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Environmental Gasket Company LTD.


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Fatigue Values

Graphs apply to Group 2 and 3 disc springs made of 50 Cr V 4 and Group 1 disc springs made of Ck 67. The maximum fatigue life can be achieved with a statistical probability of 99 % under the following conditions:

 

 

  • Disc spring stacks with a maximum of 10 individual disc springs stacked facing alternate ways

  • Sinusoidal deflection - time function with a constant stroke and at a constant frequency below, permissible thermal limit

  • Guidance on guides (rod or sleeve) as noted in and hardened and ground surfaces of stack disc springs

  • Proper lubrication

  • Operating at room temperature

 

 

Number of load cycles achieved may reduce if operating conditions deviate from test conditions. This applies in particular to sudden load changes occurring during operation, faulty lubrication, or with corrosion and surface imperfections.

When the number of stacked disc springs increases, the number of load cycles is reduced in comparison to a single disc spring. This is influenced by:

 

 

  • Friction between the disc springs and guides

  • Friction between the disc springs in parallel