ISSN:
1573-9325
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Conclusions 1. It is shown that in low-cycle loading in the whole range of life simultaneous accumulation of quasistatic and fatigue damages occurs. In the area of quasistatic deformation the mechanism of ductile fracture with local occurrence of fatigue fracture is dominant. With an increase in cyclic operating time the cyclic macrodeformations caused by the formation of a fine secondary cellular structure and wide type {1012} twins make an ever-increasing contribution to the accumulated damage. 2. With a change in loading frequency from 0.03 to 0.3 Hz the anisotropy in plastic macrodeformation decreases both in quasistatic and in fatigue fracture, which is related to inclusion of additional slip planes, and with exhausting of the dislocation mechanism of plastic deformation to twinning of the titanium. 3. A physical model is proposed which assumes the possibility of splitting of the secured dislocations and makes it possible to relate the stacking-fault energy to the loading frequency. With a change in frequency from 0.03 to 0.3 Hz there is an increase in the stacking-fault energy and, as the result, in the cyclic life.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01524182
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