In structural analysis, what does it mean when frame rails 'sway'?

When frame rails 'sway,' it refers specifically to their sideways movement caused by collision impact. This phenomenon occurs when external forces, such as those from a crash, induce lateral motion in the structure of the vehicle. Such swaying can compromise the integrity of the frame and affect the alignment of components, leading to potential safety hazards and the need for repairs.

Understanding this motion is crucial for assessing damage in a structural analysis context. It signifies that the frame rails are not merely shifting forward but are also experiencing horizontal displacement, which can significantly impact the overall stability and performance of the vehicle. Therefore, identifying and addressing this swaying is essential when evaluating structural damage and planning for appropriate repair strategies.