In weld, Large amount of heat is generated. For which near the welding zone some are experienced tension and some experienced compression. That zone is called Heat Affected Zone(HAZ).

1. NUMERICAL ANALYSIS ON
RESIDUAL STRESS ON PLATE
GUIDER
Submitted By Tejaskriya Pradhan
Under the guidance of
Dr. Debabrata Podder

2. Content

3. Introduction
• Steel Production In 2 stages
• In both the stage we are using Welding.
• The welding creates residual stress on the plate or
in material.
Assembly
on site
The manufacture
of parts under
workshop
conditions

4. • In weld, Large amount of heat is generated. For
which near the welding zone some are experienced
tension and some experienced compression.
• That zone are called Heat Affected Zone(HAZ).
Fig1 : Source : “Formation of Compressive Residual Stresses by Shot Peening For Spot Welded Stainless
Steel Plates”

5. • After removing the heat or after the welding
the stress locked in the parent material.
• That stress is called residual stress.
• The residual stress creates huge problems in
construction.
• So for perfect and durable design we have to
know the residual stress.
• But till now there is no such model to identify
the residual stress of high strength steel.

6. Fig – 2 : a trapezoidal or block-like distribution whose borders are determined based on
geometrical parameters
Source :Euro Code

7. Literature Review
• In 2010 a research is done by Rabih Kassab et al.
• Objective :to find combined heat loss coefficient
taking in account the heat energy lost by
radiation
• Using double ellipsoid model of Goldak
• Ansys __“birth and death” property Simulation

8. Fig 3 : Heat Source Model propersoed by J. Goldak
Source : “A New Finite Element Model for Welding Heat Sources,” by J. Goldak, A. Chakravarti and M.
Bibby.

9. Figure 4 shows the mesh densities and the location of the fixed nodes.

10. Figure 5 shows the results of Nodal solutions

11. Results
• During the both simulations, thermal and
structural, the temperature dependent
thermo-physical material properties were
taken in consideration.
• A new formula has been presented for the
determination of the combined heat loss
coefficient taking in account the heat energy
lost by radiation.

12. • In 2008 by W Sun et al. A research was done .
• To predict imperfections by simulations and
engineering models.
• By doing Experimental and numerical study –
fabrication of welded plate girders (Workshop
Condition)
• Special focus is put on the effect on residual
welding stress.

13. • steel construction, usually the production
contains two stages
– The manufacture of parts under workshop conditions
– the assembly on site
• The former can be partially automated and has a
much higher level of reliability compared to site
welds.
• The former can be partially automated and has a
much higher level of reliability compared to site
welds.

14. • Theoretical principles
• The welding simulation allows the understanding
of complex interactions during welding and
cooling and thereby a more targeted optimization
of the design.

15. • Introducing symmetry to the model would require
that the system and the loads (loads may be
illustrated better by an imaginary shrinkage force in
this context) are symmetric.
• Assuming that all welds were deposited
simultaneously it is enough to model a quarter of
the system.

16. Results
• Yet, no sufficient models are available as has been
shown by the comparison of welding simulation
and simplified models.
• For further investigations relevant parameters such
as the heat control, the thickness and the material
have to be taken into account.
• For high strength steels it should be noted that
existent models may lead to very conservative
results as deviations tend to increase for higher
material grades.