Roberto Guglielmo CITARELLA | MECHANICAL SYSTEMS DESIGN

cod. 0612300012

MECHANICAL SYSTEMS DESIGN

	0612300012
	DIPARTIMENTO DI INGEGNERIA INDUSTRIALE
	EQF6
	MECHANICAL ENGINEERING
	2022/2023

PERCORSO IN COMMON

	OBBLIGATORIO
	YEAR OF COURSE 3
	YEAR OF DIDACTIC SYSTEM 2018
	FULL ACADEMIC YEAR

TEACHING UNITS

	SSD	CFU	HOURS	ACTIVITY	TYPE OF ACTIVITY
	ING-IND/14	12	120	LESSONS	COMPULSORY SUBJECTS, CHARACTERISTIC OF THE CLASS

PROFESSORS

	ROBERTO GUGLIELMO CITARELLA T Curriculum
	RAFFAELE SEPE Curriculum

	Objectives
	STUDENTS WILL LEARN HOW TO CRITICALLY ANALYSE THE STRUCTURAL RESISTENCE OF MACHINE COMPONENTS, UNDERGOING STATIC AND FATIGUE LOADS. IN PARTICULAR, THE STUDENT WILL LEARN HOW TO: - ANALYSE THE MECHANICAL BEHAVIOUR OF STRUCTURES UNDERGOING STATIC OR DYNAMIC LOADS; - CALCULATE STRESSES AND DISPLACEMENTS IN SIMPLE STRUCTURAL COMPONENTS (BEAMS, SHAFT, ETC.) AND POINT OUT THE CORRESPONDING SAFETY MARGIN; - ASSESS THE STRUCTURAL RESISTANCE OF MECHANICAL COMPONENTS UNDERGOING STATIC, THERMAL AND FATIGUE LOADS; - SIZE A MECHANICAL COMPONENT, CONSIDERED AS PART OF A COMPLEX ASSEMBLY, IN COMPLIANCE WITH DESIGN CONSTRAINTS AND TECHNICAL NORMS; - APPLY DIAGNOSIS TECHNIQUES FOR FAILURE MODE ASSESSMENT IN A MECHANICAL COMPONENT AND SCHEDULE THE NEEDED MAINTENANCE; - ANALYSE THE DAMAGING PHENOMENA UNDERMINING IN SERVICE FUNCTIONAL PERFORMANCES OF MATERIALS USED IN ENGINEERING APPLICATIONS, WITH ALLOWANCE FOR THEIR MUTUAL INTERDEPENDENCE, MICROSTRUCTURE AND APPLIED HEAT/MECHANICAL TREATMENTS. THE MAIN SKILLS DEVELOPED BY THE STUDENTS WILL BE DEPLOYED IN A GROUP WORK AIMED AT DESIGNING A COMPLEX MECHANICAL ASSEMBLY, WITH CONSIDERATION OF ALL THE PREVIOUSLY MENTIONED ASPECTS.

STUDENTS WILL LEARN HOW TO CRITICALLY ANALYSE THE STRUCTURAL RESISTENCE OF MACHINE COMPONENTS, UNDERGOING STATIC AND FATIGUE LOADS.
IN PARTICULAR, THE STUDENT WILL LEARN HOW TO:
- ANALYSE THE MECHANICAL BEHAVIOUR OF STRUCTURES UNDERGOING STATIC OR DYNAMIC LOADS;
- CALCULATE STRESSES AND DISPLACEMENTS IN SIMPLE STRUCTURAL COMPONENTS (BEAMS, SHAFT, ETC.) AND POINT OUT THE CORRESPONDING SAFETY MARGIN;
- ASSESS THE STRUCTURAL RESISTANCE OF MECHANICAL COMPONENTS UNDERGOING STATIC, THERMAL AND FATIGUE LOADS;
- SIZE A MECHANICAL COMPONENT, CONSIDERED AS PART OF A COMPLEX ASSEMBLY, IN COMPLIANCE WITH DESIGN CONSTRAINTS AND TECHNICAL NORMS;
- APPLY DIAGNOSIS TECHNIQUES FOR FAILURE MODE ASSESSMENT IN A MECHANICAL COMPONENT AND SCHEDULE THE NEEDED MAINTENANCE;
- ANALYSE THE DAMAGING PHENOMENA UNDERMINING IN SERVICE FUNCTIONAL PERFORMANCES OF MATERIALS USED IN ENGINEERING APPLICATIONS, WITH ALLOWANCE FOR THEIR MUTUAL INTERDEPENDENCE, MICROSTRUCTURE AND APPLIED HEAT/MECHANICAL TREATMENTS.
THE MAIN SKILLS DEVELOPED BY THE STUDENTS WILL BE DEPLOYED IN A GROUP WORK AIMED AT DESIGNING A COMPLEX MECHANICAL ASSEMBLY, WITH CONSIDERATION OF ALL THE PREVIOUSLY MENTIONED ASPECTS.

