Scientific Visualization and Parallel Computing Environment for Simulating Dynamic Failure of Functionally Graded Materials
Award year: 2002-2003
Rapidly advancing developments in the manufacture of ceramic/metal functionally graded materials (FGMs) have created exciting new possibilities for their application in large-scale structural systems requiring ultra-high performance. Current examples include advanced thermal protections for new air/spacecrafts (e.g. space shuttle) and blast resistant systems of critical structural components. The proposed project focuses on developing an integrated multiscale computational environment for simulating spontaneous crack nucleation, initiation, and propagation by means of visualization (Vis), virtual reality (VR) and parallel processing techniques. The fracture events will be represented by a novel interface element for FGMs with tractions across the interface that follow a nonlinear cohesive model driven by work conjugate displacement jumps. This cohesive element may be inserted adaptively in the analysis. The visualization and virtual rendering techniques will allow a better understanding of the mechanics and physics of fracture of FGMs as it makes possible to quantitatively examine large amounts of data into graphical display measurements of physical variables in space and time. Through visualization/animation, the conventional representation of stress tensors, strain tensors, and constitutive relations can be transformed from a series of mathematical equations and matrix quantities to multidimensional visual objects in a dynamic interactive display environment using, for example, tensor glyphs, hyperstreamlines, and sound (to indicate various crack initiation events over time). The goals of this work are divided into two mainstreams:
- MPI-based parallelization of the explicit I-CD (Illinois - Cohesive Dynamic) code for simulating progressive damage in FGMs.
- Development of visualization and VR software for rendering spontaneous crack formation and propagation including representation of evolution of tensorial fields and constitutive relations.
We will work in collaboration with the NCSA scientists Dave Semeraro and William Sherman. The model described above will be implemented using the NCSA CAVE (Cave Automated Virtual Environment) and Immersadesk environments, which will provide greater immersion into the large amount of scientific data, thereby enhancing our understanding of the physics of progressive failure evolution in advanced composites such as FGMs. In addition, we intend to announce/present this work at the Seventh US National Congress of Computational Mechanics (USNCCM VII – Albuquerque, NM, July 27 - 31, 2003), which is one of the most important events in the field of computational mechanics.