Personal research summary 2017

1. Research interests and experience:
residual stresses, creep, fracture and structural
integrity.
Dr Kiranmayi Abburi Venkata
Postdoctoral Research Associate
Solid Mechanics Research Group

2. Research areas
• Computational mechanics & structural integrity
• Microstructural analysis of materials and interfaces
• Advanced joining techniques
Research focus: Characterisation of residual stresses
(RS) from manufacturing processes and quantifying the
effects of residual stresses and plastic strain history on
structural integrity.

3. Some current projects
Weld inhomogeneity
effects on creep in
dissimilar welds (DMW)
Left: Comparison of creep rupture
strength of cross-welds
Right: Predicted and measured RS
after PWHT in DMW
EBSD analysis to identify phases at the interface of DMW
Left: Phases at the weld interface with
a single pass in DMW
Right: Phases at the weld interface with
two passes in DMW

4. Some current projects
Transferability from small
scale lab specimens to
large scale components
RS characterisation in an
Inconel 3-pass TIG weld
Left: FE mesh of weld half model
Right: Predicted RS across the weld at the
interface (at a depth of 8 mm)
Effects of RS on elastic-
plastic fracture in DMW
Left: Measured RS ahead of crack-tip using
neutron diffraction in DMW
Right: Predicted equivalent SIF with and
without RS in DMW
Left: Normalised predicted T-stress for various
crack lengths in pipes
Right: Predicted normalised constraint
parameter for various crack lengths in pipes