Department of Mechanical and Industrial Engineering, IIT Roorkee
+91-1332-284909
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Aluminium alloys of the 2xxx series (Al-Cu-Mg) have proven to be the technically superior material for a wide range of application, particularly in aerospace, automotive, and transportation sector. These structural components are often subjected to severe cyclic loading conditions during their cycle of operation. To produce large structural components, various conventional joining techniques i.e. riveting, welding, were previously used. However, due to various dis-advantages (defects) in the conventional joining techniques leads the researcher to develop a new joining technique i.e. friction stir welding technique, a solid state welding. The heterogeneity in material’s microstructure due to welding would cause higher stress-concentration and better site for crack formation in the welding zone which deteriorates the fatigue life of the components. Currently, I am doing post weld heat treatment followed by various artificial aging treatment process to enhance the fatigue life of FSWed components and to change in near-threshold property using various ΔK-controlled test.
Download the CVPiezoelectric materials have widespread applications in modern technical areas such as mechatronics, smart structures or microsystem technology, where they serve as sensors or actuators. For the assessment of strength and reliability of piezoelectric structures under combined electrical and mechanical loading, the existence of crack like defects plays an important role. Meanwhile, piezoelectric fracture mechanics has been established quite well, but its application to realistic crack configurations and loading situations in piezoelectric structures requires the use of numerical techniques as finite element methods (FEM) or Extended finite element method (XFEM). Currently I am working with XFEM modelling to compute the coupled electro mechanical boundary value problem of cracks in 2D piezoelectric structure under static loading. In order to calculate the relevant fracture parameters very precisely and efficiently, the numerical treatment must account for the singularity of the mechanical and electrical fields at crack tips. The following specialized techniques are going to be implemented: (1) special treatment of XFEM for exact crack face boundary condition (2) determination of mechanical and electrical displacement intensity factors from near tip fields. Special emphasis will be devoted to a realistic modeling of the dielectric medium inside the crack, leading to specific electric crack face boundary conditions.
Download the CVAdditively Manufactured Aluminium alloys have been gaining attention in the aerospace industry due to its several advantages including significant material and mass saving, near-net-shape capabilities, geometrical flexibility, and considerable reduction of concept-to-validation time. Despite its many advantages, additively manufactured components suffer from the limitation of a higher population of void defects and tensile residual stresses generated during fabrication. As the aerospace components are subjected to variable loading and different environmental conditions, these defects make the components susceptible to a lower fatigue life as compared to the traditionally manufactured components. This reduced fatigue life undermines the advantages of additive manufacturing. The focus of my research is to evaluate and improve the fatigue life of additively manufactured aluminium alloys under different environmental and load conditions. Currently I am studying the effect of heat treatment on the fatigue crack growth of additively manufactured AlSi10Mg under different load conditions (R-ratios).
Download the CVThe demand for manufacturing of light-weight metal structures with highly complex shapes is increasing day by day and their manufacturing is becoming a big challenge using conventional processes. This resulted in the development of the 3D printing technology also known as “Additive Manufacturing (AM)”. With this technique, it is possible to make complex shape structural components required in several applications such as aerospace, automobile, biomedical and other sectors. Better strength to weight ratio and elevated temperature properties of titanium alloys (such as: Ti-6Al-4V) makes them a good choice in these critical components. However, this aspect of additively manufactured titanium alloys has been overlooked. The end-products of AM for components used in these sectors are often subjected to complex cyclic loadings under severe environmental conditions. Also, Additive manufacturing is associated with several defects like porosities, residual stresses, hot cracking, delamination, lack of fusion, etc. All these defects, loadings and environmental conditions are already known to affect monotonic as well as cyclic properties of the component and thus needs to be investigated. Currently, I am investigating the creep and fatigue damage behavior of additively manufactured Ti-6Al-4V at elevated temperature.
Download the CVI wish to explore the area of fatigue in advanced manufactured materials using the principle of additive manufacturing. Generally, fatigue studies are done within 1×106 cycles only, which may not be suitable for designing the high temperature and long-run applications components like rotors and blades of turbine engines. Therefore fatigue of materials manufactured using additive manufacturing still remains a challenge, and this needs to be addressed. With these aims, I want to propose the additively manufactured advance functionally graded (FG) components using novel alloys and composites promising superior high-temperature fatigue properties. The properties of these components shall be tested for fatigue and fracture studies of up to 109 cycles (VHCF) in extreme high-temperature and corrosive environments, corresponding to the design life of the component. My long term goal is to stay in academics. Hence, I can contribute to both the Mechanical and Industrial Engineering Department and the Indian Institute of Technology Roorkee.
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