PhD Theses (Mechanical Engineering)

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Browsing PhD Theses (Mechanical Engineering) by Author "Barik, Saibal Kanchan"

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    Formability and Failure Response of AA5052-H32 Sheets Deformed using a Shock Tube
    (2022) Barik, Saibal Kanchan
    The emerging interest to minimize fuel consumption and carbon emission, lightweight component design has become one of the important goals in the automotive industries. Among the lightweight materials, aluminium alloys are used significantly in automotive body construction because of their acceptable strength to weight ratio, toughness, ductility, and corrosion resistance. However, the limitations include the moderate formability in the conventional sheet forming processes at room temperature and significant springback during stamping of complex geometries. Thus, improving the formability of aluminium alloys receives much attention in the stamping industries. Generally, warm forming and high-velocity forming are preferred to improve the formability of aluminium alloys. However, heating metals during deformation imposes an additional cost to the forming operation. Thus, various high-velocity forming processes are in demand because the inertial effect developed during these processes that delays necking by developing additional tensile stress outside the neck resulting in enhanced formability. In the recent past, various high-energy rate forming (HERF) processes such as electro-magnetic forming (EMF), electro-hydraulic forming (EHF) and explosive forming (EF) have been preferred to fabricate net-shaped products without any defects. Despite several advantages of HERF processes, the major limitations are the higher capital cost, difficulties in machine handling, and requirement of skilled persons.