Dynamic Failure of Integrated Durable Hot Structure for Space Access Vehicles
Final rept. 1 Jan 2006-30 Dec 2008
RHODE ISLAND UNIV KINGSTON DYNAMIC PHOTOMECHANICS LAB
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A fundamental study was conducted to evaluate dynamic fracture and failure in functionally graded materials FGM at room and high temperatures. Asymptotic analysis in conjunction with displacement potentials was used to develop thermo-mechanical stress fields for a mixed mode propagating crack in homogenous and FGMs. First, asymptotic temperature fields were derived for an exponential variation of thermal conductivity and later these temperature fields were used in deriving stress fields. Using asymptotic thermo-mechanical stress fields the variation of maximum shear stress, circumferential stress and strain energy density as a function of temperature around the crack-tip were generated. Finally, utilizing the minimum strain energy density criterion and the maximum circumferential stress criterion, the crack growth direction for various crack-tip speeds, non-homogeneity coefficients and temperature fields were determined.
- Unmanned Spacecraft