| About this Abstract |
| Meeting |
2024 ASC Technical Conference, US-Japan Joint Symposium, D30 Meeting
|
| Symposium
|
2024 ASC Technical Conference, US-Japan Joint Symposium, D30 Meeting
|
| Presentation Title |
Quantitative Comparison of Local Strain Data in Micromechanics Models and Experiments of Composite Micropillars |
| Author(s) |
Tyler Felgenhauer, Ivan Gallegos, Brandon Hearley, Evan J. Pineda, Mark Flores, Satchi Venkataraman |
| On-Site Speaker (Planned) |
Tyler Felgenhauer |
| Abstract Scope |
Local strain fields are at the forefront in micromechanical studies of composite materials as it is known that they drive the failure mechanisms at the microscale, dictating the non-linear behavior at the macroscale. The availability of full field strain data at the microscale is very limited, making it a challenge to validate micromechanics models. However, the Air Force Research Laboratory has conducted in-situ transverse compression experiments on micropillars of polymer matrix composites. The local full strain fields were measured from the experiments utilizing digital image correlation. With the availability of this microscale data, there is a need to quantitatively compare full field data from experiments to that of simulation models. The conventional methods for comparing full field data are qualitatively focused. In this work we explore and compare methodologies for quantitatively verifying and validating local fields predicted by various micromechanics models. The first verification and validation (V&V) technique involves comparing histograms of the local strain data where the frequency is taken as relative volume of the domain that is within the strain range of the corresponding bin. This method only allows the comparing of general trends without some transformation of the data. The alternate methodology is a more recently developed method (Christian et al, 2021) that utilizes QR decomposition and orthogonal basis transformation to directly compare the feature vectors representative of the local fields using the Theon software. The effects of the discretization density and boundary conditions on the metrics used for comparison of full field strain data are presented. |
| Proceedings Inclusion? |
Definite: Post-meeting proceedings |