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The mechanical properties and dry sliding wear behaviour of glass fabric reinforced epoxy (G-E) composite with varying weight percentage of silicon dioxide (SiO 2 ) filler have been studied in the present work. The influence of sliding distance, velocity, and applied normal load on dry sliding wear behaviour has been considered using Taguchi's L 9 orthogonal array. Addition of SiO 2 increased the density, hardness, flexural, and impact strengths of G-E composite. Results of dry sliding wear tests showed increasing wear volume with increase in sliding distance, load, and sliding velocity for G-E and SiO 2 filled G-E composites. Taguchi's results indicate that the sliding distance played a significant role followed by applied load, sliding velocity, and SiO 2 loading. Scanning electron micrographs of the worn surfaces of composite samples at different test parameters show smooth surface, microploughing, and fine grooves under low load and velocity. However, severe damage of matrix with debonding and fiber breakage was seen at high load and velocity especially in unfilled G-E composite.

a b s t r a c tThe present work illustrates, 3D finite element analysis (FEA) of low-pressure (LP) steam turbine bladed disk assembly are carried out at a constant speed loading condition. The prime objective is to study structural integrity of bladed disk root with aid of design considerations at design stage. Secondly, design rules are developed for structural integrity of blades and disk considering a factor of safety for material, manufacturing and temperature uncertainties. These design rules are in turn used as design checks with aid of finite element analysis results.Investigations are performed based on Neuber formulae for solving a highly non-linear problem employing linear analysis tool ANSYS 12.0. Local peak stresses at blade and disk root fillet of linear analysis is used to identify the equivalent non-linear stress value by strain energy distribution method for estimating the minimum number of cycles required for crack initiation for low cycle fatigue (LCF) calculations.Design methodology is developed to address the structural integrity of blades at design point and for off-design conditions.

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Sliding wear behaviour of combined chemically modified Sansevieria and Carbon fiber reinforced epoxy (TSria/CF-E) and its multi-phase nanocomposite coupons has been carried out by Taguchi design of experiments. A Taguchi L16 orthogonal array and ANOVA were used to examine the consequence of tribo-system parameters on the tribological behaviour of hybrid TSria/CF-E composites filled with nano-CaCO3 and nano-SiC. The specific wear rate was calculated for each experiment for nano-CaCO3 and nano-SiC multi-phase composites. The normal load was found to have the highest significant influence of 42.15 % on the SWR of the nano-CaCO3 composite, whereas in case of the nano-SiC filled composites, the filler loading was found to have the highest significance of 62.34 % on the SWR. The improvement in the wear resistance was attributed to high strength, high hardness, and good dispersion of nano-SiC particles, which can enhance the interfacial bonding of nanofiller and the epoxy matrix. The lowest specific wear rate of composite was 0.06 × 10 -4 mm 3 /N m. Examination of the worn micrographs of the confirmation experiment shown adhesive and abrasive wear as the prevailing mechanisms.