Swedish Neutron Education for Science & Society

Prabhat Pant, Nepali

I come from the background of Aerospace/Aeronautical Engineering. I completed my Master study in Aerospace Engineering from Fachhochschule Wiener Neustadt (FHWN), Austria in November 2016 and have a bachelor’s degree in Aircraft and Helicopter Design from National Aerospace University, Kharkiv, Ukraine. During my master’s thesis, I have worked on process optimization to produce Aerospace interiors with significant exposure to the effect of processing parameters in the final part outcome. During this period an initial study on the spring-in effect of in multilayer carbon/Glass fiber composite was also done. During my studies, I also have gained insight into the mechanics and behaviors of metals/composites, design of parts as per the manufacturing process and materials being used. I am interested in Aircraft and Engine Design and keen to learn more about the new materials and manufacturing method being used in this industry.

My project in SwedNess is to utilize the neutron diffraction method in management of residual stresses formed in parts manufactured by 3D printing (additive manufacturing). Residual stresses, originating from inevitable temperature gradients created in a part during manufacturing, can lead to quality issues such as crack formation, distortion, and reduction of fatigue resistance of the manufactured part. Neutron diffraction is one of the main methods for residual stress measurements. This method uses Bragg’s diffraction law to measure residual strains, from which residual stresses are derived. The deeper penetration of neutron beams makes neutron diffraction a unique method for measuring residual stresses in the interior of parts. In this project, residual stresses associated with additive manufacturing process are analyzed using the neutron diffraction method as well as numerical simulations. The magnitude and distribution of residual stresses are to be optimized for improved part quality through part geometry design and process parameter optimization. The final objective of the project is to draft a guideline to manage residual stress in manufacturing of parts with powder bed infusion method and to eventually establish a methodology for residual stress management in additive manufacturing in general.