Learning Forum

[Kaushal Vadnere]

Hi Sneha,

What is the magnitude of the load being applied, is it very low compared to the dimensions? If the stresses in structure are significantly low, it is normal to have 1e6 cycles minimum and you may not see any reduction in fatigue life at any point of the structure. 1e6 cycles is considered as infinite life for majority of the materials and hence it is considered as standard maximum value. Your model shows 1e6 cycles as minimum, standard interpretation of this is that your structure has infinite life and it will not fail due fatigue. If you see minimum value lower than 1e6 cycles, that means the structure does not have infinite life and may fail after given minimum cycles of fatigue loading.

Also, the concrete material available in engineering data does not have a S-N or E-N curve defined which is needed for fatigue calculations. Have you added your own S-N or E-N curve in the material properties? 
If not, can you check if the concrete is assigned to the geometry and not the the default structural steel.