**JNTUK R20 2-2 Strength of Materials II Notes and Material PDF Download**

Students taking JNTUK’s R20 Civil Branch Can Download R20 2 Strength of Materials II (SOM-2) Notes and Material PDFs below.

**OBJECTIVES:**

- To explain the concepts of Principal strains and stresses created in the cross-section of beams across the cross-section and the stresses that occur at any inclined plane. To explain concepts of failures in the material by considering various theories.
- To provide ideas of torsion and the governing torsion equation is a way to calculate the force transmitted through springs and shafts and determine the cross-section to be under load using various theories of failure.
- To classify columns, calculate load carrying capacity, assess stresses due to axial and lateral loads for different edge conditions, and calculate the combined effect of direct and bending stresses on other engineering structures.
- Introduce the concept of unsymmetrical bending in beams. Location of neutral axis Deflection of beams under unsymmetrical bending.

**UNIT-1**

**Principal Strains and Stresses and theories of failures**Â Introduction – Strains and stresses on an inclined portion of a bar with tension in the axial direction – compound stresses Normal and tangential stress in a ready plan to create biaxial pressures Two regular perpendicular focus coupled with simple shear, Mohr’s circle of anxiety – principal stress and strains – Analytical as well as graphic solutions.

**Theories of Failure**Â Introduction – Diverse theories of failures, such as the Maximum Principal Stress Theory – The Maximum Principal Stiffness Theory of Maximum Shear Stress Theory of Maximum Strain Energy The idea of maximum shear stress energy.

**UNIT-2**

**The Torsion Effect of Circular Shafts & Springs**Â Theoretical theory of pure torsion. Derivation of the equations for Torsion T/J = Q/R = Nph/L – Hypotheses made within the ideas of torsion pure the moment of torsion – Modulus of the Polar Section – Power transmission through shafts – Combination of bent and torsion, as well as end thrust design of beams according on theories about failure.

**Springs**Â The basics of the spring – deflections of open and closed springs coiled in helical coils with axial pull and the axial couple. Springs are in parallel and series.

**UNIT-3**

**Struts and Columns**Â Introduction Types of columns Medium, short and long columns Axially loaded compression members crushing load – Euler’s theorem to describe long queues – assumptions – the derivation of Euler’s critical load’s formulae for different conditions at the end and conditions. The equivalent length of columns – slenderness ratio Euler’s significant limitations of the stress of Euler’s theories – Rankine and the Gordon formula for long queues that have been subjected to eccentric load The following procedures are used to calculate unorthodox loading Secant formula Empirical formulae – Straight lines formula. Prof. Perry’s equation.

**Unit-3 Materials PDF Download**

**UNIT-4**

**B.M. and Direct Stresses**Â Stresses result from the directly loaded and B.M. Section’s core – determination of the stresses for chimneys, walls of retaining, and dams – stability conditions and stability. Pressures result from direct load and B.M. around both axes.

**UNIT-5**

**Unsymmetrical Bending and Shear Centre Unsymmetrical The Bending process:**Â Introduction – Centroidal principal axes of section Graphical method of locating main axes – Moments in inertia related to any of the rectangular axes – The effects of stress in beams which are subject to unsymmetrical bending Axis – Resolution of bend moments into rectangular axes along the centroid. Location of the neutral axis deflection of beams in unsymmetrical bent.

**Shear Center:**Â Introduction Shear center for unsymmetrical and symmetrical sections (channel I, T, and L section)

**Textbooks:**

- A Textbook on the Strength of Materials, written composed by R. K. Rajput 7th edition (Mechanics of Solids) SI Units S. Chand & Co New Delhi
- Materials’ strength from R. K. Bansal, LakshmiPublications.

**REFERENCE books:**

- “Object-Mechanics of Materials” written by R. C.Hibbler, Pearson publishers
- The Mechanics of Solids – E P Popov, Prentice Hall.
- The Strength of Materials B.S.Basavarajaiah and P. Mahadevappa, 3rd Edition, Universities Press.
- Mechanical Mechanics of Structures Vol – I by H.J.Shah and S.B.Junnarkar Charotar Publishing House. Ltd. analysis and design with UML”, Mahesh P. Matha PHI

**OUTCOMES:**

- The student will grasp the fundamental concepts of the principal stresses created within a component exposed to stress along various axes and design the sections.
- The student can assess the stresses in various engineering processes like springs, shafts, columns, and struts, which are subjected to load conditions.