Тест 4.7 Stability of the rod with rigid inserts

Verification of the LIRA-FEM software / Тест 4.7 Stability of the rod with rigid inserts / Numerical solution: Calculation with replacement of the rigid insert by a rod of high stiffness.



Тест 4.7  Stability of the rod with rigid inserts

Numerical solution: Calculation with replacement of the rigid insert with a high stiffness rod.

Geometry:

А

В

С

X

0

4

6

Y

0

0

-4

Z

0

0

3

material characteristics: ЕA=2.7 х 105 т, EIy=EIz=2025 тм2, GI=4000 тм2,
ВС – hard insert.

Boundary conditions: Point A is pinched.

Нагрузки: Точка С:
Loading 1: Fx = 40 т,
Loading 2: Fy = -20 т,
Loading 3: Fz = 10 т.

CALCULATION RESULTS:

Loads

The desired value

Analytical solution

Calculation results (LIRA)

Uncertainty,%

1

Load reserve coefficient

3,676

3,677

0,03

2

6,53

6,34

0,15

3

16,875

16,875

0

1

Reserve coefficient taking into account bending-twisting forms

2,92

2,92

0

2

5,54

5,54

0

3

12,25

12,25

0



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