Nondeterministic Parameter Space Characterization of the Damage Tolerance of a Composite/Metal Structure

Abstract

An integrated experimental, computational, and non-deterministic approach is demonstrated to predict the damage tolerance of an aluminum plate reinforced with a cocured bonded quasi-isotropic E-glass/epoxy composite overlay and to determine the most sensitive material parameters and their ranges of influence on the damage tolerance of the hybrid system. To simulate the complex progressive damage in the repaired structure, a high fidelity three-dimensional finite element model is developed and validated using four-point bend testing to investigate potential damage mechanisms. A surrogate model is then generated to explore the complex parameter space of this model. Global sensitivity analysis and uncertainty quantification are performed for non-deterministic analysis to characterize the energy absorption capability of the patched structure relative to these influential design properties. Additionally, correlating the data quality of the material parameters with the sensitivity analysis results provides practical guidelines for model improvement and the design optimization of the patched structure.

Evaluation of global sensitivity analysis methods for computational structural mechanics problems

“…These discrepancies were considered to be insignificant as both X4 and X31 had nearly identical measures and X28 and X33 had relatively small measures compared to the top four. As previously stated, a prior UQ study by Arndt et al (2022) concluded that only the top four parameters significantly influenced the prediction of damage tolerance. Additionally, the predicted parameters align with the Arndt et al findings that aluminum and composite shear plasticity are the dominant failure mechanisms.…”

“…The goal of GSA was to determine the most influential parameters on damage tolerance to inform focused experimental testing to fully characterize all dominant parameters. Further details of the model development and validation are available in Arndt et al (2022). Initial simulation indicated that plasticity in the metal significantly dominated damage tolerance, followed by shear in the composite.…”

Sustainable Approach on the Metal Coin Cancelling Methods, Using 3D Modeling and FEM Analysis

“…The studied model will contain as parts, the both coin face cancelling dies and also the coin. Since the cancelling dies have a simple pattern to be computed, the subjected coins present some multiple complex details which cannot be faithfully reproduced on the virtual model [21,22]. So, a coin simplified model will be elaborated for the 100 lei piece, having represented on both faces just the main contour from the properly model.…”