Applications of elastic-viscoplastic constitutive models in dynamic analyses of crack run-arrest events
Conference
·
OSTI ID:5633834
Various viscoplastic constitutive models and several nonlinear fracture criteria are being installed in the ADINA general purpose finite element computer program, and the combined predictive capabilities are being evaluated through applications to the HSST wide-plate experiments. The first two constitutive models selected for installation in ADINA were a variation of the Perzyna elastic-viscoplastic model with linear strain hardening and the Bodner-Partom viscoplastic model with strain hardening. Other models being examined include those due to Robinson-Pugh and Hart. The fracture criteria being examined for use with nonlinear analyses include several path-independent integrals that were formulated to remove limitations on the original J-integral of Rice. Some of these integrals represent slight modifications of the J-integral, while others have a different theoretical basis. This paper describes applications of these nonlinear techniques to the first series of six HSST wide-plate crack-arrest tests that have been performed. These experiments include crack initiations at low temperatures and relatively long (20 cm) cleavage propagation phases which are terminated by arrest in high-temperature regions. Crack arrests are then followed by ductile tearing events. Consequently, the crack-front regions in these tests are exposed to wide ranges of strain rates and temperatures.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 5633834
- Report Number(s):
- CONF-8606138-1; ON: TI86011786
- Country of Publication:
- United States
- Language:
- English
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