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FUNDAMENTALS OF MACHINE DESIGN

CODE 94800
ACADEMIC YEAR 2022/2023
CREDITS
  • 5 cfu during the 2nd year of 8784 INGEGNERIA MECCANICA (L-9) - LA SPEZIA
  • SCIENTIFIC DISCIPLINARY SECTOR ING-IND/14
    LANGUAGE Italian
    TEACHING LOCATION
  • LA SPEZIA
  • SEMESTER 2° Semester
    TEACHING MATERIALS AULAWEB

    OVERVIEW

    The course aims to provide students of the knowledge and understanding of the criteria of structural design

    for static strength

    AIMS AND CONTENT

    LEARNING OUTCOMES

    The course aims to provide students of the knowledge and understanding of the criteria of structural design

    for static strength

    AIMS AND LEARNING OUTCOMES

    The course aims to provide students with methodologies and analytical tools for the study of the state of tension / deformation in solids and structures for the purpose of evaluating resistance in the static field, with particular reference to the mechanical elements attributable to the "beam ".

    Attendance to lectures and guided exercises and individual study will allow the student to:

     

    • learn the general aspects of Structural Mechanics, in the meaning of an analytical study of the rigid and deformable body
    • learn computation methods with the aim of studying solid mechanics models of increasing complexity,
    • achieve an excellent ability to analyze both the static equilibrium of rigid and deformable bodies and the relative state of tension / deformation, with particular reference to models of traviform solids, when subjected to static load conditions variously combined
    • acquire the ability to extend the principles learned to structures composed of various beams
    • master the use of the mechanical characteristics of the materials most used in the mechanical and structural fields with static loads

    TEACHING METHODS

    The lectures, together with the development of numerous exercises, also in the form of guided exercises, provide the student with a logical and orderly method to follow in the applications of the theory. All the examples / exercises solved use this methodology in order to favor a good assimilation of the theoretical principles, proceeding step by step from the simple example to the more complex and articulated one. The student also achieves a good experience in solving various problems. Starting from the fundamental concepts of stress and strain, the student are encouraged to analyze the experimental behavior of materials, with special reference to materials typically used in engineering, by using photos, experimental samples, videos.

    SYLLABUS/CONTENT

    Mechanics of solids and structures: forces and moments; equilibrium of deformable body; articulated assemblages of rigid members

    Stresses and strains in solids . Principal stresses . Mohr's Mohr's circle plane stress

    Special problems of structural mechanics: Beam theory

    Materials: Steels and Cast irons; Classification. 

    Mechanical properties of materials: tension and compression test; stress-strain diagram; stress-strain behavior of ductile and brittle materials; Hooke's law; Poisson's ratio; shear stress-strain diagram.

    Axial load: Saint-venant's Principle; Principle of superposition

    Torsion: torsional deformation of a circular shat, angle of twist; solid noncircular beams; thin-walled bams

    Bending: shear and moment diagrams and graphical method for constructing ; bending deformation of a straight member; flexure formula; unsymmetric bending 

    Transverse shear: shear in straight members; shear formula

    Static strength of materials. Ideal or equivalent stress. Strength criteria for ductile materials. Safety condition: Limit stress, Safety factor, Admissible stress.

     

    RECOMMENDED READING/BIBLIOGRAPHY

    Russell C. Hibbeler "Mechanics of Materials"  ,9th edition , Pearson Education - 2013

    TEACHERS AND EXAM BOARD

    Exam Board

    MARGHERITA MONTI (President)

    FRANCESCO CRENNA

    ROBERTO RAZZOLI

    FLAVIA LIBONATI (President Substitute)

    LESSONS

    Class schedule

    All class schedules are posted on the EasyAcademy portal.

    EXAMS

    EXAM DESCRIPTION

    The exam includes a written test and an oral test.

    The written test consists of an exercise to be solved within 2 hours. During the test, only the use of the calculator is allowed. Smartphones have to be switched off.

    Those who obtain a score of at least 18/30 for the written test can access the oral exam. Those who do not pass the written test have to repeat it in any official scheduled date.

    The oral exam, which can be held within a calendar year after passing the written test, includes two questions: questions relating to the theoretical part developed during the lessons and / or the written test, as a critical comment.

    A failed oral exam does not invalidate the written test which can be reused in the future (within one year).

    The final mark is given by the average of the marks of the oral and written tests: if it is a decimal, it is rounded to the upper unit.

    ASSESSMENT METHODS

    The written test assesses the student's ability to:

    • correctly calculate the area properties of proposed figures, often schematic pattern of real elements
    • analyze the appropriate constraints and their effectiveness
    • analyze the loads acting on the structure
    • draw the characteristics of stress in specific sections
    • identify the most stressed areas
    • dimension the critical areas by choosing the right material

    The oral exam focuses on the topics faced during the lectures and aims to assess to which extent the student:

    • has assimilated an adequate level of knowledge about Structural Mechanics
    • has acquired the ability to logically face problems that will be posed during the test
    • can illustrate theories and solve problems
    • expresses his thinking clearly
    • uses appropriate terminology
    • uses a methodological approach oriented to analyze the experimental behavior of materials, with special reference to materials typically used in engineering

    Exam schedule

    Date Time Location Type Notes