Multiscale residual stress measurement methods - Developing a new residual stress measurement method at micro and nano scales for crystalline materials

Residual stresses exist in many engineering materials and structures. They arise within a structure whenever a material has undergone virtually any manufacturing process that causes thermal or compositional gradients or that involves plastic deformation. Residual stresses have the same effect on engineering components as a stress generated by applied loads. Hence, they contribute directly to the material reaching yield by combining externally applied load even if the applied load itself might not bring about permanent deformation in the material. They also alter the material’s performance and stimulate failure. Consequently, it is important to quantify the magnitudes and components of the residual stresses existing in engineering materials. Residual stresses are present across multi scales, from nano to macro and suitable measurement tools have to be used for the evaluation of residual stresses.

The aim of this project is to develop a new residual stress measurement method at micro and nano scales for crystalline materials. This technique will be based on deformation measurement experiments. The project consists of three stages. In the first stage, a methodology for the residual stress measurement method using the eigenstrain theory will be established. In the second stage, the technique will be validated with the help of numerical experiments. In the final part, the technique will be used to measure residual stresses in engineering components. Experience with finite element analysis (ABAQUS) and programing languages (MATLAB and FORTRAN) would be advantageous

The successful candidate should have, or expect to have, an Honours Degree at 2.1 or above (or equivalent) in Mechanical, Manufacturing Engineering or Material Science.

Essential Knowledge: programing language and finite element modelling.

Knowledge of: Materials modelling, .Experimental mechanics