FEMAP Project

By

Muhammad Ziaur Rahman

1 Identification of Load Position for Maximum von Mises Stress (mesh size=default)

1.1 Load is applied at bottom

According to the above figure-

Amount of maximum von Mises stress

Stress Position

7282

Inner bottom surface of the bracket

1.2 Load is applied at middle

According to the above figure-

Amount of maximum von Mises stress

Stress Position

13501

Inner bottom surface of the bracket

1.3 Load is applied at top

According to the above figure-

Amount of maximum von Mises stress

Stress Position

15520

Inner top and bottom surface of the bracket

Also at the fillet

So maximum von Mises stress generates when load is applied at the top pin position

2 Demonstration of the Position of Peak von Mises Stresses for Different Load Position

Load is applied at bottom pin, mid pin and top pin position respectively

3 Mesh Convergence Study: Mesh Size vs. Peak von Mises Stress

Mesh

Size

Peak von Mises Stress

0.127 16506

0.1 16659

0.08 16574

0.06 16945

0.04 17471

0.03 17701

With the decrease of mesh size peak von Mises stress increases and it starts to saturate at around the mesh

size of 0.03. So 0.03 is the mesh size we are going to use to design our problem

So maximum value of peak von Mises stress is 17701 psi which is found for a mesh size

of 0.03

4 Factor of Safety Study

Δ t2=0, Δt1=0.01

When t1 is increased for 0.01 inch and t2 is kept unchanged, peak von Mises stress is found to

be 16610 psi

Factor of safety, η= yield stress/peak von Mises stress=2.107

Deformed front view and isometric view of the final design with a factor of safety=2.107 are given in the

next page.

Final Result

Thickness changes are : Δt1=0.01

Δ t2=0.0

Factor of Safety η= 2.107

FINAL DESIGN : FRONT VIEW

FINAL DESIGN : ISOMETRIC VIEW