About this Abstract |
Meeting |
2021 AWS Professional Program
|
Symposium
|
2021 AWS Professional Program
|
Presentation Title |
Integrated Computational Materials Engineering (ICME) Techniques to Enable a Material-Informed Digital Twin Prototype for Marine Structures |
Author(s) |
Charles R. Fisher, Kelly Nygren, Armand Beaudoin, Thomas Gnaupel-Herold |
On-Site Speaker (Planned) |
Charles R. Fisher |
Abstract Scope |
Keywords: X-Ray; Neutron Diffraction; Welding; Simulation
Introduction: Residual stress from fabrication can severely degrade structural performance over a ship’s lifecycle. However, evolution of the residual stress distribution throughout the shipbuilding process is not well understood nor is it included in simulations of structural performance. Integrated Computational Materials Engineering (ICME) techniques yield a path to solving this problem through linking digital information across multiple length scales, thereby facilitating simulation of the entire material lifecycle from material fabrication to structural performance. This project pairs computational simulation with physical measurement for verification and validation (V&V) of linked finite-element analysis (FEA) tools.
Experimental Procedure: As part of this study, stress evolution was investigated through fabrication of “sister sample” specimens from a single plate of 1-in. thick HSLA-100 steel. The residual stress distribution and evolution of the physical structures was measured through each step of the fabrication process: incoming plate (rolled and heat treated), water-jet cutting, and welded assembly. Measurements were conducted using both high energy X-rays and neutron diffraction techniques. Concurrently, the linked FEA software tools simulated distortion and residual stress evolution within analogous structures across each fabrication step. The efforts followed specific areas within the component to understand the effects of fabrication on residual stress magnitude and distribution.
Results and Discussion: Initial FEA analysis of the final weldment showed high tensile stresses near the weld passes in the heat-affected zone (HAZ), as expected. Validation of the predicted residual within the three specimens was completed using EDD measurements at the Cornell High Energy Synchrotron Source (CHESS) and using neutron diffraction at the National Institute of Standards and Technology (NIST) Center for Neutron Research. Both through-thickness and two-dimensional maps were used to evaluate the stress state across the three specimens. The results showed high correlation between the measured data and the FEA predictions, particularly for the high strain (>0.0015) fields of first principle strain vectors measured parallel to each welding pass.
Conclusion: The computational validation is the first step towards validating the materials-informed digital twin method for increasing accuracy of structural analysis and fatigue lifecycle evaluation. Future work will compare the computational predictions (with and without material processing data) with mechanical performance under fatigue. |
Proceedings Inclusion? |
Definite: Other |