Statistics – Applications
Scientific paper
Nov 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993asee.nasa.....k&link_type=abstract
In its The 1993 NASA/ASEE Summer Faculty Fellowship Program 5 p (SEE N94-24405 06-80)
Statistics
Applications
Crack Propagation, Cracks, Finite Element Method, Fracturing, Impact Damage, J Integral, Pressure Vessels, Structural Failure, Estimating, High Pressure, Hypervelocity Projectiles, Meteorite Collisions, Space Stations
Scientific paper
Prediction of whether a pressurized cylinder will fail catastrophically when impacted by a projectile has important applications ranging from perforation of an airplane's skin by a failed turbine blade to meteorite impact of a space station habitation module. This report summarizes the accomplishment of one task for a project whose aim is to simulate numerically the outcome of a high velocity impact of pressure vessels. A finite element patch covering the vicinity of a growing crack has been constructed to estimate the J-integral (crack driving force) during the impact. Explicit expressions for the J-integral through the nodal values of displacement, strain, and stress have been written. The patch is to be used repeatedly to estimate the amount of crack growth during the time of the impact. The resulting crack size is to be compared to an estimated critical crack size for the pressurized cylinder.
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