Roberto Guglielmo CITARELLA | MECHANICAL SYSTEMS DESIGN

cod. 0612300012

MECHANICAL SYSTEMS DESIGN

	0612300012
	DIPARTIMENTO DI INGEGNERIA INDUSTRIALE
	EQF6
	MECHANICAL ENGINEERING
	2019/2020

PERCORSO COMUNE Cohort 2017/2018

	OBBLIGATORIO
	YEAR OF COURSE 3
	YEAR OF DIDACTIC SYSTEM 2016
	ANNUALE

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
	VENANZIO GIANNELLA Curriculum

	Objectives
	THE FIRST PART OF THE COURSE IS DEVOTED TO THE DESCRIPTION OF THE PRINCIPAL ASPECTS OF MECHANICAL DESIGN, INCLUDING SOME DETAILS CONCERNING THE OPTIMAL CHOICE OF MATERIALS, MANUFACTURING PROCESSES AND ASSEMBLY. DESIGN APPROACHES, AIMED AT A SIZING OF A NEW COMPONENT OR AT A FAILURE ASSESSMENT OF AN ALREADY EXHISTING COMPONENT, ARE PRESENTED. SOME TOPICS RELATED TO THE MECHANICS OF MATERIALS ARE RECALLED AND EXTENDED WITH THE ALLOWANCE FOR ASPECTS THAT COMPLICATE THE STATIC SOLUTION OF BEAMS (MULTIMATERIAL, INELASTIC DEFORMATIONS DUE TO BENDING LOAD, THREE DIMENSIONAL STATIC PROBLEMS, MOHR'S CIRCLES, TORSION LOAD...). IN THE SECOND PART OF THE COURSE, THE BASIC THEORY PREVIOUSLY PRESENTED IS APPLIED TO THE SIZING OR FAILURE ASSESMENT OF MECHANICAL COMPONENTS 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.

THE FIRST PART OF THE COURSE IS DEVOTED TO THE DESCRIPTION OF THE PRINCIPAL ASPECTS OF MECHANICAL DESIGN, INCLUDING SOME DETAILS CONCERNING THE OPTIMAL CHOICE OF MATERIALS, MANUFACTURING PROCESSES AND ASSEMBLY.
DESIGN APPROACHES, AIMED AT A SIZING OF A NEW COMPONENT OR AT A FAILURE ASSESSMENT OF AN ALREADY EXHISTING COMPONENT, ARE PRESENTED. SOME TOPICS RELATED TO THE MECHANICS OF MATERIALS ARE RECALLED AND EXTENDED WITH THE ALLOWANCE FOR ASPECTS THAT COMPLICATE THE STATIC SOLUTION OF BEAMS (MULTIMATERIAL, INELASTIC DEFORMATIONS DUE TO BENDING LOAD, THREE DIMENSIONAL STATIC PROBLEMS, MOHR'S CIRCLES, TORSION LOAD...).
IN THE SECOND PART OF THE COURSE, THE BASIC THEORY PREVIOUSLY PRESENTED IS APPLIED TO THE SIZING OR FAILURE ASSESMENT OF MECHANICAL COMPONENTS
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 -STRUCTURAL MECHANICS -MANUFACTURING (THIS PREREQUISITE IS OPTIONAL) -MECHANICS OF MACHINES

	Contents
	STRESS/STRAIN ASSESSMENT IN THREEDIMENSIONAL CONFIGURATIONS OF BEAMS UNDERGOING STATIC LOADS. (10 H) • NOTCH EFFECT. (4 H) • STATIC FAILURE CRITERIA FOR BRITTLE AND DUCTILE MATERIALS, WITH ISOTROPIC CONSTITUTIVE LAW. (4 H) • FAILURE ASSESSMENT AND SIZING FOR STRUCTURAL COMPONENTS: DESIGN CRITERIA, SAFETY COEFFICIENTS, COMPLIANCE TO TECHNICAL NORMS. (2 H) • AXIAL-SYMMETRIC ELASTIC PROBLEMS: STRESS/STRAIN ASSESSMENT FOR PRESSURE VESSELS WITH THIN OR THICK WALLS. APPLICATION TO AN INDUSTRIAL VESSEL FOR GPL (10 H) • THERMAL STRESS/STRAINS IN PIPES (FLEXIBLE JOINTS INSERTED AT SPECIFIC PIPE SECTIONS..). (3 H) • UNIAXIAL AND MULTIAXIAL FATIGUE: EFFECT OF COMPONENT SIZE, SURFACE ROUGHNESS, NOTCHES; WHOLER CURVES. CRITERIA AND NORMS FOR FATIGUE FALILURE ASSESSMENT AND SIZING. (25 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); (15 H) - SHAFT AND AXLE (5 H) - BEARINGS (5 H) - SPRING (4 H) - JOINTS (4 H) - GEARS (5 H) - BELTS (4 H) • UNIAXIAL LOW CYCLE FATIGUE (HINTS, 2 H) • UNIAXIAL CREEP (HINTS, 2 H) • THERMOMECHANICAL FATIGUE (HINTS, 2 H) • LINEAR ELASTIC FRACTURE MECHANICS (5 H) • PROJECT: ANALYSIS OF A MECHANICAL ASSEMBLY WITH APPROPRIATE CHOICE OF ITS MAIN COMPONENTS AND RELATED SIZING. (7 H) - VISIT TO THE LABORATORY OF THE MACHINE DESIGN GROUP (2 H)

