Plate with a Hole

Stress concentration on plate with a hole

Case:1

For case 1 structural analysis carried out on plate with a hole of diameter 60 mm. The ,material is used is structural steel. The plate is modelled in Ansys spaceclaim software and is shown as below:

The dimension of plate are:

Lenght=300 mm

Width=120 mm

Thickness = 30 mm

The 2D geometry is created and model is imported in Ansys. The extruded model is shown in image below:

The properties of material used in given below:

The model is meshed using Ansys with an element size 4mm and a patch controlling mathod Tetrahedron is used.

One side is fixed and in other side a pull force of 5000 is applied as shown.

The result of deformation and maximum stress are:

Case 2: In this case structural analysis is carried on a plate with three holes in it.

Dimensions of plate is:

Lenght=300mm

Width= 120 mm

Thickness= 30 mm

Central hole diameter = 60 mm

Two other holes = 30 mm each

The 2D geometry is created and model is imported in Ansys. The extruded model is shown in image below:

The properties of material used in given below:

The model is meshed using Ansys with an element size 4mm and a patch controlling mathod Tetrahedron is used.

One side is fixed and in other side a pull force of 5000 is applied as shown.

The result of deformation and maximum stress are:

Conclusion:

Deformation:

Case 1: 2.75 microns(max)

case 2: 2.97 microns (max)

Stress:

case 1: 6.18 MPa

case 2: 5.98 MPa

As the stress in case 2 is less, so as Design point of view case 2 model is preffered.

From ,manufacturing point of view case 1 model will be preffered as less work to be done in case 1 model , hence cost of production of case 1 model will be lesser.