Section outline

    • Questions

       

      Theory of plasticity

      1. Definition of Stress and Strain. Types of stress and strain.
      2. Definition of the State of Stress at a Point. Stress tensor, deviatoric state of stress, mean stress, principal stresses. Tensor invariants.
      3. Engineering and true stress-strain diagrams
      4. Types of stress-strain diagram. Bauschinger effect
      5. Yield criteria, assumptions.             Geometrical interpretation
      6. Laws of conservation and their application in metalworking science.
      7. Engineering stress, tension and compression tests, requirements.
      8. Idealized stress-strain curves and their empirical equations.
      9. Approximate methods – upper bound, slip line, finite element method

      Metalworking engineering

      1. Importance of metalworking in aircraft  manufacturing. Aircraft parts produced by metalworking. Particularities of metalworking processes and their classification.
      2. Heating of metal before PMW. Temperature interval of heat treatment. Types of heat treatment.
      3. Processes and equipment for metal heating before plastic deformation and their comparison.
      4. Principles of classification of metalworking processes. Classification of metalworking processes.
      5. Classification of the equipment for plastic metal working.
      6. Forging and die-forging hammers, their basic characteristics. Counterblow hammers.
      7. Presses, their basic characteristics.
      8. Rolling. Equipment and products.
      9. Extrusion. Classification, main parameters.
      10. Wire and rod drawing. Process variables, die design.
      11. Open-die forging. Application, advantages. Basic Open-die forging operations.
      12. Extrusion. Practice, typical defects
      13. Main operation of the forging. Main stages of forging process planning.
      14. Upsetting and heading. Upsetting practice. Cogging, drawing out, breaking dawn.
      15. Close-die forging. Classification. Comparison of the open-die and close-die forging.
      16. Open-die forging. Bending. Piercing and punching
      17. Design of forging drawing. Selection of parting plane. Edge and fillet radiuses.
      18. Stages of close-die forging process. Flash at close-die forging and its function.
      19. Design of forging drawing. Allowances, tolerances and flooding.
      20. Multy-cavity close-die forging. Types of preliminary impressions
      21.  Determination of a quantity and types of preliminary impressions for  multy-cavity close-die forging. Mass distribution diagram
      22. Closed die forging without flash
      23. Typical Forging operation Sequence.
      24. Auxiliary operations for forging
      25. Forging defects
      26. Specialized metalworking processes. Orbital forging, radial forging, roll forging, horizontal upsetting.