Applied Mechanics and Materials Vol. 903

Abstract: This present investigation explore the microstructural properties of SDSS grade SAF2507 weldments produced by constant current GTAW and constant current GTAW with superimposed high frequency (HF) current. The macro, microstructural examination and mechanical characterization were performed. From the results, it was found that, the superimposition of high-frequency current on the welding current results in constriction of the arc during constant current GTAW with superimposed HF current. The superimposed HF current restricts the arc with for all intents and purposes a similar root and extended diameter. The weldment region unit considered the standard for mechanical and microstructural properties. The dominance of properties because of the association of inter pulse or HF current is described along with its related science concerned.

Abstract: Polymethyl methacrylate (PMMA) is one among few known photo-polymeric resin useful in lithography for fabricating structures having better mechanical properties to meet the requirement in electronics and biomedical applications. This study explores the effect of Photo Initiator (PI) concentration and also curing time on strength and hardness of Polymethyl methacrylate (PMMA) obtained by UV photopolymerization of Methyl methacrylate (MMA) monomer. The UV LED light source operating at the wavelength of 364 nm is used with Benzoin Ethyl Ether (BEE) as photo initiator. The curing of PMMA resin is supported with peltier cooling device placed at the bottom of the UV light source. The characterisation study of UV photo cured PMMA is analysed through nano indenter (Agilent Technologies-G200). The current work investigates the influence of PI concentration and curing time in achieving maximum mechanical properties for UV photopolymerized PMMA.

Abstract: The maraging steel are considered ultra-high strength due to its yield strength greater than 1400Mpa and are part of a set of advanced materials of interest for technological development, mainly for aeronautics and aerospace industry. For this purpose they should exhibit good toughness, fatigue resistance and acceptable weldability. Since the maraging steels are of higher cost we are intended to make the Medium Carbon Low Alloy Steel (MCLA) for the purpose of aeronautical and aerospace industry instead of Maraging steel as the cost of MCLA is comparatively less. An attempt is made to study on the basic properties of MCLA steels and Maraging steels by process modifications and comparing the results with that of the standard properties of the Maraging steel.

Abstract: Cadmium sulfide (CdS) doped with different concentrations of Ni (2, 4, 6, 8, and 10 %) nanoparticles have been synthesized by chemical co-precipitation method. X-ray diffraction (XRD) studies confirm the crystalline nature of Ni doped CdS nanoparticles had a hexagonal wurtzite structure. Williamson-Hall (W–H), Size-Strain Plot (SSP), and Halder-Wagner (H–W) methods have been used to investigate the average particle size, lattice strain, stress, and energy density from the XRD peak broadening analysis. In W–H method, the models of uniform deformation, uniform deformation stress, and uniform deformation energy density have been implemented to determine the elastic parameters.

Abstract: Super Austenitic Stainless Steels (SASS) belongs to the category of austenitic stainless steels which were known for their excellent corrosion resistance when used in structural applications like desalination plants, oil piping systems, heat exchanger equipments which demands high temperature service and harsh environments. Several works on SASS dealt about the corrosion resistance of the material in its normal base metal form. But structural uses needs SASS to be welded with similar or dissimilar materials to fit into the applications. This study aims to present a detailed view on issues related to the weldability of super austenitic stainless steels and the future scope of welding on SASS.

Abstract: Steels of various grades are ubiquitous in the modern economy. Cooling of steel during the production process is an important deciding factor about its final mechanical properties. This is dependent on the characteristics of the industrial setup and coolant used. Studies have been undertaken for analysis of their influence on the cooling rate, given specific parameters, for suitable industrial use and optimal production. The present study and experiments undertaken highlight the variation of the cooling rate of a Mild Steel Plate in a miniaturized Run Out Table (ROT), using air­water mist spray cooling under different initial plate temperatures and nozzle bank distances.

Abstract: In the present work, reactive DC magnetron sputtering method is used to deposit TiO₂ thin films on glass substrates. The structural, surface morphology and optical studies of TiO₂ thin films were discussed by varying the oxygen flow rates from 1 to 4 sccm. X-ray diffraction patterns of TiO₂ thin films show amorphous nature. The surface morphological and elemental composition of TiO₂ thin films were examined by field emission scanning electron microscopy and energy dispersive X-ray spectroscopy. From the optical absorption spectra, the shifting of absorption edge towards the longer wavelength leads to the decrement of optical bandgap from 3.48 to 3.19 eV with an increase of oxygen flow rate from 1 to 4 sccm.

Abstract: Fused Deposition Modelling (FDM) is one of the additive manufacturing processes which can produce prototypes or functional components without the use of fixtures, and the lead time required is reduced drastically compared to traditional machining processes. The application of the FDM process in the biomedical and casting industries is limited by its poor surface roughness which is most generally caused by the staircase effect and chordal error of the 3D model. Owing to the drawbacks of mechanical based finishing techniques, researchers have come up with a new technique known as Vapour Smoothing (VS). In this work, past literature of the VS process of FDM components is reported and it has been seen that the VS process is giving a promising improvement in surface roughness of FDM components.

Abstract: The attractiveness of glass is something that occupied the world market with a unique claim. It has many applications that go beyond the provision of visual aesthetics, which includes a view of the inside and out. Due to extreme levels of clarity, structural glazing may be so transparent that it may go unnoticed by design or make a strong visual impact such as the focal point of a building. This paper focused on structural glass with various laminated/laminated conditions that were used to investigate the Dynamic Mechanical Properties. The storage modulus (G'), loss modulus (G'') and damping factor (tan delta) were determined at various levels, ranging from room temperature to elevated temperatures (250 °C) to understand the behavior of glass structure with and without laminated glass over a range of temperatures. The G' & G'' were tested to understand the effect of bonding, fracture behavior between the pure glass and laminated glass to observe the response with respect to temperature. Results are found that G' and G'' improve over a range of temperatures for laminated glass with enlightening fracture behavior. Laminated glass also has a major influence on the damping factor, but it also depends on the laminated thickness and materials. Thermo-Mechanical Properties of laminated glass are more improved, without affecting the transferability of glass.