Hi All,

Been attempting to validate simulation results against hand calculations, have been a hit and miss.

It seems the simulation results is somewhat similar with hand calculations when a test specimen with short span length is used.

Increasing the span length 10 times and the results from simulation doesn't tally with calculations.

Does anyone have similar occurrence?

Please critique my simulation setup and findings below:

**TEST SETUP**

1) Formula used: Taken from engineersedge

2) 2nd Moment of Area: Taken at, Lxx = 35.815316cm^4

**SPAN of 600mm**

3) Simulation Results: Average of 20.743 MPa

Hand Calculation: 21.51MPa

4) Simulation Results: Displacement in Y Direction Average of 0.077587mm

Hand Calculation: 0.07813mm

**SPAN of 6000mm**

5) Simulation Results: Average of 108.38 MPa

Hand Calculation: 215.10MPa

6) Simulation Results: Displacement in Y Direction Average of 25.663mm

Hand Calculation: 78.125mm

Hi Alexander,

The hand calculations are working under beam assumptions, so we should really run the study with beams to compare them.

I just ran them in beams and the results are better matched to the hand calcs. I've attached the file for you to review.

I think the issue is the restraints, with beams we have rotational degrees of freedom in the nodes whereas the solid elements you were using do not have these, so we have to be careful with the restraints we apply when comparing beam hand calculations with solid meshes.

Cheers

Steve