Week 1 Stress Concentration on a Plate with hole

Figure 1 Equivalent stress in two cases plate with one hole and three holes

If we compare stresses in two cases in figure 1, then we find that minimim stresses at left and right hand side of holes are lower in the case 2 with three holes. As well as maximum stresses at upper and bottom hand side are also lower in case 2.

Similarly, Total deformations are lower in case 2 with three holes as shown in figure 2.

As an automotive engineer, from an analysis point of view case 2 must be prefereed, as is has lower stresses and deformatins. Plus it will also have less weight increasing efficiency of any automobile vehicle.

From manufacturing point of view there is no difference in the complexity of production of the given objects. However, case 2 will take more time in manufacturing as three holes will be drilled in plate.

and if they are die casted then there will be no difference except having two different moulds produced.

It is worth noting that case 2 will also save material, resulting in low cost of the product.