Journal ArticleDOI
The Effect of Biaxial Stresses on Fatigue and Fracture
John J. Kibler,Richard Roberts +1 more
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TLDR
In this article, an analytical and experimental program was conducted to determine if a biaxial stress field produces a significant effect on the fatigue and fracture behavior of thin plates, and it was shown that the effect of nonsingular stresses on the behavior of a crack is examined from both a linear elastic and an elastic-plastic viewpoint.Abstract:
The results are presented of an analytical and experimental program which was conducted to determine if a biaxial stress field produces a significant effect on the fatigue and fracture behavior of thin plates. The materials tested were 6061-T4 and 6061-T6 aluminum sheets and plexiglas sheets. The experimental program included fracture tests with various magnitudes of biaxial load at fracture and fatigue tests with sinusoidal loading normal to the crack and either constant or sinusoidal stresses applied parallel to the crack. The effect of nonsingular stresses on the behavior of a crack is examined from both a linear elastic and an elastic-plastic viewpoint. The experimental study indicates that a biaxial stress field does affect the behavior of a crack in a thin sheet. An increase in the apparent fracture toughness with increasing biaxial load was observed experimentally but as yet cannot be adequately explained using linear fracture mechanics theory. Biaxial stresses were found to produce a shift in the fatigue crack growth rate data, and it is shown that this shift can be predicted using several empirical fatigue crack propagation models.read more
Citations
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Book ChapterDOI
Mechanics of crack curving and branching — a dynamic fracture analysis
TL;DR: In this article, a comparative study on crack curving and branching criteria in dynamic fracture mechanics is conducted. And the authors show that the criteria based on the advanced cracking concept correlated best with available experimental data.
Journal ArticleDOI
Crack border stress and displacement equations revisited
TL;DR: In this article, it is shown that the second term of the series representation for the stresses, a contribution which is independent of distance from the crack tip, can lead to error of serious qualitative nature in the prediction of stress and displacement related quantities of interest.
Journal ArticleDOI
Brittle fracture: Variation of fracture toughness with constraint and crack curving under mode I conditions
Yuh J. Chao,S. Liu,B. J. Broviak +2 more
TL;DR: In this article, the effect of constraint on brittle fracture of solids under predominantly elastic deformation and mode I loading conditions is studied using different cracked specimen geometry, the variation of constraint is achieved in this work.
Journal ArticleDOI
Biaxial load effects in fracture mechanics
TL;DR: In this article, the authors investigated the effect of load biaxiality on the crack-tip region and showed that the impact of load applied parallel to the plane of the crack appears entirely in the second terms of the series representations for local stress and displacement.
Journal ArticleDOI
Biaxial load effects on the crack border elastic strain energy and strain energy rate
TL;DR: The validity of the singular solution for the crack tip stress and displacement field in an infinite sheet with a flat line crack with biaxial loads applied to the outer boundaries was investigated in this paper.
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