# Mechanics of Solid Materials – I

Course ID: Engi 4312, Offered in: Spring, Enrollments: 90, Class hours: 3hr/wk

Major Topics

Introduction to Mechanics of Materials and Stress

• Definition of mechanics; Different types of loads/forces; Review of reactions at supports/connections; Equations of forces/moments in equilibrium state
• Internal loadings in solid materials for an external load, Concept of stress; Average normal stress and average shear stress, Allowable stress design for a solid material

Deformation and Strain in Solid Materials

• Effects of an external force, Concept of deformation and strain, Concept of axial and shear strain

Mechanical Properties of Materials

• The tension tests, the stress-strain diagram, Detail inspection of stress-strain diagram
• Concept of Modulus of elasticity (Hook’s law), Yielding, Plastic Deformation, Strain Hardening, Necking, Ductile Materials vs. Brittle materials
• Procedure for Determining Yield Stress for Materials with Non-linear Elastic Behaviors (e.g.; Metal, Plastic)
• Concepts of Permanent set, Strain Energy, Strain Energy Density, Elastic Strain Energy, Modulus of Resilience, Modulus of Toughness, Poisson Ratio, Creep, Fatigue

• Review of stress distribution and Hooke’s law, The Saint-Venant Principle
• Estimating deformation of an axially loaded member (within the elastic region)
• The Principle of Superposition, Statically indeterminate axially loaded member
• How to analyze statically indeterminate axially loaded member, Concepts of Thermal Stress, Stress Concentration and Residual Stress

Effect of Torsional Forces in Structural Materials

• Concept of torsional moment or torque, A brief overview of torsion test, Visualization of torsion force application or torsional effects
• Understanding and estimation of effect (stress and strain) of torsional force on a circular shaft, Review of polar moment of inertia
• Understanding shear stress distribution in a member and its effects; Relationship between power (rate of work) and torque
• Estimation of angle of twist for a torsional force; Sign convention in torsion problem

• Concept of bending/flexural moment, Visualization of bending/flexural effects, Effects of internal loadings in beams
• Detail discussion on methods for determining shear and moment in beams: shear and moment functions method and graphical method
• Understanding of bending deformation in a beam due to bending moment and equation for estimating bending deformation
• Understanding of bending stress (flexure stress) and equation for bending stress (flexure stress), Procedure for determining bending stress in a beam
• Concept of unsymmetrical bending and determining bending stress when moment arbitrarily applied

Concepts and Applications of Transverse Shear Forces

• Concept of transverse and longitudinal shear forces or shear stresses, Understanding shear force and shear stress in straight member, Visualization of transverse shear effects
• Estimating the shear stress in the member at the point located a distance y from the neutral axis
• What will be the shear stress at flange-web junction? Shear stress distribution over the width t at the section, Procedure for estimating shear stress distribution
• Concept of shear flow in a built-up member, Estimating spacing of fastener/tie