Fused Deposition Modelling (FDM), a renowned Rapid Prototyping (RP) process, has been successfully implemented in several industries to fabricate concept models and prototypes for rapid manufacturing. This study furnishes terse notes about the material damping properties of FDM made ULTEM samples considering the effect of FDM process parameters. Dynamic Mechanical Analysis (DMA) is carried out using DMA 2980 equipment to study the dynamic response of the FDM material subjected to single cantilever loading under periodic stress. Three FDM process parameters namely Build Style, Raster Width and Raster Angle were contemplated. ULTEM parts are fabricated using solid normal build style and three values each of raster width and raster angle. DMA is performed with temperature sweep at three different fixed frequencies of 1, 50 and 100 Hz. Results were obtained for dynamic properties such as Maximum Storage Modulus, Maximum Loss Modulus, Maximum Tan Delta and Maximum Complex Viscosity. The present work discusses the effect of increasing the frequencies and temperature on FDM made ULTEM samples using different FDM process parameters.
Fused Deposition Modelling (FDM) has attained its reputation due to the capability of rapidly fabricating prototypes from concept design to real parts in shorter time and lower cost than traditional manufacturing processes. This study sheds light on the dynamic mechanical properties of Polyphenylsulfone (PPSF) material fabricated by FDM additive manufacturing process considering the effect of its various process parameters. Three major FDM process parameters are considered in this study, namely, raster angle, raster width and build style. Dynamic Mechanical Analysis is carried out with sweeping temperature at three different fixed frequencies, e.g., 1 Hz, 50 Hz and 100 Hz. Taguchi method is employed for the optimization of process parameters towards achieving better damping properties. Experimental results such as maximum storage modulus, maximum loss modulus, peak of Tan Delta and maximum complex viscosity are captured and the effects of process parameters on these damping properties of PPSF samples are investigated.
The project is about the computational study of Single Expansion Ramp Nozzle (SERN). A comparison is carried out for four different cowls of length 2h with initial arc radii of 0mm, 10mm, 20mm and 30mm. The ramp and the cowl are angled. The study elaborates the effect of arc (0mm, 10mm, 20mm and 30mm) in the cowl on the performance of the SERN. The CFD procedure is validated by comparing with experimental results. The optimum design is obtained by analyzing the computational result.
As the next generation of metallic implants, Ti6Al4V porous structures have captivated more attention; however, the primitive compressive strength of the Ti6Al4V material is drastically reduced in its porous form while matching its Young’s modulus with that of the bone to avoid ‘stress-shielding effect’. This work sheds light on an unconventional approach to develop a metallic implant that addresses the twin demands of having high compressive strength and low Young’s modulus matching with that of the bone. This study focuses exclusively on the compressive behavior because most of the implants like hip and knee prosthesis are subjected to compressive loading. Porous Ti6Al4V structures with porosity ranging from 60–75 % are fabricated using electron beam melting, an additive manufacturing technique. And then, a pressureless infiltration technique is carried out to infiltrate pure magnesium, a good biodegradable material, into the porous structures by casting process. The compressive behavior of the infiltrated structures is analyzed and compared with porous Ti6Al4V structures. The compressive strength of the porous Ti6Al4V structures is enhanced up to 200 % after infiltrating it with biodegradable magnesium without much change in the modulus, making it a good candidate for the biomedical metallic implants. Moreover, the stress-strain characteristics of the magnesium-infiltrated Ti6Al4V samples exhibited ductile nature when compared with the stress-strain curves of the porous Ti6Al4V samples, which showed brittle nature, thereby enhancing the energy-absorbing quality of the metallic implant.
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