The influence of constant axial compression pre-stress on the fatigue failure of torsion loaded tube springs

This paper reports the results of a series of biaxial static compression and torsion experiments performed to evaluate the effects of static compression stress on the fatigue life those smooth tubes made of high strength spring steel. Compression pre-stress was introduced by a solid steel bar insert...

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Bibliographic Details
Published in:Engineering fracture mechanics 2010-11, Vol.77 (16), p.3132-3142
Main Authors: Močilnik, Vinko, Gubeljak, Nenad, Predan, Jožef, Flašker, Jože
Format: Article
Language:English
Subjects:
Biaxial fatigue crack propagation
Biaxial loading
Compressing
Compressive strength
Exact sciences and technology
Fatigue failure
Fatigue life
Fracture mechanics
Fracture mechanics (crack, fatigue, damage...)
Fundamental areas of phenomenology (including applications)
Low fatigue loading
Physics
Shear
Solid mechanics
Structural and continuum mechanics
Torsion
Torsion and compression
Tubes
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Summary:This paper reports the results of a series of biaxial static compression and torsion experiments performed to evaluate the effects of static compression stress on the fatigue life those smooth tubes made of high strength spring steel. Compression pre-stress was introduced by a solid steel bar inserted into a hollow spring and loaded with a screw-joint. The experimentally obtained results show a significant extension of fatigue strain life as a result of combining axial compression loading with torsion. Cracking behavior was observed and it was noted that compression pre-stresses contribute to retardation of the fatigue crack initiation process and, consequently, contribute to the extension of fatigue life. The fatigue shear crack initiated in a transverse direction. This crack continues to propagate in the same direction until it starts to propagate as a macro-crack on the maximum shear plane.
ISSN:0013-7944
1873-7315
DOI:10.1016/j.engfracmech.2010.07.014