About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
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Additive Manufacturing: Advanced Characterization with Synchrotron, Neutron, and In Situ Laboratory-scale Techniques
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Presentation Title |
A-39: Residual Stress Measurement Techniques for Additive Manufacturing Parts |
Author(s) |
Adi Benartzy, Kahraman Demir, Jack Peterson, Grace X Gu, Peter Hosemann |
On-Site Speaker (Planned) |
Adi Benartzy |
Abstract Scope |
There are different sources for residual stresses in additive manufacturing (AM) parts including thermal expansion leading to micro plasticity during heating, thermal contraction during solidification of each laser pass, and volume change due to phase transformations. Currently, residual stress measurement techniques are destructive or semi destructive tests based on releasing the stresses by drilling or slitting the sample while X-ray or neutron techniques are non-destructive but require powerful beams. In this work, a novel Non-Destructive Testing technique to measure residual stresses is established using Femto laser surface trenching up to 100μm depth. Residual stresses are applied to a carbon steel ring using 250W YAG laser and measured by strain-gages during Femto laser trenching. The results are verified by macro slitting of the ring and spreading measurement. Both micro and macro stresses are in good agreement with numerical analysis of the stresses that described the residual stresses using first principles. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |