Engineers at Applus IDIADA and Applus DatapointLabs have co-authored a technical paper for presentation at the European LS-DYNA Conference 2021, taking place onsite in Ulm, Germany, as well as online, October 5-7, 2021.

Non-Isochoric Plasticity Assessment for Accurate Crashworthiness CAE Analysis. Application to SAMP-1 and SAMP-Light.

   By Eduardo Martin-Santos¹, Lluis Martorell¹, Pablo Cruz¹, Megan Lobdell², Hubert Lobo²

Abstract:
A deep understanding of advanced material plasticity and fracture is one of the cornerstones of mechanical engineering to overcome present and future challenges in the automotive industry with respect to lightweight multi-material body solutions. The correct material law selection may imply a design lightweight efficiency improvement of between 10% and 20% depending on the material, component geometry, manufacturing technology and performance requirements. The accurate implementation of the plastic behaviour becomes mandatory when material fracture is a central design parameter. In this paper, the authors propose a clear process to experimentally measure and assess how far uniaxially tested materials are from pure isochoric plastic behaviour. This process will be named Non-isochoric Plasticity Assessment (NPA). In order to illustrate the process, NPA will be applied to actual experimental results of representative automotive metals and thermoplastics. Material plastic dilation behaviour is studied. A general description is provided regarding plasticity theory concepts required for the usage of non-isochoric plasticity material laws. An approach for the validation of the experimental input data consistency for both SAMP-1 and SAMP-Light material laws is also proposed. The overall approach is finally applied and validated on an extruded aluminium and a thermoplastic showing a proper level of correlation between CAE and experimental results for shell-based FE-models.

Presented by Pablo Cruz at the 13th European LS-DYNA Conference; October 5-7, 2021; Ulm, Germany.

¹Applus IDIADA, ²Applus DatapointLabs

Applus DatapointLabs is a Silver Sponsor of the European LS-DYNA Conference 2021. If you are participating in the conference, we welcome you to stop by our booth, either onsite or online, or contact us to arrange an appointment.

• Meet us at the 13th European LS-DYNA Conference 2021 (online and onsite), October 5-7, 2021; Ulm, Germany. DatapointLabs is a Silver Sponsor.
• Find us at Design & Engineering 2021 (online), October 12-14, 2021.
• Find us at the CARHS Automotive CAE Grand Challenge (online), October 19-20, 2021; Hanau, Germany.
• Meet us at the Club Utilisateurs Moldflow 2021 | Aplicit, October 21; Paris, France.
• Find us at the NAFEMS World Congress (online), October 25-29, 2021.