Threshold Thickness |
 
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Threshold Thickness |
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The specification of a threshold thickness allows you to take account of the fact that the fatigue strength of some structural members can be dependent on material thickness, fatigue strength decreasing with increasing thickness. If you specify a threshold thickness, the stresses calculated by LifeTime are further multiplied by a factor 
given by:
(1)
where 
is the specified threshold thickness; and 
is the greater of 
and the actual thickness of the particular location under consideration (this ensures that 
is always greater than or equal to 1). Note that although a single value of 
is input, 
is naturally computed individually for each hot spot, since the structure thickness may vary from location to location. The exponent value n can also be specified and defaults to 4.
•*FATIGUE DATA is used to assign fatigue data to hot spot sets.