By Eduardo Martin-Santos1, Lluis Martorell1, Pablo Cruz1, Megan Lobdell2, Hubert Lobo2
Presented by Pablo Cruz at the 13th European LS-DYNA Conference; October 5-7, 2021; Ulm, Germany.
1Applus IDIADA
2Applus DatapointLabs
October 05, 2021 | by Pablo Cruz | views 2575
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.
By Eduardo Martin-Santos1, Lluis Martorell1, Pablo Cruz1, Megan Lobdell2, Hubert Lobo2
Presented by Pablo Cruz at the 13th European LS-DYNA Conference; October 5-7, 2021; Ulm, Germany.
1Applus IDIADA
2Applus DatapointLabs
Plastics Metals Automotive Structural Analysis LS-DYNA
Determination and Use of Material Properties for Finite Element Analysis: Book Review
Datapoint Newsletter: Spring '20, Vol. 26.1
A Novel Technique to Measure Tensile Properties of Plastics at High Strain Rates
A Robust Methodology to Calibrate Crash Material Models for Polymers
High Speed Stress Strain Material Properties as Inputs for the Simulation of Impact Situations