Most stressed coils in helical compression springs
Most stressed coils in helical compression springs
(OP)
Dear spring experts,
Every mechanical handbook provides equations to calculate the torsional stress at the coils of a helical compression spring, corrected for the curvature effect via the Wahl factor. But it is known that not all coils participate to the same extent to the load bearing action, as the edge ones are practically inactive. My question is, is there an equation that allows us to predict which are the most stressed coils of the spring?
Thank you in advance.
Every mechanical handbook provides equations to calculate the torsional stress at the coils of a helical compression spring, corrected for the curvature effect via the Wahl factor. But it is known that not all coils participate to the same extent to the load bearing action, as the edge ones are practically inactive. My question is, is there an equation that allows us to predict which are the most stressed coils of the spring?
Thank you in advance.





RE: Most stressed coils in helical compression springs
The intermediate coils are stressed in nearly pure torsion.
The end coils are stressed in bending, because they act as levers in order to induce the torsion.
Only completely closed penultimate coils, for which there is not usually enough space, are not greatly stressed.
Mike Halloran
Pembroke Pines, FL, USA
RE: Most stressed coils in helical compression springs
Thanks for the reply.
Isn't the Wahl factor aimed at correcting the torsional stress with the bending effect?
Is there any expression that allows to quantify this effect? Should we then brutally split the spring in two regions, one working in bending and the other in torsion + bending? (See above)
RE: Most stressed coils in helical compression springs
Mike Halloran
Pembroke Pines, FL, USA
RE: Most stressed coils in helical compression springs
RE: Most stressed coils in helical compression springs
Mike Halloran
Pembroke Pines, FL, USA