	Prerequisites
	AS A PREREQUISITE TO PROPERLY BENEFIT OF THE COURSE CONTENT, STUDENTS MUST OVERCOME EXAMINATIONS IN THE FOLLOWING PROPEDEUTIC COURSES: -TECHNICAL DRAWING -RATIONAL MECHANICS AND STRUCTURAL MECHANICS -MANUFACTURING (THIS PREREQUISITE IS OPTIONAL) -MECHANICS OF MACHINES

	Contents
	FIRST SEMESTER STRESS/STRAIN ASSESSMENT IN THREE-DIMENSIONAL CONFIGURATIONS OF BEAMS UNDERGOING STATIC LOADS. (7 H) • STATIC FAILURE CRITERIA FOR BRITTLE AND DUCTILE MATERIALS, WITH ISOTROPIC CONSTITUTIVE LAW, FAILURE ASSESSMENT AND SIZING FOR STRUCTURAL COMPONENTS: DESIGN CRITERIA, SAFETY COEFFICIENTS, COMPLIANCE TO TECHNICAL STANDARDS. (6 H) • MOHR CIRCLE, ENERGETIC CRITERIA (10 H) • BUCKLING, EULERIAN CRITICAL LOAD OMEGA METHOD (5 H) • CURVED BAR (4H) • NOTCH EFFECT. (12 H) • LINEAR ELASTIC FRACTURE MECHANICS (6 H) • AXIAL-SYMMETRIC ELASTIC PROBLEMS: STRESS/STRAIN ASSESSMENT FOR PRESSURE VESSELS WITH THIN OR THICK WALLS. (10 H) SECOND SEMESTER • UNIAXIAL AND MULTIAXIAL FATIGUE: EFFECT OF COMPONENT SIZE, SURFACE ROUGHNESS, NOTCHES; WHOLER CURVES. CRITERIA AND NORMS FOR FATIGUE FALILURE ASSESSMENT AND SIZING. (14 H) • FUNCTIONAL MODE, FAILURE ASSESSMENT AND SIZING OF: - NON REMOVABLE (RIVETING, WELDING, BONDING) AND REMOVABLE JOINT COMPONENTS (COMPONENTS FIT TOGETHER, FEATHER KEY, TABS, SPLINED SHAFT, BOLTS, MANOUVRE AND POWER SCREW); (8 H) - SHAFT AND AXLE (4 H) - BEARINGS (6 H) - SPRING (2H) - JOINTS (2 H) - GEARS (8 H) - BELTS (4 H) • LINEAR ELASTIC FRACTURE MECHANICS (2 H) • PROJECT: ANALYSIS OF A MECHANICAL ASSEMBLY WITH APPROPRIATE CHOICE OF ITS MAIN COMPONENTS AND RELATED SIZING. (8 H) • VISIT TO THE LABORATORY OF THE MACHINE DESIGN GROUP (2 H)

