Syllabus Machine Drawing and Elements of Machine Design - (BE03000231) Total Credits = TH/30 Assessment Pattern and Marks Total Marks Theory Tutorial / Practical ESE(E) PA(M) PA/(I) TW/SL (I) ESE (V) 04 70 30 20 30 50 200 Unit No. Content 1. Basics of stress, strain and machine design : Simple stresses : Tensile, Compressive and Shear, Simple strains : Linear and Lateral, Poisson’s ratio, Stress - Strain diagram for ductile and brittle materials, Hooke’s law, Proportional limit, Elastic limit, Yield, Ultimate and Failure stresses, Modulus of elasticity, Volumetric strain and bulk modulus, Shear strain and Modulus of rigidity, Relations between different constants, Definition and understanding of Machine design, Types of design, Design procedure, Materials Selection in Machine Design, Mechanical Properties of Materials. (Chapter - 1) 2. Moment of inertia of planar cross - sections : Centroid, Center of gravity, moment of inertia of standard lamina using first principle, Radius of gyration, Parallel & perpendicular axes theorems, polar moment of inertia. (Chapter - 2) 3. Theory of bending : Types of beams and loads, bending and deflection, Assumptions, derivation of equation of pure bending, neutral axis, determination of bending stresses, section modulus of rectangular & circular (solid & hollow), I, T, channel sections etc., Bending stresses in levers. (Chapter - 3) 4. Theory of torsion : Torsion, Assumptions, derivation of equation of pure torsion, determination of torsional shear stress, Polar moment of inertia, Polar modulus of solid & hollow circular shaft, power transmission by shaft. (Chapter - 4) 5. Design Against Static Load : Types of loads and stresses of machine elements, Factor of safety, Combined stresses (Principal stress), Theories of Failures, Eccentric Loading, Applications : Design of cotter joint, Knuckle joint and levers etc. (Chapter - 5) 6. Design Against Fluctuating Loads : Stress Concentration, Endurance limit and Fatigue failure, Factors affecting endurance limit, S-N Diagram, Design for reversed stresses and cumulative damage, Fluctuating stresses : Soderberg, Gerber, Goodman and Modified Goodman criteria, Combined stresses. (Chapter - 6) 7. Shafts, Keys and Couplings : Design of solid and hollow circular shaft subjected to torque and Combined loading for rigidity and stiffness; Design of Keys, Design of Flange coupling and Bush Pin type coupling. (Chapter - 7) 8. Power screw : Forms of square threads, terminology of square thread, torque requires lifting and lowering the load, Efficiency of threads, co-efficient of friction, stresses in power screw, Applications : Design of clamp, vise, screw jack, Toggle Jack etc. (Chapter - 8) 9* Elements of Production Drawing Tolerances, Limits and Fits (using any modeling software) : Introduction to generation of drawings as a design process for machine assembly. Use of datum planes to locate features and machine elements uniquely in assemblies. Sectioning, dimensioning, notes and version control in drawings. Standardized representation of threads, fasteners, welds, bearings, springs and related components. Introduction to limits, fits and tolerances, dimensional and geometric tolerances, surface finish symbols. Generation of assembly drawings including sectioning and bill of materials. Evolving details of components from assembly considerations. Detailing of components involving shafts, bearing, pulleys, gears, belts, brackets for assembly. Solid modeling of the above assembly and incorporating assembly constraints for animation of motion of machine assemblies. Principle of isometric projections, Isometric views and Isometric projection of solids. *Sr. No. 9 topics will be covered only in laboratory sessions, and it is part of practical exam
