Mechanical Eng.1

Page 1: Personal Information

• Assoc. Prof. Tahany William Sadak

• Production Engineering and Design Department

• Faculty of Engineering, Beni–Suef University, Beni–Suef, Egypt.

• Fields of expertise: Mechanical Engineering

Page 2: Introduction to Mechanical Engineering

• Topics Covered:

  • Introduction to Mechanical Engineering

  • Materials Engineering

  • Fundamentals of Mechanical Engineering

  • Mechanical Properties and Specifications of Materials

  • Crystal Structure of Metals and Alloys

• Course Code: MTE102

Page 3: Testing and Materials

• Institutions involved: October 6 University

• Key Areas:

  • Mechanical Testing of Metallic Materials

  • Electrical Properties of Materials

  • Polymer Materials

  • Composite Materials

Page 4: Course Content in Arabic

• مواد الهندسة وأساسيات الهندسة الميكانيكية

• الخواص الميكانيكية للمواد ومواصفاتها

• التركيب البللورى للمعادن والسبائك

• االاختبارات الميكانيكية للمواد المعدنية

• الخواص الكهربية للمواد

• مواد البووليمر

• المواد المركبة

Page 5: Machine Design Process

• Designing Machines:

  • Development of new and improved machines

  • Improving existing machines

• Requirements for Machine Design:

  • Good knowledge of mechanical engineering principles

  • Strong foundation in Mathematics

  • Understanding of Engineering Mechanics

• Resources Needed:

  • Money, manpower, materials

  • Focus on economical designs

Page 6: Stress and Strength of Materials

• Symbols and Concepts:

  • Stress (σ = F/A)

  • Yield and fracture points in materials

  • Linear and non-linear stress-strain relationships

Page 7: Copyright and Workshop Practices

• Copyrighted Material:

  • Reference to third edition Elsevier materials

• Workshop practices:

  • Engineering Drawing

Page 8: Classifications of Machine Design

1. Adaptive Design

• Modifying existing designs into new ideas

2. Development Design

3. New Design

Page 9: General Considerations in Machine Design

• Important Factors:

  1. Type of load and stresses caused

  2. Motion and kinematics of parts

  3. Material selection:

     • Strength, flexibility, heat and corrosion resistance

     • Ability to be cast, welded, or hardened

     • Machinability and electrical conductivity

  • Motion Types:

    • Rectilinear, curvilinear, constant or variable acceleration

Page 10: Additional Machine Design Considerations

• Aspects to Consider:4. Form and size of machine parts5. Friction and lubrication6. Economic features7. Use of standard parts8. Safety in operation9. Workshop facilities10. Production quantity decision11. Construction costs12. Assembly needs

Page 11: Assembly Line Concept

• Introduction to assembly line concepts

Page 12: General Procedure in Machine Design

1. Need or Aim

2. Synthesis of mechanisms

3. Force Analysis

4. Material Selection

5. Design of machine elements (size & stress)

6. Modifications

7. Detailed drawing

8. Production planning

Page 13: Units of Measurement

1. Fundamental Units

2. Derived Units

3. System of Units

4. S.I. Units (International System of Units)

Page 14: Fundamental & Supplementary Units

Page 15: Derived Units

Page 16: Prefixes Used in Basic Units

Page 17: Mass and Weight

• Relations:

  • Weight (W) = mass (m) × gravitational acceleration (g)

  • Example: For a mass of 100 kg, the gravitational force is 981 N.

Page 18: Laws of Motion

1. 1st Law: An object remains at rest or in uniform motion unless acted upon by an external force (Law of Inertia).

2. 2nd Law: The rate of change of momentum is proportional to the applied force (F = m.a).

3. 3rd Law: For every action, there is an equal and opposite reaction.

Page 19: Force and Momentum

• Momentum = Mass × Velocity

• Changes in momentum computed over time:

  • Example given for mass, initial and final velocities.

Page 20: Force Calculation

• The calculations derived from F = m.a

• Example forces including units demonstrated.

Page 21: Units of Force

• Absolute and gravitational units of force:

  • Conversion references between units (e.g., N, lb, kg).

Page 22: Weight of a Body

• Weight defined as the force due to gravity on a mass, example calculation for a mass of 100 kg.

Page 23: Moment of Force

• Moment of a force = F × distance (l)

• Definition of a couple moment.

Page 24: Moments

• Comparison of anti-clockwise and clockwise moments illustrated with an example calculation.

Page 25: Mass Density of Materials

• Table showcasing common materials and their mass densities.

Page 26: Moment of Inertia

• Definitions regarding moment of inertia and its calculation either about a given axis or using the parallel axis theorem.

Page 27: Angular Momentum and Torque

• Definitions provided for angular momentum and torque related to mass moment of inertia and angular velocity.

Page 28: Work Calculation

• Work done (W) is related to force (F) and displacement (d).

• Description of work done under varying conditions, mechanical work on a trolley example.

• Torque's relationship with work in rotational systems.

Page 29: Power Calculation

• Definitions and calculations related to power with factors of time and work input/output efficiency mentioned.

Page 30: Energy Types

1. Potential Energy: Formula given and relevant parameters explained.

2. Strain Energy: Explained through specific examples related to torsional springs.

Page 31: Kinetic Energy Calculation

• Definitions and formulas related to kinetic energy (with focus on rotational dynamics).

Page 32: Energy Conservation

• Total kinetic energy calculation in moving and rotating scenarios, Law of Conservation of Energy principles explained.

Page 33: Energy Forms Transformation

1. Kinetic Energy Accumulation in rotating bodies

2. Comparison of linear and angular motions in energy calculations.

Page 34: Law of Conservation of Energy

• Description of energy transformation without creation/destruction.

• Work done is converted into different forms, including kinetic, potential, and strain energy.

Page 35: Energy Visualization

• Diagram explaining potential energy, kinetic energy, and points in motion (e.g., swing).

Page 36: Classification of Engineering Materials

• Categories of engineering materials:

  • Metals

  • Composites

  • Ceramics

  • Organic materials and Glass

  • Polymers

Page 37: Crystalline Solids Structure

• Crystalline structures focusing on atoms and phases (White tin / Gray tin).

Page 38: Processing, Structure, and Properties

• Overview of the relationship between processing, structure, properties, and performance of materials.

Page 39: Material Properties

• Properties related to strength, stiffness, plasticity, ductility, brittleness, and hardness noted.

Page 40: Stress-Strain Curve

• Illustration of stress-strain behavior for mild steel, including yield points.

Page 41: Failure in Materials

• Overview of failure implications in material properties and stress-strain behavior analysis.

Page 42: Questions

• An invitation for questions regarding the content covered.

Page 43: Conclusion

• Thank you note concluding the material presented.