Week 3 Verification of Weld Joints

Aim : To perform static structural analysis on Weld Joints.

Objectives :

• Simulate three different types of welding using three different weld materials.
• For each case, find out the Directional Deformation and equivalent strain experienced by the setup.
• Identify the weld joint that experiences the highest equivalent stress in each case and compare the results for all three cases

Engineering data and materials :

• Open engineering data
• Create materials from "Granta Design materials" library and General materials.

Geometry :

• Open spaceclaim and import the geometry.
• Check for abnormalities in geometry.

Model Setup :

• Open geometry and rename components as Big plate, Small plate, Rib 1 and Rib 2.
• Assign material to Components and welds as per requirement.

Contacts :

• Right click and select rename based on selection.
• Create frictional contact for joints without weld with frictional coeff as 0.2.

Meshing :

• Insert sizing for Big plate and small plate of size 5 mm.
• Insert sizing for Rib 1 and Rib 2 of size 4 mm.
• Generate mesh.

Analysis settings :

• In analysis settings switch on large deflection in case if it move in non-linear region.
• Run the simulation for 1 step since a static force is going to applied on smaller plate.

Loads :

• Give fix support on holes of bigger plate, since that plate is going to attached to wall with those holes.

• Create a force on smaller plate hole of magnitude 15000 N.

Solution :

Create output for :

• Directional deformation.
• Equivalent stress in complete model.
• Equivalent strain in complete model.
• Equivalent stress in Ribs.
• Equivalent stress in welds.
• Equivalent strain in Ribs.

Results :

Case 1 :

• Material for Plates = Stainless steel.
• Material for Ribs = Stainless steel.
• Weld material = Stainless steel.

Directional deformation :

Equivalent stress :

Equivalent strain :

Equivalent strain in Ribs :

Equivalent stress in welds :

Case 2 :

• Material for Plates = Stainless steel.
• Material for Ribs = Stainless steel.
• Weld material = Aluminium alloy wrought.

Directional deformation :

Equivalent stress :

Equivalent strain :

Equivalent strain in Ribs :

Equivalent stress in welds :

Case 3 :

• Material for Plates = Stainless steel.
• Material for Ribs = Copper Alloy.
• Weld material = Bronze.

Directional deformation :

Equivalent stress :

Equivalent strain :

Equivalent strain in Ribs :

Equivalent stress in welds :

Comparison of results :

Sr.No.	Results	Case 1	Case 2	Case 3
1	Directional Deformation Maximum (mm)	0.3262	0.3451	0.3745
2	Directional Deformation Minimum (mm)	-0.0349	-0.0346	-0.0313
3	Equivalent Stress Maximum (Mpa)	354.9498	362.1492	366.6674
4	Equivalent Stress Minimum (Mpa)	0.03446	0.0750	0.05077
5	Equivalent Strain Maximum	0.00198	0.00363	0.00261
6	Equivalent Strain Minimum	1.804 E-07	3.884 E-07	2.661 E-07
7	Equivalent Strain in Ribs Maximum	0.00103	0.00107	0.00130
8	Equivalent Stress in Welds Maximum (Mpa)	309.58	250.98	281.67

Following figure shows weld joints that experiences the highest equivalent stress in all three cases.

Conclusion :

• Directional deformation is more for Case 3 compared to Case 1 and Case 2.
• Equivalent Stress in Welds is maximum for Case 1 compared to Case 2 and Case 3.
• Case 3 has maximum equivalent stress compared to Case 1 and Case 2.