Contents

FIRST SEMESTER
STRESS/STRAIN ASSESSMENT IN THREE-DIMENSIONAL CONFIGURATIONS OF BEAMS UNDERGOING STATIC LOADS. (7 H)
• STATIC FAILURE CRITERIA FOR BRITTLE AND DUCTILE MATERIALS, WITH ISOTROPIC CONSTITUTIVE LAW, FAILURE ASSESSMENT AND SIZING FOR STRUCTURAL COMPONENTS: DESIGN CRITERIA, SAFETY COEFFICIENTS, COMPLIANCE TO TECHNICAL STANDARDS. (6 H)
• MOHR CIRCLE, ENERGETIC CRITERIA (10 H)
• BUCKLING, EULERIAN CRITICAL LOAD OMEGA METHOD (5 H)
• CURVED BAR (4H)
• NOTCH EFFECT. (12 H)
• LINEAR ELASTIC FRACTURE MECHANICS (6 H)
• AXIAL-SYMMETRIC ELASTIC PROBLEMS: STRESS/STRAIN ASSESSMENT FOR PRESSURE VESSELS WITH THIN OR THICK WALLS. (10 H)

SECOND SEMESTER
• UNIAXIAL AND MULTIAXIAL FATIGUE: EFFECT OF COMPONENT SIZE, SURFACE ROUGHNESS, NOTCHES; WHOLER CURVES. CRITERIA AND NORMS FOR FATIGUE FALILURE ASSESSMENT AND SIZING. (14 H)
• FUNCTIONAL MODE, FAILURE ASSESSMENT AND SIZING OF:
- NON REMOVABLE (RIVETING, WELDING, BONDING) AND REMOVABLE JOINT COMPONENTS (COMPONENTS FIT TOGETHER, FEATHER KEY, TABS, SPLINED SHAFT, BOLTS, MANOUVRE AND POWER SCREW); (8 H)
- SHAFT AND AXLE (4 H)
- BEARINGS (6 H)
- SPRING (2H)
- JOINTS (2 H)
- GEARS (8 H)
- BELTS (4 H)
• LINEAR ELASTIC FRACTURE MECHANICS (2 H)
• PROJECT: ANALYSIS OF A MECHANICAL ASSEMBLY WITH APPROPRIATE CHOICE OF ITS MAIN COMPONENTS AND RELATED SIZING. (8 H)
• VISIT TO THE LABORATORY OF THE MACHINE DESIGN GROUP (2 H)

	Teaching Methods
	THE COURSE IS BASED ON 120 HOURS OF THEORETICAL AND APPLICATIVE LESSONS (12 CFU). IN PARTICULAR, 2 OUT OF 120 HOURS ARE SPENT IN THE LABORATORY OF THE MACHINE DESIGN GROUP WHERE THE AVAILABLE STATIC AND FATIGUE MACHINES WILL BE ILLUSTRATED TO THE STUDENTS; THE REMAINING 118 HOURS WILL BE EROGATED IN THE CLASS ROOM AND SPLIT IN 80 HOURS OF THEORY AND 38 OF APPLICATIONS (EXERCISES)

