Large-scale AM processes do not suffer from many of the manufacturing constraints that are commonly associated with the small-scale processes, such as the requirement for additional support structures or limitation to a horizontal build plane. However, they often give rise to a significant degree of microstructural anisotropy, which in turn leads to orientation dependence in the mechanical properties. In addition, the degree of residual stresses that develop within a component due to processing conditions can lead to unacceptable part deformation or even catastrophic failure due to cracking. Successful construction of large-scale (~1 to >10 m) metallic components by means of direct metal deposition (DMD), for safety-critical applications is directly connected to the design and the processing conditions and sequence which requires a thorough understanding of metallurgical structures, residual stresses and associated mechanical properties.

The aim of this project is to develop a novel, material-centric computational design approach, whereby suitable models can be employed to achieve properties on-demand at specified locations within a design. Accounting for macro- and micro-scale properties early in the design phase constitutes a major leap forward in manufacturing technology. Therefore, the main challenge for this project is to realize 3D topology optimization strategies which, next to the structural layout, account for local material properties caused by the overall process history and post processing. Highly novel aspect of the approach will be treating deposition trajectory as an integral part of the optimization technique. Optimisation of large-scale DMD structures by developing advanced design techniques will yield AM ready designs.

The project is a part of nation-wide research programme Additive Manufacturing for Extra Large Metal Components where both experimental and computational investigation of the metallurgical, mechanical properties at multiple length scales will be performed and will be provided as an input to the project. Moreover, validation of the design method on industrial use cases will be performed in collaboration with RAMLAB located at the port of Rotterdam with state of the art additive manufacturing facilities.

Applicants should have the following qualifications:
• MSc. degree in mechanical, civil, aerospace engineering or a closely related field.
• Background in solid mechanics, finite element analysis and (adjoint) sensitivity analysis.
• Strong programming skills
• Good communication skills and ability to be a team player in a multidisciplinary setting
• Self-starter with initiative and ability to set up, organize and execute his/her own research and meet targets
• Good command of the English language.

Fixed-term contract: 4 years.

The TU Delft offers a customisable compensation package, a discount for health insurance and sport memberships, and a monthly work costs contribution. Flexible work schedules can be arranged. An International Children’s Centre offers childcare and an international primary school. Dual Career Services offers support to accompanying partners. Salary and benefits are in accordance with the Collective Labour Agreement for Dutch Universities.
As a PhD candidate you will be enrolled in the TU Delft Graduate School. The TU Delft Graduate School provides an inspiring research environment; an excellent team of supervisors, academic staff and a mentor; and a Doctoral Education Programme aimed at developing your transferable, discipline-related and research skills. Please visit graduateschool.tudelft.nl/ for more information.
TU Delft sets specific standards for the English competency of the teaching staff. TU Delft offers training to improve English competency.

For more information about this position, please contact Can Ayas, phone: +31 (0)15-2781550, e-mail: c.ayas@tudelft.nl.
To apply, please e-mail:
• a letter of interest (including motivation relevant to the research topic)
• a detailed curriculum vitae (including study curriculum rankings if available, relevant research experience and publications)
• Your official transcripts (in English)
• 2 reference letters including full contact information of the referees
before March 15, 2018 to application-3mE@tudelft.nl. Applications after this date will be considered if the post is still vacant.
When applying for this position, please refer to vacancy number 3ME18-08.

Delft University of Technology

Delft University of Technology (the TU Delft) is a multifaceted institution offering education and carrying out research in the technical sciences at an internationally recognised level. Education, research and design are strongly oriented towards applicability. The TU Delft develops technologies for future generations, focusing on sustainability, safety and economic vitality. At the TU Delft you will work in an environment where technical sciences and society converge. The TU Delft comprises eight faculties, unique laboratories, research institutes and schools.

http://www.tudelft.nl

Faculty Mechanical, Maritime and Materials Engineering - PME

The 3mE Faculty trains committed engineering students, PhD candidates and post-doctoral researchers in groundbreaking scientific research in the fields of mechanical, maritime and materials engineering. 3mE is the epitome of a dynamic, innovative faculty, with a European scope that contributes demonstrable economic and social benefits.

The Department of Precision and Microsystems Engineering (PME) focuses on developing knowledge and methods for small, innovative high-precision devices and systems, such as precision equipment and scientific instrumentation for the high-tech industry. Increasing miniaturisation and function density, and improving precision, speed and reliability are the key topics in our work. Our approach is multidisciplinary, fundamental and inspired by industry needs. 

The vacant position is in the Structural Optimisation and Mechanics (SOM) research group. This group combines engineering mechanics and structural optimisation for application hightech systems. Our research is scientifically challenging, and topics include the development of methods, knowledge and technologies for the analysis and optimization of mechanical problems and 3D designs. 

https://www.tudelft.nl/en/3me