ISSN:
1741-2765
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract When a material is rate sensitive during loading, it may also be expected to be rate sensitive during unloading and reverse loading. To investigate this matter, a series of experiments was performed on a moderately ratesensitive magnesium alloy. A modified torsional split-Hopkinson-bar system was used in which a high shear-strain rate can be suddenly imposed on a short specimen while it is being plastically twisted in the opposite sense at a much lower rate. The torsional pulse has a short rise time and a large amplitude, and is of approximately 1 ms useful duration. This allows the specimen to be unloaded and plastically loaded to fracture in the opposite sense within a few microseconds. Forward loading was kept throughout at a shear-strain rate of about 0.006 s−1, while the reverse straining occurred at 0.006, 250 and 1100 s−1. Strain-rate dependence of the reverse loading at various plastic prestrain values ranging from 0.0 to 0.3 is presented and discussed as a macroscopic phenomenon in the context of various ‘Bauschinger-effect’ stress parameters.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02324016
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