| 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 |
Reliability-Based Design and Certification of Hybrid Composites |
| Author(s) |
Philippe Hawi, Zhengtao Yao, Roger Ghanem, Venkat Aitharaju, Jay Mahishi |
| On-Site Speaker (Planned) |
Philippe Hawi |
| Abstract Scope |
Design allowables for composite laminates are associated with a specific level of confidence and are used to establish the maximum allowable material property values for design purposes. In MIL-HDBK-17, the A-basis allowable is associated with a confidence level of 95% for the 1st percentile of the samples. This means that the material property values provided as A-basis allowables are expected to be met or exceeded with probability of 99% (i.e. probability of failure less than 1%) by at least 95% of the material population.
Certifying every material property of a laminate design at a 1% probability of failure can lead to: 1) An over-conservative design, especially when the failure mode requires simultaneous deficiencies in multiple independent material properties, a scenario in which the probability of failure of the composite part decreases exponentially with the number of material properties; 2) An inconsistent threshold for the probability of failure of the composite part since different geometric irregularities and loading conditions will lead to different relationships between the material properties and the design performance metric.
We present an alternative perspective on the design and certification of composite laminates that is instead based on the probability of failure of the composite part. We propose a framework that relies on high-fidelity simulations coupled with advanced surrogate modeling methods to build a joint probability density function (PDF) of the mesoscale material properties and the final performance metric. We show how this joint PDF can be leveraged to ensure a consistent design paradigm across geometries and applications. |
| Proceedings Inclusion? |
Definite: Post-meeting proceedings |