Structural Probabilistic Failures, Control and Survivability

STRUCTURAL PROBABILISTIC FAILURES, CONTROL AND SURVIVABILITY

Harry H. Hilton, NCSA and AAE/UIUC
Cristina Beldica, NCSA and AAE/UIUC

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Research Objectives:

To carry out a comprehensive multiphase and multidisciplinary programs in analytical and HP computational research in the areas of:

Probabilistic approaches to structural reliability, health monitoring and survival, material property characterization, loads, boundary and environmental conditions, and dimensions
Multidisciplinary problems in CSM/CFD interactions such as aeroelasticity, aero-viscoelasticity, stability
Analysis of advanced composite structures including random short fibers
Electronic packaging
Probabilistic structural control, survivability and sensing using piezoelectric devices
Stochastic minimum structural weight analysis
Analytical formulation & development of optimum "designer structural materials"
Development of virtual experiments
Development of computational subroutines and toolboxes for ANSYS, ABAQUS, NASTRAN, LS- DYNA, MATLAB, MAPLE, MATHEMATICA, FORTRAN, C++, etc.

Figure 1. Effects of Viscoelastic and Piezoelectric Damping on Vibrations

Methodology:

The approaches are analytical and computational and lead to a number of publications in archival journals and conference proceedings and are of interest to the DoD CFD and structural/solid mechanics community.

Results:

The various studies have produced fundamental understanding and applied results to a large number of problems associated with material and structural control and survivability of flight vehicles. They are described in detail

http://www.ncsa.uiuc.edu/EP/CSM/

http://www.ncsa.uiuc.edu/EP/CSM/publications/

http://www.ncsa.uiuc.edu/EP/CSM/presentations/

Significance:

Provide DoD, ARL, ASC and industry researchers, engineers, scientists and designers with modern analytical and computational models and tools to give them the ability to create realistic materials and structures based on survival probabilities and times to failure. To make software & results universally available through grids (metacomputing).

THE NCSA EP CSM GROUP Research Activities

1997 1998 1999 2000 2001
Archival journals and proceedings papers
Published or accepted 22 26 30 22 12
Submitted, not yet accepted 18
Presentations at national
and international conferences(*) 17 25 23 17 1

(*) not all trips charged to PET

Figure 2. Invariant Failure Surface

Figure 3. Probability of Delamination Onset