Mechanical Engineer®

                      Mohr's Circle • It is a graphical representation of Biaxial (2D) state of stress. • It is a stress circle which is used to determine the normal stress & shear stress on any oblique plane. • Mohr's circle is also used to determine the principal stresses and principal planes location. • With the help of Mohr's circle, in combined state of stress condition, we can determine principal stresses and maximum shear stresses. Sign convention used in Mohr's circle:- 1. On X-axis, we represents normal stress & on Y-axis we represents shear stress. Ex-1:-

  E-BOOKS FOR MECHANICAL ENGINEERING STUDENTS :- Select link then copy it to search in browser or open it directly. HEAT AND MASS TRANSFER ✓ INCROPERA- https://drive.google.com/open?id=0B9bpsTYXP4ceUEgzVHVQLWFDd2s ✓ YUNUS CENGEL- https://drive.google.com/open?id=0B9bpsTYXP4ceWHlDWWlHdEx6aFE ✓ R. K. RAJPUT- https://drive.google.com/open?id=0B9bpsTYXP4cebkg2WF91b25DVFE ✓ P. K. NAG- https://drive.google.com/open?id=0B9bpsTYXP4ceaTJoNFpKS0FzblU ✓ S.K. SOM- https://drive.google.com/open?id=1OhRut4dMEKH9w4w8-Gl8wDR0FfJ-7Fe4 ✓ KOTANDARAMAN- https://drive.google.com/open?id=0B7JWdKw_4Q07dnh5bXk5X0tRV0E ✓ FRANK KREITH- https://drive.google.com/open?id=0B7JWdKw_4Q07UTdOOUpydU51ZWM ✓ VEDAT S. ARPACI- https://drive.google.com/open?id=0B7JWdKw_4Q07TkpDbi1mbnpWUjA ✓ JOHN LIENHARD- https://drive.google.com/open?id=0B7JWdKw_4Q07MGtkTnVMT1FIRFE ✓ J.P. HOLMAN- https://drive.google.com/open?id=0B7JWdKw_4Q07cldUV3RqS2ZTN1k THERMODYNAMICS   ✓ P.K. NAG- https://drive.google.com/open?id=0B9bpsTYXP4ceaGttcWo

 Design Requirement of Machine Elements • A part of a machine that has motion relative to some other parts is called a machine element. Some machine elements may consist several elements; e.g., a ball bearing is a machine element and it consists an inner race, spherical balls, a retaining cage and an outer race. • A machine is as strong and reliable as its weakest element. Remember, a chain breaks at its weakest, link. Same is true for machine element. • The design requirement of a machine element is to ensure that it performs according to the specifications during its stipulated life span. In order to achieve the desired performance, the machine elements should satisfy the following important requirements: Strength, Rigidity , Wear resistance , Corrosion resistance, Ease of lubrication Minimum dimensions, weight and power loss in friction, Safety, Reliability Manufacturability, Maintainability, Conformance to specifications and standards, Minimum initial and life-cycle cost, Minimum L

  Syllabus UNIT-I Introduction • Definition, Design requirements of machine elements, General design procedure, Introduction to Design for Manufacturing, Interchangeability, Limits, Fits and Tolerances, Standards in design, Selection of preferred sizes. Engineering materials and their properties • Classification, Mechanical properties, Ferrous and non-ferrous metals, Nonmetallic materials, Indian Standards designation of carbon & alloy steels, Selection criteria of materials. UNIT-II Design under Static Load • Modes of failure, Factor of safety and basis of determination, Principal stresses, Torsional and bending stresses, Principal stresses in design of machine element, Theory of failure, Eccentric loading. Design under Variable Loads • Cyclic stresses, Fatigue and endurance limit, Factors affecting endurance limit, Stress concentration factor, Stress concentration factor for machine components, Notch sensitivity, Design for finite and infinite life, Soderberg, Goodman & Gerbe