DC/MD/VA - Original Flyin' Miata 90-97 springs
#14
Trust me...the mileage on these doesn't matter.
It's a matter of fatigue stress design in springs.
In the above the y-axis is the stress in the metal coil of the spring, and the x-axis is the number of cycles to failure. You'll notice the curves for the material (ferrous one on top interests us here) approach a lower limit as expeted stress decreases.
A well designed spring will never see stresses near this limit, and therefore never have appreciable fatigue that would require fatigue life calculations. Airplane trusses have a fatigue life...automobile springs don't.
It's a matter of fatigue stress design in springs.
In the above the y-axis is the stress in the metal coil of the spring, and the x-axis is the number of cycles to failure. You'll notice the curves for the material (ferrous one on top interests us here) approach a lower limit as expeted stress decreases.
A well designed spring will never see stresses near this limit, and therefore never have appreciable fatigue that would require fatigue life calculations. Airplane trusses have a fatigue life...automobile springs don't.
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Jike Spingleton
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09-20-2016 04:33 PM