Deflection of a Plate under the Gravitational Load

Let us consider a beam under the gravitational load g. A length of the beam is L. The beam cross-section is a b x h rectangle.

Sought quantity is the maximum deflection of the beam.
Let us use the following initial data: L = 1 m, b = 0.5 m, h=1.5 mm.
Material characteristics: the Young's modulus E = 2.1E+011 Pa, Poisson's ratio ν = 0.28, ρ=7800 kg/m3.

The finite element model with applied loads and restraints

The analytical solution is calculated by the formula:

Thus, | z | = 2.428313E-001 m.

After carrying out calculation with the help of AutoFEM, the following results are obtained:

Table 1.Parameters of the finite element mesh

Finite Element Type

Number of Nodes

Number of Finite Elements

linear triangle

1326

2500

Table 2. Result "Displacement"

Numerical Solution
Displacement | z* |, m

Analytical Solution
Displacement | z |, m

Error δ =100%* |z* - z | / | z |

2.3290E-001

2.4283E-001

4.09

 

 

*The results of numerical tests depend on the finite element mesh and may differ slightly from those given in the table.

 

 

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