Introduction to aircraft materials, Ferrous alloys, super alloys, composites/non-metallic composites, Properties of materials–Aluminum alloys – Nano crystalline aluminum alloys – Titanium alloys – α-β alloys, Super plasticity – Structural titanium alloys. Lab experiments: 1. Exercise on composites & repair work. 2. Perform double lap joint strength test as per the ASTM procedure.
Micro mechanics – Mechanics of materials approach, elasticity approach– Bounding techniques – Fiber volume ratio – Mass fraction– Elastic constants– Macro mechanics –stress-strain relations with respect to natural axis, arbitrary axis –Experimental characterization of lamina – Failure theories of a lamina – Hydrothermal effects on lamina. Lab experiments: 1. Fabrication of Composite plate using Compression Molding Technique 2. Carry out the tensile test of the prepared composite specimen as per the ASTM procedure.
Governing differential equation for a laminate - In plane and flexural constants of a laminate –Hydrothermal stresses and strains in a laminate – Failure analysis of a laminate – Netting analysis – Uses of composite structures in aerospace engineering. Lab experiments: 1. Carry out three point bending test of the composite specimen as per ASTM procedure. 2. Carry out shear test of the composite specimen as per ASTM procedure.
Manufacturing methods: Hand and spray lay - up, injection molding, resin injection, filament winding, pultrusion, centrifugal casting and prepregs. Fibre/Matrix Interface, fibre/epoxy, glass fibre/polyester. Various open and closed mould processes manufacture of fibers –Types of repair techniques in composites – Autoclave and non-autoclave methods, Stitched composites. 3D composites. Lab experiments: 1. Fabrication of Composite plate using Hand layup method. 2. Fabrication of Composite plate using Vacuum infusion method.
Basic design concepts of sandwich construction – Materials used for sandwich construction – Failure modes of sandwich panels – Bending stress and shear flow in composite beams. Lab experiments: 1. Exercise on Sandwich composites. 2. Bending stress Analysis in Sandwich panels
Reference Book:
1. Hazel Assender and Patrick Grant Cantor, B, ―Aerospace Materials‖, Institute of Physics Publishing Ltd. 2. Autar K. Kaw, ―Mechanics of Composite Materials‖, CRC Press, 2nd Edition, 2005. 3. Dam Ishai., ―Engineering Mechanics of Composite Materials‖, Oxford University Press New Delhi, 2013. 4. P.K.Mallick, ―Fiber-Reinforced Composites: Materials, Manufacturing and Design‖, CRC Press, 3rd Revised Edition, 2007. 5. Allen Baker, ―Composite Materials for Aircraft Structures‖, AIAA Series, 2nd Revised Edition, 2004.
Text Book:
1. Robert M.Jones, ―Mechanics of Composite Materials‖, BS Publication-Hyderabad, 2nd Edition, 1998. 2. Madhujit Mukhopadhyay, ―Mechanics Of Composite Materials and Structures‖, Orient Blackswan Pvt. Ltd - New Delhi, 1st Edition, 2010.
