| 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 |
Toward Realistic Simulation of Transient Events within an Efficient Workflow Using Implicit and Explicit Solvers: Application to Laminated Composite Materials |
| Author(s) |
Jeremy Germain |
| On-Site Speaker (Planned) |
Jeremy Germain |
| Abstract Scope |
Numerical simulation is a promising method to evaluate risk associated to an accidental loading on a structure in service, but simulations remain numerically expensive due to the nature of the loadings to be accounted for.
Accidental events are usually transient dynamic loadings modelled with explicit finite element code. This loading must be added up to the current structure loads to accurately predict damage and strength. Indeed, structures are generally stressed when an accidental event occurs, initial loads are usually quasi-static and efficiently solved using an implicit finite element code.
An existing strategy in explicit commercial finite element code to introduce an initial loading relies on viscous relaxation, but the associated cost may become tremendous: preserving the time step stability condition in explicit simulations causes an important number of increment to progressively dissipate the kinetic energy.
This work proposes a non-intrusive methodology relying on an alternate use of implicit and explicit solver to take into account initial in-service loads in the dynamic simulation. Efficiency will be demonstrated with a residual thermal stress simulation of composite materials, induced by the manufacturing process and influencing damage initiation. To our best knowledge, this pre-stress has never been accounted for in transient simulations, such as impact, despite a wide literature about this topic. Then, we will extend the methodology to compression after impact and a loaded stiffened panel, representative of aeronautical structures. To conclude, limits of the approach will be discussed. |
| Proceedings Inclusion? |
Definite: Post-meeting proceedings |