Using Hyper mesh - Optistruct, Bracket was redesigned and meshed. Material & properties were assigned along with loads, load collectors and simulation was carried out to reduced overall stress in the bracket by 10%. Result shows that Von Mises stress of the redesigned bracket reduced from 66.8 to 49.8 when compared to the original model.
1. Pratik Saxena (gd8959)
WAYNE STATE UNIVERSITY
FALL 2016
PROJECT # 3
FINITE ELEMENT METHOD- ME 5040
Analyze the following Bracket for stress performance. Use following information in setting up the model:
Material Properties for the bracket:
Modulus of Elasticity = 2.1E+05 MPa Poisson’s Ratio = 0.3
Density = 7.85E-09
Apply a positive y-direction loading of 500 N at the center of the rectangular cutout. (using RBE2
Spider)
Constrain the Bracket in all 6 d.o.f. at the locations marked by (x) in the iges data.
Use a mesh size of approx. 5 mm.
Use midsurface or offset option in Hypermesh to create the midsurface for meshing.
For project 3, redesign the bracket (without increasing the gage) to reduce the stress by at least 10%.
Submitted by: - Submitted to: -
Pratik Saxena (gd8959) Dr. Ali Ozbeki
2. Pratik Saxena (gd8959)
Step 1: - The original file is opened in the hyper mesh Optistruct.
Step 2: - The pre-existing elements are re-meshed with the element size 4
Step 3: - The thickness is increased by 1 mm to reduce the stresses.
Step 4: - Same material and property are used as before
E= 2.1 e+5 µ=0.3 Density=7.85e-9 T (thickness) =6
Step 5: Creating load collector and providing constraints to the check points in all 6 D.O.F. (which are projected
on the surface of bracket). Also providing the force of 500 N at the center node created between the holes of
bracket.
Step 6: - Creating load step and providing SPC as SPC and LOAD as force.
Step 7: - Running the model in Optistruct. The following results/plots are obtained.
Results/plots of original v/s alternative: -
Counter plot for displacement of original model: -
Counter plot for displacement of alternative model: -
3. Pratik Saxena (gd8959)
Counter plot for Von mises stress of original model: -
Counter plot for Von mises stress of altenative model: -
The stresses are reduced from 66.8 to 49.8.
Redesigned bracket (without increasing the gage) reduced the stress by at least 10%.