	Verification of learning
	THE ACHIEVEMENT OF THE TEACHING OBJECTIVES IS CERTIFIED BY PASSING AN EXAM WHICH IS BASED ON A WRITTEN AND AN ORAL EXAM. THE DATE OF THE WRITTEN EXAM IS SCHEDULED, WHILE THE DATE OF THE ORAL EXAM IS DEFINED BY THE TEACHER FROM TIME TO TIME (TAKING INTO ACCOUNT THE SCHEDULING OF THE OTHER EXAMS OF THE III YEAR, II SEMESTER). IN ORAL TEST THE STUDENT WILL ANSWER: ASPECTS INHERENT TO THE PROJECT, WHICH, EVEN IF CARRIED OUT IN GROUPS, WILL BE DISCUSSED INDIVIDUALLY; ASPECTS INHERENT TO THE WRITTEN TEST; THEORETICAL QUESTIONS CONCERNING THE WHOLE OF THE PROGRAM. THE WRITTEN TEST IS BASED ON THE NUMERICAL RESOLUTION OF AN EXERCISE ON THE VERIFICATION/FATIGUE DESIGN OF MECHANICAL COMPONENTS OR ASSEMBLIES AND IS PREPARATORY FOR ACCESS TO THE RELATED ORAL TEST. THE WRITTEN TEST REMAINS VALID WITHIN THE EXAM SESSION IN WHICH IT IS PASSED. WITH REFERENCE TO THE PROJECT RELATED TO THE SECOND PART OF THE EXAM WE SPECIFY THE FOLLOWING: 1)EACH GROUP OF STUDENTS, COMPOSED OF A MAXIMUM OF FOUR STUDENTS, AT THE BEGINNING OF THE SECOND SEMESTER IS ASSIGNED AN EXERCISE TOPIC CONSISTING OF A MACHINE OR A FUNCTIONAL GROUP OF MACHINE ORGANS; 2) EACH GROUP RECEIVES TOGETHER WITH THE ESSENTIAL DATA FOR THE DESIGN A GRAPHIC SCHEME OF THE OBJECT TO BE DRAWN. WHEN THE TEACHER CONSIDERS THAT THE THEME HAS BEEN EXHAUSTIVELY AND CORRECTLY CARRIED OUT, HE/SHE WILL DATE AND SIGN THE WRITTEN REPORT AND ALL THE TABLES OF THE GRAPHIC REPRESENTATION. 3) THE COMPLETION BY THE END OF THE CURRENT ACADEMIC YEAR OF THE ASSIGNED THEME, PROVEN BY THE TEACHER'S SIGNATURE, ENTITLES THE STUDENT TO BE ADMITTED TO THE EXAM IN THE SESSIONS OF THE CURRENT AND FOLLOWING ACADEMIC YEAR. THE STUDENT WHO FAILS TO DEVELOP THE PROJECT BY THE END OF THE ACADEMIC YEAR, WILL BE ASSIGNED A NEW TRACK AT THE BEGINNING OF THE SECOND SEMESTER OF THE FOLLOWING YEAR. FUNDAMENTAL IN THE FORMATION OF THE GRADE IS THE ABILITY 'TO REASON EXHIBITED BY THE STUDENT ON THE TOPICS PROVIDED TO THE COURSE. AMONG THE MINIMUM REQUIREMENTS FOR PASSING THE EXAM, A RELEVANT ROLE IS ATTRIBUTED TO THE ABILITY TO SOLVE STATIC AND UNIAXIAL AND MULTIAXIAL FATIGUE OF ELEMENTARY STRUCTURES, WITH REFERENCE, AMONG OTHER THINGS, TO "REASONABLE" NUMERICAL EVALUATIONS (E.G., ARE PARTICULARLY SERIOUS ERRORS OF ORDERS OF MAGNITUDE, WITHOUT THE STUDENT NOTICING IT, ON THE NUMERICAL QUESTIONS PROPOSED). THE FINAL GRADE IS AN AVERAGE OF THE GRADES OBTAINED IN THE TWO PARTS OF THE EXAM.

