ISSN:
0894-9166
Keywords:
torsional prestrain
;
plastic damage
;
tensile failure
;
ductile-brittle transition
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
Abstract In this paper, the damage state of a torsional prestrained steel is examined by means of the concepts of continuum damage mechanics and then the tensile properties and fracture ductility of two kinds of steels under various torsional prestrained conditions are investigated from both macroscopic and microscopic points of view. The results show that: (1) the plastic damage caused by torsional prestrain is very slight as contrasted with tensile damage; (2) after torsional prestraining, both yielding strength and ultimate tensile strength become higher for 20 steel and lower for 40Cr steel; (3) when the torsional prestrain exceeds a critical value, that is about 70% of pure torsional shear fracture strain, the ductile-brittle transition of tensile fracture behavior may initiates. Moreover, the advantages and applicable conditions of torsional prestrain strengthening technique are also discussed.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02208367
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