Static Structural Analysis of Sheet metal Bending

AIM :

To perform static structural analysis on sheet metal bending using three different materials and find out and compare the results like Equivalent stress, Equivalent Strain,Directional deformation in Y-axis on the different materials with each other.

Model :

Material Selection and their Properties :

i) Aluminium Alloy NL 1199

ii) Copper Alloy NL

iii) Magnesium Alloy NL

Procedure :

• Drag and drop static structure on workspace. In engineering data select the specified materials. Modify any material if required. In this case it is Aluminium alloy NL to Aluminium alloy NL 1199.
• Open Design modeller and import the geometry. Close the design modeller.
• Open Mechanical Solver,Apply manual contact on the Sheet, punch and Die.
• Mesh the model approriately. Mesh the sheet and contact surfaces finer and also mesh the sheet with tetrahedrons for accurate results.
• In analysis settings, apply displacements as boundary conditions to all three components.

for Punch - All free and displacement in negative Y-axis as -0.5,-1.5,-3,-6,-9,-12,-13.5,-12,-10,-8

For Sheet - Only for Z displacement as 0 .

For Die - All free and displacement in Negative Y-axis for last two time steps as -1.5 and -3

• Now for results, apply equivalent stress,equivalent strain,directional deformation and stress on the sheet.
• After applying Click on Solve.

Mesh :

Element size for -

Sheet - 1 mm

Die and Punch - 4 mm

Contact Surfaces - 1 mm

No. of elements - 6246

No. of Nodes - 17882

Mesh quality -

Results : CASE I -

1) Aluminium Alloy NL 1199

a) Equivalent stress -

b) Equivalent stress (Sheet) -

c) Directional Deformation -

d) Equivalent Strain -

2) Copper Alloy NL

a) Equivalent Stress -

b) Equivalent stress (Sheet) -

c) Directional Deformation -

d) Equivalent Strain -

3) Magnesium Alloy NL

a) Equivalent Stress -

b) Equivalent stress (Sheet) -

c) Directional Deformation -

d) Equivalent Strain -

Conclusion -

From the above table ,We can see that Equivalent Stress is maximum in the Aluminium alloy and minimum in Magnesium alloy.

As of stress in the sheet, Copper alloy has maximum stress in the sheet and Aluminium alloy has minimum.

Directional deformation in Y - axis is maximum in Magnesium alloy and minimum in Copper alloy.

lastly Equivalent strain is maximum in aluminium alloy and minimum in Magnesium alloy.

CASE II -

Aluminium alloy 1199 with 0.19 as frictional Coeffcient -

a) Equivalent Stress -

b) Equivalent stress (Sheet) -

c) Directional Deformation -

d) Equivalent Strain -

Conclusion -

As the frictional Coefficient increases, Equivalent stress and Equivallent Strain decreases and Directional deformation increases as we can see it in the above table.

CASE III :

Aluminium alloy 1199 with Sheet of mesh size 0.7 mm

a) Mesh -

Element size for -

Sheet - 0.7 mm

Die and Punch - 4 mm

Contact Surfaces - 1 mm

No. of elements - 12770

No. of Nodes - 28571

b) Equivalent stress -

c) Equivalent stress (Sheet) -

d) Directional Deformation -

e) Equivalent Strain -

Conclusion -

As the mesh gets finer, the results will become more accurate. From the above table, we can see that as the mesh gets finer the results are increased meaning that the results gets more accurate.