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Mechanical Engineering - Machine Design 2

Machine Design 2


Synthetic program:

COSTRUZIONE DI MACCHINE 2
I principali contenuti del corso sono:
• Analisi stato di sforzo 3D in componenti meccanici complessi
• Il passaggio dal calcolo strutturale alla verifica di resistenza statica ed a fatica
• I criteri di accettabilità di elementi con difetti
• Applicazioni a componenti e strutture meccaniche.

Structural Analysis.
Statically undetermined systems: Force Method Axisymmetric problems: Thin and Thick Cylinders loaded by internal and external pressure and centrifugal loads. Finite element modelling: basic formulation, definition of stiffness matrix, main shape functions, selection of element types, load and boundary conditions, evaluation of results, type of analysis (static, dynamic, etc.)

Strength of materials and assessment criteria
3D state of stress, multiaxial failure theories Cyclic response of materials: High Cycle Fatigue. Endurance limit, Fatigue strength, Modifying factors, Stress Concentration and Notch Sensitivity, Multiaxial Fatigue, Variable Amplitude loading, Cumulative Fatigue damage Linear Elastic Fracture Mechanics: energy approach (Griffith), Stress Intensity Factor, KIC, Fatigue Crack. Propagation

Design of Machine Elements
Shaft and Shaft Components. Materials, layout, design for stress, deflections, critical speeds, components, fits. Welding and the Design of Permanent Joints. Stresses in Welded Joints, Strength of Welded Joints.

Case Studies
The first case study will be based either on Railway Axle application or on a Power Transmission Gearbox application depending on the class. In both cases it will include General Analysis, Design of Shafts, Shrink Fits and Fatigue Assessment.
The second case study will be a Pressure Vessel, with the Validation of Analytical Methods by Means of FEM analysis and Lab Tests.

Lecture Notes

Complete course:

Type File name Year
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Divided by topic:

Type File name Year
Digital notes Part 1 (Schemi statici, schemi a travi e sistemi iperstatici. Molle. Stato di sforzo e deformazione. Intagli. Unioni bullonate.) 2011/2012
Digital notes Part 2 (Criteri di cedimento e verifiche di resistenza. Problemi assialsimmetrici. Giunzioni saldate. Accoppiamento forzato. Meccanica della frattura.) 2011/2012
Digital notes Part 3 (Fatica nei materiali e resistenza a fatica. Fatica multiassiale. Fatica oligociclica. Fatica a carichi variabili. Propagazione della cricca di fatica. Lastre e gusci. Cilindri a piccolo spesso 2011/2012
Digital notes Strutture iperstatiche 2018/2019

Other:

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Exercises

Complete course:

Type File name Year
Handwritten notes Exercises of the course 2019/2020

Divided by topic:

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Other:

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Exams

First partial exam:

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Second partial exam:

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Full exam:

Type Date
Text 04/07/2011
Text 21/07/2011
Text 05/09/2011
Text 22/09/2011
Text 09/07/2012
Text 10/09/2012
Text 12/11/2012
Text 19/06/2013
Text 09/09/2013
Text 20/09/2013
Text 25/06/2014
Text 08/07/2014
Text 07/07/2015
Text 07/09/2015
Text 18/09/2015
Text 05/07/2016
Text 22/07/2016
Text 08/09/2016
Text 20/09/2016
Text 24/11/2016
Text 08/09/2017
Text 07/02/2017
Text 26/06/2018
Text 16/07/2019
Text 10/09/2020

Oral exam:

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Multiple choice test:

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Other:

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Other

Laboratory:

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Projects:

File name Year
Hydraulic Actuator 2018/2019
Pressure vessel 2018/2019
Railway axle 2018/2019

Presentations:

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Collections of notes, exercises or exams:

File name Year
Raccolta temi 1990-1994

Tables:

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Etc:

Live

Quick daily notes, exercises and audio recordings. Files will be approved on priority but deleted after 365 days. 2 points will be assigned by default.

Quick contents:

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