NON DESTRUCTIVE EVALUATION ON MECHANICAL ELEMENTS

Academic Year 2023/2024 - Teacher: Fabio Raffaele Emilio An LO SAVIO

Expected Learning Outcomes

The course aims to provide basic knowledge of non-destructive checks to be carried out on mechanical devices or individual parts of them during construction or operation. The presence of discontinuities and defects generated during the foundry, casting, welding processes or during the useful life of the mechanical elements will be analyzed. The student engineer will be instructed on the most significant aspects of non-destructive testing methods ranging from visual inspection to the most refined radioscopic methods. The course also includes laboratory exercises with examples of the use of some of the most common methods.

Course Structure

The course will be structured as follows: the initial phase includes an introduction to the defects generated during the manufacturing processes in the furnace, casting, cold or hot plastic processing of metal elements. On defects produced during various welding methods, during mechanical processing or during the useful life of mechanical elements. The main test methods for identifying the defects described without causing the element under examination to break are subsequently analysed. During the course, exercises will be carried out in the classroom or in the laboratory.

Required Prerequisites

To better understand the contents of Non destructive evaluation on mechanical elements, at the beginning of the teaching activities the student should possess knowledge ("cultural" propaedeutics) of metallurgy. There are no "formal" preparatory steps.

Attendance of Lessons

Mandatory attendance.

Detailed Course Content

Description of defects generated during manufacturing processes in the furnace, casting, cold or hot plastic processing of metal elements.

Description of defects produced during various welding methods, during mechanical processing or during the operation of mechanical elements.

Analysis of the following non-destructive test methods for the identification of defects: Visual inspection, Liquid penetrants, Magnetoscopy, Acoustic emission, Thermography, Induced currents, Radiography, Ultrasound and Leak detection.

Textbook Information

- C. Hellier, Handbook of Nondestructive Evaluation, 3^rd Ed. McGraw-Hill Education.

- Notes and slides by the teacher

Course Planning

	Subjects	Text References
1	NDT Introduction	- Handbook of Nondestructive Evaluation - Slides & Notes by the teacher
2	Defects produced during furnace processing and casting	- Handbook of Nondestructive Evaluation - Slides & Notes by the teacher
3	Defects produced during weldings	- Handbook of Nondestructive Evaluation - Slides & Notes by the teacher
4	Defects during mechanical processing	- Handbook of Nondestructive Evaluation - Slides & Notes by the teacher
5	Visual Testing (VT)	- Handbook of Nondestructive Evaluation - Slides & Notes by the teacher
6	Penetrant Testing (PT)	- Handbook of Nondestructive Evaluation - Slides & Notes by the teacher
7	Magnetic Particle Testing (MT)	- Handbook of Nondestructive Evaluation - Slides & Notes by the teacher
8	Acoustic Emission Testing (AT)	- Handbook of Nondestructive Evaluation - Slides & Notes by the teacher
9	Infrared Thermographic Testing (TT)	- Handbook of Nondestructive Evaluation - Slides & Notes by the teacher
10	Eddy Currents Testing (ET)	- Handbook of Nondestructive Evaluation - Slides & Notes by the teacher
11	Radiographic Testing (RT)	- Handbook of Nondestructive Evaluation - Slides & Notes by the teacher
12	Ultrasound Testing (UT)	- Handbook of Nondestructive Evaluation - Slides & Notes by the teacher
13	Leak detection (LT)	- Slides & Notes by the teacher

Learning Assessment

Learning Assessment Procedures

The exam consists of an oral test. During the lessons, application exercises of the course contents are carried out in the laboratory aimed at learning practical experimentation by the students. The laboratory exercises, each described in the form of a technical report, and the topics covered during the lectures are discussed during the oral exam. The evaluation during the oral interview will be based on: knowledge of the topics covered, the relevance of the answers to the questions asked, the ownership of technical language, the ability to make connections between the contents of the program.

To guarantee equal opportunities and in compliance with current laws, interested students can request a personal interview in order to plan any compensatory and/or dispensatory measures, based on the educational objectives and specific needs. You can also contact the CInAP (Centre for Active and Participated Integration - Services for Disabilities and/or DSA) professor of your Department.

Examples of frequently asked questions and / or exercises

Describe the defects found in electrical resistance weldings and the most common NDT methods for revealing them.
How is mutual induction used in eddy current inspection?
What does pulsed thermography mean?
Describe the phenomenon of Attenuation in Acoustic Emission test and the three main causes that determine it. Why it is important to know the level of attenuation during a non-destructive test.
What is the geometric penumbra in radiographic testing? How is it calculated?

Degree Course in

Mechanical Engineering