Descripció del projecte
Isogeometric analysis (IGA) represents a recently developed technology in computational mechanics that offers the possibility of integrating methods
for analysis and Computer Aided Design (CAD) into a single, unified process. The implications to practical engineering design scenarios are profound,
since the time taken from design to analysis is greatly reduced, leading to dramatic gains in efficiency. Specifically, IDIADA together with UPC are
interested in researching the application possibilities of IGA in the automotive industry for crashworthiness analysis, with specific focus on modelling
ductile fracture using advanced plasticity.
IGA adopts smooth splines, NURBS and generalizations to approximate problem unknowns, in order to simplify the interaction with computer aided
geometric design (CAGD). The same functions are used to parametrize the geometry of interest. Important features emerge from the use of smooth
approximations of the unknown fields. When a careful implementation is adopted, which exploit its full potential, IGA is a powerful and efficient
high-order discretization method for the numerical solution of PDEs.
Specifically, ANSA-META will be used in this work as a pre-post processing solution to ensure that CAD geometry is IGA ready and to generate the
input for the specific problem solver considered, which is LS-DYNA.
ANSA is a multidisciplinary CAE pre-processing system that integrates functionality for full-model build up, from CAD data to ready-to-run solver
input file for numerous analysis codes. Its rich automated functionality provides a uniquely productive modelling environment.
META is a multi-purpose CAE post-processing software that provides a broad range of functionality for analysing and reporting results from
numerous solvers. Its innovative features, with high level of automation and customization, offer solutions with industry leading performance.
LS-DYNA is a general-purpose finite element program capable of simulating complex real world problems. It is used by the automobile, aerospace,
construction, military, manufacturing, and bioengineering industries. LS-DYNA is optimized for shared and distributed memory Unix, Linux, and
Windows based, platforms, and it is fully QA’d by LSTC. The code’s origins lie in highly nonlinear, transient dynamic finite element analysis using
explicit time integration allowing its use for automotive crash applications.
Throughout the project, comparisons will be made with the Finite Element Method (FEM) for the specific applications envisioned in order to
determine the degree of accuracy of the IGA solution as compared to the traditional FEM one, as well as the computational effort required from both
technologies for a determined solution precision.
