program - AIAS Summer School 2020

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DATES AND DEADLINE



COURSE DATES: from June 15 to 18, 2020

REGISTRATION DEADLINE: 10th, June 2020


PROGRAM



TIME
MONDAY
JUN. 15, 2020
TUESDAY
JUN. 16, 2020
WEDNESDAY
JUN. 17, 2020
THURSDAY
JUN. 18, 2020
OPENING
8:45
8:45
8:45
8:45

9:15:11:15
University of Pisa

Prof. Beghini Marco

Residual stress and their detection by means of mechanical methods

9:00-11:00
Politecnico di Milano

Prof. Laura Vergani

Ph.D. activity presentation

9:00-11:00
Politecnico di Bari

Prof. Umberto Galietti

Infrared thermography for Stress Analysis, Non Destructive Testing and Damage monitoring

9:00-11:00
Università di Catania

Prof. Giuseppe Mirone

Static-dynamic hardening of metals: basic background and experimental procedures

11:30-13.30
Politecnico di Milano

Prof. Mario Guagliano

The X-Ray Diffraction for the measurement of residual stresses

11:15-13.15
Università Politecnica delle Marche

Prof. Marco Sasso

Strain Measurement: from basic methods to DIC

11:15-13.15
University of Padova

Prof. Giovanni Meneghetti and Ing. Alberto Campagnolo

Infrared thermography and DC potential drop techniques for fracture mechanics testing

11:15-13.15
Politecnico di Torino

Prof. Davide S. Paolino

Very-High-Cycle Fatigue of metallic materials: experimental methods and analyses



16:00-18:00
University of Illinois, IL-USA/Università della Calabria

Prof. Huseyin Sehitoglu
and Ing. Emanuele Sgambitterra

DIC Measurements


14:30-16:30
Final test
 
Prof. Laura Vergani
LECTURES



Prof. Marco Beghini
Università di Pisa
Monday, June 15, 2020
9:15 – 11:15
Residual stress and their detection by means of mechanical methods

In this lecture, an introduction to the nature and the origin of the residual stress in mechanical components is presented. The main methods developed for detecting and measuring residual stress by means of mechanical methods are discussed and their most significant advantages and limits are discussed. A few application is briefly presented.

- What are residual stresses (RSs)? The concept of initial strain distribution
- The conceptual approach of RSs measurement by means of mechanical methods
- The hole drilling technique: applications, limits and trends
- The slitting technique: applications, limits and trends
- Examples

Prof. Mario Guagliano
Politecnico di Milano
Monday, June 15, 2020
11:30-13:30
The X-Ray Diffraction for the measurement of residual stresses

Residual stresses play an important role in the mechanical strength of materials, especially as regards fatigue. However their experimental measurement has always been challenging and different methods were proposed.
In the present lecture X-Ray diffraction is considered.
After a brief introduction on the nature of metals and of X-rays the diffraction phenomenon is considered. The procedure to determine the residual stresses through the measurement of the diffraction angle by using the Bragg’s law is described, critically discussing the different methods to elaborate the results and the pros and cons of the XRD technique. Finally the practical and applicative issues related to this kind of measurement are highlighted starting from some effective measurement performed on the materials of technical interest.

Prof. Marco Sasso
Università Politecnica delle Marche
Tuesday, June 16, 2020
11:15 – 13:15
Strain Measurement: from basic methods to DIC

This lecture will illustrate the principal methods for strain measurement, highlighting its importance in material and structure characterization. The Digital Image Correlation (DIC) technique will be presented in detail; examples in both small and large displacements framework will be given.
The outline of the presentation is as follows:
- Strain concepts
- Basic continuum mechanics
- Digital imaging
- Correlation methods, details of the so called “Global Approach”
- Applications

Prof. Huseyin Sehitoglu
University of Illinois at Urbana-Champaign
Tuesday, June 16, 2020
16:00 – 17:30

Digital Image Correlation- A Tool to Better Understand Materials

Subtopics:
- Overdeterministic approach;
- Fatigue Crack Growth in Metals (Stress Intensity, fatigue crack closure)
- Slip Transmission/Blockage in Metals (Fatigue Crack Initiation)

Ing. Emanuele Sgambitterra
Università della Calabria
Tuesday, June 16, 2020
17:40 – 18:40
Inverse problems with the Digital Image Correlation: approach and application

This lecture will illustrate the application of the Digital Image Correlation and overdeterministic approach to determine applied thermo-mechanical loads or the properties of a material. Three different case studies will be showed.
The outline of the presentation is as follows:
- Case study 1: fracture mechanic;
- Case study 2: Brazilian test;
- Case study 3: Shape memory alloy couplers.

