Residual stress
LEEUWARDEN - Residual stress leads to stress
Does Mr Verhage also suffer from stress? Unlike materials, in which it is always present, his stress is negligible.
If you Google on residual stress, you will find surprisingly little information about it. Reason enough for KIVI Noord to make it the topic of discussion in the third lecture in the series of Knowledge Exchange Meetings at NHL University of Applied Sciences.
What are residual stresses and how do they arise? In a clear lecture for a select group, these questions are explored in depth. Residual stresses are always present in a material as a result of fabrication processes and/or heat treatments. What types are there and what are the consequences? 2 types of residual stresses are distinguished internally in materials and their surfaces, namely tensile stresses and compressive stresses. These stresses lead to:
- Shape changes over time
- Crack initiation in the surface
- Deviating stresses from the calculated
- Preferential anode in case of corrosion
- Roughness enhancement of the surface
Ultimately, residual stresses in the surface cause changing properties of the material and can result in nuisance cracking, fatigue and corrosion, among other things.
In short, residual stresses cannot be prevented, they are always present. However, there are methods to reduce residual stresses.
More information on residual stresses? Contact Mr J. Verhage on +31 6 283 03 815 or at j.f.j.verhage@nhl.nl.
Attend a knowledge-sharing event or give a lecture yourself? Contact Mariska van Cronenberg | m.vancronenberg@online.nl | +31 6 512 02 681
Text: Ir. Mariska van Cronenberg
Description
Region North organises knowledge exchange meetings at NHL University of Applied Sciences. These meetings are exclusively for KIVI members, students and teachers from the Institute of Engineering at NHL Hogeschool. All attendees get time and opportunity to make new contacts and expand the network. In addition, the exchange of knowledge plays an important role.
Is there always residual stress? That is what Mr Jaap F.J. Verhage, lecturer in materials science at NHL University of Applied Sciences, will answer during this meeting.
In all materials there are (mechanical) stresses. Strange as this may seem, these stresses are always present. They determine to what extent a material is resistant to corrosion or when plastic deformation occurs. Moreover, they give rise to undesirable geometric changes of the workpiece, product, tool or machine. Fortunately, residual stresses can be measured. How to apply this knowledge and use it to reduce residual stresses is the focus of this meeting.
Host is the NHL University of Applied Sciences Department of Engineering
Naturally, there will be room for discussion and questions afterwards. Soup and bread will also be provided.
Location
NHL University of Applied Sciences, room B1.029
Rengerslaan 10, 8917 DD Leeuwarden
Organiser
Region North
Name and contact details for information
Mariska van Cronenberg | +31 6 51202681