ABSTRACT

ASME PVP 2020, MINNEAPOLIS, MINNESOTA USA, JULY  19 – 24, 2020

Bridget Kogo                                                 Bin Wang

PhD Student of Mechanical Engineering                     Reader in Mechanical Engineering

Brunel University London, Middlesex, UK                 Brunel University London, Middlesex, UK

 

Luiz Wrobel                                                   Mahmoud Chizari                      

Profession in Mechanical Engineering                         Senior Lecturer in Mechanical Engineering

Brunel University London, Middlesex, UK                  University of Hertfordshire, Hatfield, UK

 

VERIFICATION OF STRESS MODEL IN DISSIMILAR MATERIALS OF VARYING CLADDED PIPES USING A SIMILAR CLADDED PLATE MODEL

Residual stress analysis has been a major challenge in the structural integrity of structures both in manufacturing and engineering joining processes such as welding, riveting, bolting, brazing and soldering. This research addresses the residual stresses present in the welding of two dissimilar materials and explains the reasons why the stress distributions observed in two clad thicknesses of the welded plates are different.

To examine the thermal model, a gas metal arc welding (GMAW) was carried out in-house which entailed welding of different clad thicknesses of stainless steel and mild steel. In parallel, a finite element modelling of thermal distributions was carried out using ABAQUS CAE. A close agreement between the simulated and experimental models was discovered.

The study tried to employ the Gaussian transformation principle in the stress model to handle geometries of the model. Likewise, the residual stress obtained from computer modelling was validated using the experimental result performed by other researchers who utilized the Gaussian distribution for circumferential welding. It was discovered that the stress profile of the dissimilar materials of current study was closely matched with those found by other researchers.

The computer simulated stress obtained in this study was also compared with that of Feli et al who employed the Goldak and Akhlaghi double ellipsoidal heat source model for moving heat and the dependency of the stress model. The comparison was promising and further proved to be consistent.

The plate model later expanded to a pipe model and the simulation was considered a full pipe. Discoveries made entailed the fact that for the internal surface of the pipes, close to the region of weld, there are perturbations and ‘crown effects’ of the stress distribution and disparities include the fact that farther away towards the end of the pipe, profiles were varied. Likewise, for the stress distribution on the outer pipe surfaces, but was observed that the stress profile close to the weld centre experience some disturbances ad a crown like profile where it evens out farther away from the weld centre and some variations observed.

This research has been done as a part of an ongoing research. Further development has been made to complete the previous publication done by authors. 


Verification of Stress Model in Dissimilar Materials of Varying Cladded Pipes Using a Similar Cladded Plate Model

Division / Sponsors: 
Pressure Vessels & Piping (PVP)


Paper Proceedings: https://asmedigitalcollection.asme.org/PVP/PVP2020/volume/83815

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