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ThesisItem Open Access Effects of post heat treatment on crack growth behaviour of MIG welded butt joints of dissimilar Aluminum alloys(G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2021-02) Sharma, Saurabh; Gope, P.C.Aluminium 7075 and 606I-T6 is one of the widely used materials for various applications in industry, aerospace, utensils, etc. In the present investigation, fatigue crack growth experiments were performed on MIG welded butt joint using filler ER 4043 and Silicon Carbide (SiC) nanomaterial reinforced 7075 filler material. The dissimilar material welded by these filler materials were subjected to three post heat treatment conditions such as artificially aged at 150°C for 16 h (HT1), cyclic solution heat treated at 400°C to 480°C for 2 h (HT2) and combination of both HT3 for 16 h and HT2 for 2 h is (HT3). The precracking was done at Pmax = 2kN and R=0.1. The constant amplitude cracks growth tests were conducted using CT specimen at a maximum load of 5 kN and stress ratio R= 0.1. The test frequency was kept 6 Hz. The results obtained from the crack growth tests were analysed intense of a-N curve, da/dN vs (AK) and Paris growth parameters were determined. The effect of post heat treatment as well as different filler materials on the crack growth were discussed. The fatigue life for MIG welded CT specimen using filler ER 4043 and Silicon Carbide (SiC) reinforced 7075 filler rods at as-weld and three heat treatment conditions HT1, HT2 and HT3 was found to be 27500, 24000, 22500, 21500 and 25500, 23500, 21500,20500 cycles respectively. Scanning electron microscope study of fracture surface at different locations was carried out to investigate modes of fracture due to heat treatments and filler compositions. The results reveal that presence of shiny surface along with tiny holes over the fracture surface leading to partial ductile.ThesisItem Open Access Parametric studies on thermal regenerator for benzene incineration(G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2016-08) Sharma, Saurabh; Murthy, D.S.Volatile organic compounds (VOCs) are the most common air pollutants which plays a significant role in creating an environmental imbalance. VOCs are one of the main sources of photochemical reaction in the atmosphere leading to various environmental hazards. Thermal oxidation is the only viable method for controlling toxic and other certain harmful air pollutants. Regenerative thermal oxidation incorporating two regenerators is quite effective in VOC incineration process. In the present work a mathematical model has been studied using the computer code developed in FORTRAN language. Present work deals with study of various operating parameters like particle diameter, bed cross sectional area and cycle time for different benzene concentrations. Temperature distribution in the bed for different particle diameters and bed cross sectional area is analysed. Effect of particle diameter and bed cross sectional area on regenerator bed length is also studied. Bed length is optimised in each case for attaining operative oxidation temperature of 9530C. Effect of cycle time on average exit temperature of hot gas as well as thermal heat recovery (TER) is also discussed. It is observed that with increase in particle diameter regenerator bed length increases and with increase in bed cross sectional area it decreases. TER remains constant with increase in particle diameter as well as bed cross sectional area. Increase in cycle time increases average exit temperature of hot gas which in turn reduces TER. TER remains constant up to cycle time of 600s but after that it starts reducing. The increase in benzene concentration after 1200 ppm significantly reduces Thermal Energy Recovery as well as bed length for corresponding particle diameters and bed cross sectional areas.