Prof. Umberto Galietti
Politecnico di Bari
Wednesday, June 17, 2020
9:00 – 11:00
Infrared thermography and DC potential drop techniques for fracture mechanics testing

The elastic-plastic J-integral is known to be an appropriate parameter to correlate fatigue crack growth data of ductile metals. Since an analytical link is known to exist between the J-integral and the strain energy density close to  the crack tip, and the strain energy fluctuations cause temperature variations, hence the possibility to measure the J-integral from infrared thermographic scanning at the crack tip is envisaged and it is the focus of the first lecture. In the second lecture, the problem of the crack size determination is treated by means  of the direct current potential drop (DCPD) technique. In particular, the DCPD technique is presented with emphasis on accuracy, calibration and detection of crack shape as well as location by using multiple probes

Prof. Giovanni Meneghetti – Ing. Alberto Campagnolo
Università di Padova
Wednesday, June 17, 2020
11:15 – 13:15
Infrared thermography and DC potential drop techniques for fracture mechanics testing

The elastic-plastic J-integral is known to be an appropriate parameter to correlate fatigue crack growth data of ductile metals. Since an analytical link is known to exist between the J-integral and the strain energy density close to  the crack tip, and the strain energy fluctuations cause temperature variations, hence the possibility to measure the J-integral from infrared thermographic scanning at the crack tip is envisaged and it is the focus of the first lecture. In the second lecture, the problem of the crack size determination is treated by means  of the direct current potential drop (DCPD) technique. In particular, the DCPD technique is presented with emphasis on accuracy, calibration and detection of crack shape as well as location by using multiple probes

Prof. Giuseppe Mirone
Università di Catania
Thursday, June 18, 2020
9:00 – 11:00  
Static-dynamic hardening of metals: basic background and experimental procedures.

A quick introduction will recall the main aspects of the stress-strain characterization of ductile metals at large plastic strains, encompassing static/dynamic/high temperature conditions.
Then, the experimental procedures related to the subject will be illustrated, highlighting the limitations of the conventional approach, some practical ways for partially overcoming such limitations and the still-open issues requiring further efforts.

Experimental data will be distributed together with quick-reference instructions for the data analysis.
On a voluntary basis, the attendants will be also invited to make their own elaboration of the delivered data within a prescribed time (e.g. 3 weeks), possibly in groups of 2-4 persons each.
The results from different groups will be then collected in a shared internet folder accessible by all participants for a general comparison, in the spirit of a miniature round-robin data analysis.

Keywords of the lecture are:
- Isotropic hardening
- Engineering and True curves after necking
- Temperature and strain rate effects
- Experimental procedures for static and dynamic characterization;
- Analysis of experimental data for flow curves and strain rate histories;


Prof. Davide S. Paolino
Politecnico di Torino
Thursday, June 18, 2020
11:15 – 13:15
Very-High-Cycle Fatigue of metallic materials: experimental methods and analyses

The lecture is devoted to the Very-High-Cycle Fatigue (VHCF) testing of metallic materials. The following topics will be covered in the lecture:
- Experimental methods adopted for investigating the VHCF region;
- Relevant theories proposed in the literature for modelling crack growth in the VHCF region;
- Statistical methods for the analysis of the experimental data in the VHCF region.



Riferimenti


Sede legale: Via Alfonso Rendano 18,  00199 Roma

Sede operativa:  c/o Univesità degli Studi della Calabria, Via Pietro Bucci, 87036 Arcavacata, Rende CS

C. F.: 95104900246

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