Tutorials
Monday, June 3
Residual stresses in additive manufacturing
The determination of residual stress in additively manufactured materials is a challenge, even after decades from the establishment of the basics of residual stress analysis. This is due to the peculiar microstructure of such materials. In fact, researchers have discovered that conventional methods for the determination of RS in materials do not properly work for AM materials. In this tutorial, the basics of RS analysis will be explained, together with the basics of AM manufacturing techniques. The microstructure of the peculiar materials (AM) dealt with here will be elucidated. Successively, the necessary modifications to the conventional approaches to RS analysis will be explained and case studies will be displayed, for the attendant to touch with hands the peculiarities of the approaches. Finally, a few experimental and theoretical tips will be given on dos and don’ts for a correct determination of RS in AM materials.
Schedule
|
10:00-11:30 |
Residual Stress: Basic Principles of diffraction measurement methods |
Giovanni Bruno Bundesanstalt für Materialforschung und -prüfung, Berlin, Germany |
|
11:30-12:15 |
Introduction to Additive Manufacturing: Characteristics and Challenges |
Alexander Liehr University of Kassel, Germany |
|
|
Lunch break |
|
|
13:30-14:40 |
Peculiarities of the determination of RS in AM materials |
Jakob Schröder Bundesanstalt für Materialforschung und -prüfung, Berlin, Germany |
|
14:40-15:10 |
Case Studies 1 – RS in Metastable CrMnNi steels processed by PBF-LB/M |
Artjom Bolender University of Kassel, Germany |
|
15:10-15:30 |
Case Studies 2 – RS in DED-arc AM components |
Arne Kromm Bundesanstalt für Materialforschung und -prüfung, Berlin, Germany |
|
|
Break, refreshment |
|
|
16:00-16:20 |
Case Studies 3 – RS analysis in PBF-LB/316L |
Alexander Evans Bundesanstalt für Materialforschung und -prüfung, Berlin, Germany |
| 16:20-17:15 | Best practice: How to work with a mobile diffractometer |
Arne Kromm Bundesanstalt für Materialforschung und -prüfung, Berlin, Germany |
| 17:15-17:45 | Comparison and capabilities of different Methods |
Arne Kromm Bundesanstalt für Materialforschung und -prüfung, Berlin, Germany |
Quantification and uncertainties in residual stress measurement
Measuring the residual stress levels is essential for validating finite element modelling efforts and developing efficient stress mitigation strategies. But a measurement is never better the uncertainty you can assign to it. In this tutorial, we will discuss how residual stress levels are measured using different techniques - and which uncertainties and error bars that should be associated with the most common residual stress measurement techniques used in industry. The presentations will include benchmark studies and round robin proficiency testing and deliver a status of the standardisation efforts in Europe and the US.
Schedule
|
10:00-10:30 |
Standardisation of RS measurement in the EASI-STRESS project |
Nikolaj Zangenberg |
|
10:30-11:15 |
Handling uncertainties in RS modelling |
Juan
Manuel Martinez |
|
11:15-12:30 |
Measurement and uncertainties for (semi)destructive methods |
|
|
11:15-11:45 |
Center hole drilling, ring core drilling and deep-hole drilling |
Ed Kingston |
|
11:45-12:15 |
Contour mapping |
Matthew Roy |
|
|
Lunch break |
|
|
13:30-16:30 |
Measurement and uncertainties for non-destructive methods |
|
|
13:30-14:00 |
Portable and laboratory XRD RS measurement |
Fabien
Lefebvre |
|
14:00-14:30 |
Synchrotron RS measurement |
David
Canelo |
|
14:30-15:00 |
Neutron RS measurement |
Thilo Pirling |
|
15:00-15:30 |
Barkhausen noise measurement |
Per
Lundin |
|
|
Break, refreshment |
|
|
16:00-17:45 |
Measurement and uncertainties for non-destructive methods |
|
|
16:00-16:20 |
The EASI-STRESS benchmark study |
Matthew Roy |
|
16:20-16:45 |
Definition of samples for round robin proficiency testing for synchrotrons and neutron facilities |
Nikolaj G. Henriksen |
|
16:45-17:00 |
Accreditation and proficiency testing for lab-XRD |
Jesus
Ruiz Hervias |
|
17:00-17:30 |
Round table: discussion of round robin (samples and service) |
|
|
17:30-17:45 |
Closing of tutorial |
|