EFFECTS OF SHOCK PRESTRAIN ON THE DYNAMIC MECHANICAL BEHAVIOR OF TANTALUMReport as inadecuate




EFFECTS OF SHOCK PRESTRAIN ON THE DYNAMIC MECHANICAL BEHAVIOR OF TANTALUM - Download this document for free, or read online. Document in PDF available to download.



Abstract : The effects of shock prestrain on the mechanical behavior, microstructure, and substructure of annealed tantalum have been examined. The test material was shocked to 15 GPa for 1 ┬Ás and soft-recovered such that deformation that occurred during this procedure was predominantly due to the shock loading. Mechanical characterization of the annealed and shock-recovered tantalum was performed over a wide range of strain rates 10-3 to 7000 s-l in both tension and compression. Shock prestraining caused an increase in the quasi-static yield strength of tantalum but had virtually no influence on the dynamic stress-strain response. Consistent with this, the dynamic tensile behavior of both the annealed and shock-recovered materials were nearly identical. The effects of shock prestrain on the microstructure and substructure of the test material was examined using optical and transmission electron microscopy. The results of these examinations and how they correlate with the effects of shock prestrain on mechanical behavior are discussed.





Author: D. Lassila G. Gray

Source: https://hal.archives-ouvertes.fr/



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