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bhumkaromkar

Fatigue analysis Minimum life is coming less than 1

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Hello all,

I have done static analysis of the structure using static load case of 971N. I have applied Fully reversible sinusoidal curve (100 cycles) for fatigue analysis in optistruct. SN curve is calculated in optistruct using UTS. After analysis i am getting minimum number of cycle as 1.581e-2 which seems unrealistic.

What can be the problem?

 

Rahul R likes this

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Hi,

 

Fatigue life is mainly dependent on b and fatigue strength coefficient. Check the parameters and Stress amplitude is directly available from maximum and minimum loads and try again. 

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@ Prakash Pagadala 

I am using SN life method for stress calculation.

For this SR1, B1 and NC1 values are directly estimated using UTS in fatigue process manager.

I have used this approach. Are their any additional values needed ?

TIA.

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