Contents

STRESS/STRAIN ASSESSMENT IN THREEDIMENSIONAL CONFIGURATIONS OF BEAMS UNDERGOING STATIC LOADS. (10 H)
• NOTCH EFFECT. (4 H)
• STATIC FAILURE CRITERIA FOR BRITTLE AND DUCTILE MATERIALS, WITH ISOTROPIC CONSTITUTIVE LAW. (4 H)
• FAILURE ASSESSMENT AND SIZING FOR STRUCTURAL COMPONENTS: DESIGN CRITERIA, SAFETY COEFFICIENTS, COMPLIANCE TO TECHNICAL NORMS. (2 H)
• AXIAL-SYMMETRIC ELASTIC PROBLEMS: STRESS/STRAIN ASSESSMENT FOR PRESSURE VESSELS WITH THIN OR THICK WALLS. APPLICATION TO AN INDUSTRIAL VESSEL FOR GPL (10 H)
• THERMAL STRESS/STRAINS IN PIPES (FLEXIBLE JOINTS INSERTED AT SPECIFIC PIPE SECTIONS..). (3 H)
• UNIAXIAL AND MULTIAXIAL FATIGUE: EFFECT OF COMPONENT SIZE, SURFACE ROUGHNESS, NOTCHES; WHOLER CURVES. CRITERIA AND NORMS FOR FATIGUE FALILURE ASSESSMENT AND SIZING. (25 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); (15 H)
- SHAFT AND AXLE (5 H)
- BEARINGS (5 H)
- SPRING (4 H)
- JOINTS (4 H)
- GEARS (5 H)
- BELTS (4 H)
• UNIAXIAL LOW CYCLE FATIGUE (HINTS, 2 H)
• UNIAXIAL CREEP (HINTS, 2 H)
• THERMOMECHANICAL FATIGUE (HINTS, 2 H)
• LINEAR ELASTIC FRACTURE MECHANICS (5 H)
• PROJECT: ANALYSIS OF A MECHANICAL ASSEMBLY WITH APPROPRIATE CHOICE OF ITS MAIN COMPONENTS AND RELATED SIZING. (7 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 FULFILLMENT OF THE COURSE OBJECTIVES WILL BE ASSESSED BY A WRITTEN AND AN ORAL EXAMINATION, DEVELOPED IN DIFFERENT DATES. DURING THE ORAL EXAMINATION, IN ADDITION TO ANSWERING TO QUESTIONS CONCERNING THE TOPICS DEVELOPED DURING THE COURSE, THE STUDENTS WILL HAVE TO ILLUSTRATE A TECHNICAL PROJECT THEY HAD PREVIOUSLY DEVELOPED IN A TEAM, ON A TOPIC SUGGESTED BY THE TEACHER.

	Texts
	MECCANICA DEI SOLIDI - AUTHORS: P. BEER, E. R. JOHNSTON JR., J.T. DEWOLF - PUBLISHER: MC-GRAW HILL COSTRUZIONE DI MACCHINE - AUTHORS: ANTONIO DE PAULIS ED ENRICO MANFREDI - PUBLISHER: PEARSON -COSTRUZIONE DI MACCHINE - AUTHORS: BELLONI-LO CONTE - PUBLISHER: HOEPLI

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Roberto Guglielmo CITARELLA | MECHANICAL SYSTEMS DESIGN