Designing for the absorption of shock is quite complex. In each design, a different approach needs to be taken depending on the type of shock load, the function of the part, and the environmental conditions. In this section we can only give you a few general guidelines to help you on your way.
 

• The basis of design for shock absorption is to ensure your construction can deflect to absorb the load rather than providing a hard, rigid stop
• Distribute the elongation over the entire part In case of shock loads, a varying cross section will perform significantly better: thicker section where the bending moment is high, thinner sections where the bending moment is low. This will equalize the stresses throughout the part.
• Eliminate any abrupt stiffness changes in the construction This follows on from the previous item; anywhere where there is an abrupt change in stiffness, there will be a concentration of stress. These changes can be sudden changes in wall sections, ribbing, bosses, holes etc.
• Avoid stress concentrations and notches
• Ensure ribs are well rounded off at the base and use rounded corners for better stress transfer.
• Move weld lines out of high stress areas
• Move gates away from high stress areas
• Select the right material for the job

Polyamide 66 has better shock absorbing properties than most other engineering plastics. Impact modified grades are available. Before selecting a grade, please contact your Nilit representative who will help you select the right grade for your application.