Verification of learning

THE ACHIEVEMENT OF THE TEACHING OBJECTIVES IS CERTIFIED BY PASSING AN EXAM WHICH IS BASED ON A WRITTEN AND AN ORAL EXAM.
THE DATE OF THE WRITTEN EXAM IS SCHEDULED, WHILE THE DATE OF THE ORAL EXAM IS DEFINED BY THE TEACHER FROM TIME TO TIME (TAKING INTO ACCOUNT THE SCHEDULING OF THE OTHER EXAMS OF THE III YEAR, II SEMESTER).
IN ORAL TEST THE STUDENT WILL ANSWER: ASPECTS INHERENT TO THE PROJECT, WHICH, EVEN IF CARRIED OUT IN GROUPS, WILL BE DISCUSSED INDIVIDUALLY; ASPECTS INHERENT TO THE WRITTEN TEST; THEORETICAL QUESTIONS CONCERNING THE WHOLE OF THE PROGRAM.
THE WRITTEN TEST IS BASED ON THE NUMERICAL RESOLUTION OF AN EXERCISE ON THE VERIFICATION/FATIGUE DESIGN OF MECHANICAL COMPONENTS OR ASSEMBLIES AND IS PREPARATORY FOR ACCESS TO THE RELATED ORAL TEST.
THE WRITTEN TEST REMAINS VALID WITHIN THE EXAM SESSION IN WHICH IT IS PASSED.
WITH REFERENCE TO THE PROJECT RELATED TO THE SECOND PART OF THE EXAM WE SPECIFY THE FOLLOWING:
1)EACH GROUP OF STUDENTS, COMPOSED OF A MAXIMUM OF FOUR STUDENTS, AT THE BEGINNING OF THE SECOND SEMESTER IS ASSIGNED AN EXERCISE TOPIC CONSISTING OF A MACHINE OR A FUNCTIONAL GROUP OF MACHINE ORGANS;
2) EACH GROUP RECEIVES TOGETHER WITH THE ESSENTIAL DATA FOR THE DESIGN A GRAPHIC SCHEME OF THE OBJECT TO BE DRAWN. WHEN THE TEACHER CONSIDERS THAT THE THEME HAS BEEN EXHAUSTIVELY AND CORRECTLY CARRIED OUT, HE/SHE WILL DATE AND SIGN THE WRITTEN REPORT AND ALL THE TABLES OF THE GRAPHIC REPRESENTATION.
3) THE COMPLETION BY THE END OF THE CURRENT ACADEMIC YEAR OF THE ASSIGNED THEME, PROVEN BY THE TEACHER'S SIGNATURE, ENTITLES THE STUDENT TO BE ADMITTED TO THE EXAM IN THE SESSIONS OF THE CURRENT AND FOLLOWING ACADEMIC YEAR. THE STUDENT WHO FAILS TO DEVELOP THE PROJECT BY THE END OF THE ACADEMIC YEAR, WILL BE ASSIGNED A NEW TRACK AT THE BEGINNING OF THE SECOND SEMESTER OF THE FOLLOWING YEAR.
FUNDAMENTAL IN THE FORMATION OF THE GRADE IS THE ABILITY 'TO REASON EXHIBITED BY THE STUDENT ON THE TOPICS PROVIDED TO THE COURSE.
AMONG THE MINIMUM REQUIREMENTS FOR PASSING THE EXAM, A RELEVANT ROLE IS ATTRIBUTED TO THE ABILITY TO SOLVE STATIC AND UNIAXIAL AND MULTIAXIAL FATIGUE OF ELEMENTARY STRUCTURES, WITH REFERENCE, AMONG OTHER THINGS, TO "REASONABLE" NUMERICAL EVALUATIONS (E.G., ARE PARTICULARLY SERIOUS ERRORS OF ORDERS OF MAGNITUDE, WITHOUT THE STUDENT NOTICING IT, ON THE NUMERICAL QUESTIONS PROPOSED).
THE FINAL GRADE IS AN AVERAGE OF THE GRADES OBTAINED IN THE TWO PARTS OF THE EXAM.

	Texts
	MECCANICA DEI SOLIDI - AUTHORS: P. BEER, E. R. JOHNSTON JR., J.T. DEWOLF - PUBLISHER: MC-GRAW HILL -COSTRUZIONE DI MACCHINE - AUTHORS: BELLONI-LO CONTE - PUBLISHER: HOEPLI MANUALE DEGLI ORGANI DELLE MACCHINE AUTHORS: G. NIEMANN, H. WINTER, B.R. HOHN. PUBLISHER: TECNICHE NUOVE NOTES: DIAGRAMS, TABLES, FORMULAE

	More Information
	SUBJECT DELIVERED IN ITALIAN.

BETA VERSION Data source ESSE3 [Ultima Sincronizzazione: 2024-08-21]

Roberto Guglielmo CITARELLA | MECHANICAL SYSTEMS DESIGN