polyurethane when under a load