CE25301 Strength of Materials I – Semester III – Civil – R-2025

Subject Code & Name: CE25301 – Strength of Materials I

Regulation: R-2025

Semester: III (Third Semester)

Branch: B.E. Civil Engineering (Civil)

Credits / L-T-P: 4 Credits | L-T-P: 3-0-2

Course Objectives

• • This course provides a foundational understanding of stress, strain, and deformation in solids, while developing analytical skills to evaluate internal forces, deflections, and torsional behaviour in structural members, springs, and pin-jointed plane trusses.

Full Unit-wise Syllabus

Unit I – Simple Stresses and Strains

Stress–strain concepts, Hooke’s law, elastic constants, stress–strain behavior of materials, axial deformation.

Practical: 1. Tension Test on Mild Steel / HYSD Steel 2. Determination of Elastic Constants (E, G, ν) using bar / torsion tests. 3. Hardness testing of metals using: – Brinell hardness test and Rockwell hardness test

Unit II – Complex Stress Conditions and Mohr's Circle

Uniaxial, biaxial, and triaxial states of stress, thermal stresses in axially loaded composite bars, stresses on inclined planes, principal stresses and planes, Mohr’s circle.

Activities: Prepare a poster explaining construction of Mohr’s circle

Unit III – Shear Force and Bending Moment

Beam types - loads (point load, UDL, UVL, effects of applied moments (concentrated and distributed) - SFD and BMD for cantilever, simply supported, and overhanging beams.

Activities: Review of Competitive exam Questions related to SFD and BMD

Unit IV – Bending and Shear Stresses

Bending theory, bending equation, stress distribution in beams and sections.

Practical: 4. Determination of ultimate shear stress of a mild steel rod by conducting a double shear test.

Unit V – Deflection of Beams

Double integration method - Macaulay’s method - Area moment method - Conjugate beam method for computation of slopes and deflections of determinant beams. 5. Determination of Young’s modulus of a beam with rectangular cross section (metal and wooden specimens) by conducting deflection tests.

Unit VI – Torsion, Springs, and Trusses

Torsion equation and assumptions, analysis of solid and hollow circular shafts, torsional rigidity, combined torsion and bending, shafts in series and parallel; helical springs (open and closed-coiled); analysis of determinate pin-jointed plane trusses using method of joints, sections.

Practical: 6. Open and Closed Coiled Helical Springs – Determine stiffness and deflection under load.

Activities: 1. Plot SFD and BMD for different beam configurations using MS-EXCEL or equivalent open-source simulation tools. 2. Conduct/compile results from key lab tests (tension, torsion, spring test) and interpret material properties and structural behavior. 3. Design a simple structural/mechanical system (e.g., shaft, spring, or truss) considering strength, stiffness, and safety, and justify the design with calculations.

Course Outcomes (COs)

• CO1: Explain stress, strain, material properties, and elastic behavior of solids.
• CO2: Analyze complex stress conditions, thermal stresses, and stress transformation using Mohr’s circle.
• CO3: Evaluate shear force, bending moment, and stress distribution in beams.
• CO4: Apply concepts of torsion, springs, and trusses for structural analysis and design.

Assessment Pattern (Quick Note)

• Weightage: Continuous Assessment 50% | End Semester Examinations 50%
• Internal methodology: Quiz (5%), Project (15%), Assignment Programs (25%), Practical (25%), Internal Examinations (30%)

Source: Official Anna University – B.E. Civil Engineering R-2025 Curriculum
Last Updated: September 2026