Research

The main aim of the research work is to investigate the sintering behavior and its impact on the material properties of 3D printed 17-4PH stainless steel. The samples were manufactured by the Atomic Diffusion Additive Manufacturing technique, the Metal X system. Cooling holes were printed with the sample in different build orientations giving an overview of the printability and accuracy of the atomic diffusion additive manufacturing (ADAM) technique. Samples were tested for chemical composition, roughness, particle size analysis, density, Energy Dispersive X-ray spectroscopy, and microstructure analysis using Scanning electron microscopy (SEM) to understand

the material properties. 

The main objective of this research is to develop a characterization method for parts fabricated metal powder bed fusion (PBF) processes, a type of additive manufacturing (AM) process. To characterize conventionally manufactured parts, many methods and standards are available, while no comprehensive standards or methods are available forAMparts. In this work, a mechanical property characterization method is proposed that involves statistical analysis to select sample sizes and test coupon design considerations for metal printing, printing parameters, and applicability of existing testing standards for metal PBF, in addition to several mechanical properties. 

The objective of this research is to investigate axisymmetric supersonic intake SR-71 scaled model at Mach number of 4. To understand this mixed compression intake and quality of inlet flow, static and total pressure measurement in the duct are measured. Also, color schlieren technique is used to observe shock effect on external flow. To improve pressure recovery of intake, surface correction of cone is attempted. By using taper plug different blockage (0%, 30%,60%,90%) area of exit are obtained to locate normal shock in throat for minimum loss of pressure. Design model, instrumentation, intake operation, inlet buzz and data analysis are covered in detail in this research.

Tomography technique was used to recover the three-dimensional density distribution of a flow field generated by a rectangular nozzle. The flow field was investigated through background oriented schlieren (BOS) setup, where the flow induced density gradients were captured as a 2D projected image. These 2D information were post-processed to retrieve back the phase of the interrogating beam, which later used in tomography. The research was an attempt to use iterative tomography technique with BOS captured data for quantifying the three-dimensional flow field. The ability of the proposed technique, which required relatively lesser projections to recover the three-dimensional domain, was verified through iterative phase numerical simulations. Even CFD simulations showed good agreement with experimental data.