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PhD scholarship in Residual Stress Measurement and Design of Advanced Metal Microstructures

Technical University of Denmark - Department of Mechanical Engineering

Qualification Type: PhD
Location: Lyngby - Denmark
Funding for: UK Students, EU Students, International Students
Funding amount: Not Specified
Hours: Full Time
Placed On: 10th October 2018
Closes: 18th November 2018

DTU, Department of Mechanical Engineering, the section for Manufacturing Engineering has a vacant 3-year PhD position in the recently granted project by Danmarks Frie Forskningsfond (DFF). The position is to be filled January 1st 2019 or soon after that.

Residual stresses develop locally in materials during manufacturing and service, and are crucial for the mechanical and physical properties including strength, ductility and fatigue lifetime. To optimize the materials performance and to design advanced materials, it is therefore essential to determine non-destructively the local residual stresses and relate them to the local materials inhomogeneities in 3D. So far, such measurements are rare and can only be done at large international synchrotron facilities. In the new DFF project, a new laboratory based X-ray diffraction technique, LabXRS, will be developed, which will be a game-changer enabling many more scientists to perform sufficient numbers of local RS measurements. 

This project aims at using mainly this new technique supplemented by synchrotron techniques to quantify for the first time systematically the level of local residual stresses and to investigate their influence on the mechanical properties of multiphase materials. 

The aims of the project are to: 

  • Characterize the level and distribution local residual stress in different phases in metals after different thermo-mechanical processing, and relate the stress to the local microstructures
  • Develop a new crystal plasticity finite element model to predict the residual stress and to investigate its effects on the plastic deformation and mechanical properties
  • Design advanced metals with superior mechanical properties by tailoring the microstructure and local residual stresses.

Responsibilities and tasks

To achieve the goals, advanced 3D/4D laboratory and synchrotron x-ray techniques will be used to quantify the microstructure and local residual stress of metals after different thermo-mechanical processing. The PhD will plan and conduct experiments and analyze the results. Advanced crystal plasticity finite element modeling will be developed incorporating real 3D microstructures and stress states. This will be in corporation with an external partner in France. The candidate will work in close collaboration with a group of senior scientists, technicians as well as Post Docs and PhDs and with the Danish Company Xnovo Technology ApS.

Some of the research questions this project will address are: 

  • What is the magnitude and distribution of the local residual stress within different phase of the metal?
  • How does the stress build up?
  • How does annealing affect stress relaxation?
  • What is the relation between the local residual stress and microstructure parameters, e.g. texture and grain size?
  • How does the local residual stress affect the local plastic deformation during tensile and fatigue tests, and thus the mechanical properties of the material?

Application

Read full job advertisement at www.career.dtu.dk

DTU Mechanical Engineering covers the fundamental engineering disciplines within Solid mechanics, Fluid mechanics, Coastal and Maritime Engineering, Energy systems and energy conversion, Materials and Surface Engineering, Manufacturing Engineering, Engineering design and Product development. The department has a scientific staff of about 150 persons, 95 PhD students and a technical/administrative support staff of about 80 persons.

DTU is a technical university providing internationally leading research, education, innovation and scientific advice. Our staff of 6,000 advance science and technology to create innovative solutions that meet the demands of society, and our 11,200 students are being educated to address the technological challenges of the future. DTU is an independent academic university collaborating globally with business, industry, government and public agencies.

   
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