Abstract
This paper comprises a study concerning the mechanical behavior of extra high strength steel. This is investigated by means of biaxial testing of flat cross-shaped specimens in the full σ1-σ2 plane, a concept developed earlier at Steel Structures, Luleå University of Technology. Furthermore, new specimen designs had to be developed to enable testing of a material with high yield strength and low ultimate over yield strength ratio, such as the extra high strength steel Weldox 1100. The tests are performed in two steps: one initial loading followed by unloading and a subsequent loading in a new direction. The test results, containing data from 15 biaxial tests, are characterized by a slightly anisotropic initial yield criterion where the proof stress in compression is consequently somewhat higher compared to the results in tension. In the subsequent loading the observed phenomena are a Bauschinger effect in the direction opposite the initial loading direction and that the transition from elastic to plastic state in subsequent loadings is gradual and direction-dependent.
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Abbreviations
- A gr :
-
gross cross-sectional area
- F :
-
force
- R p0.2 :
-
proof stress
- R m :
-
ultimate strength
- ε:
-
strain
- ɛ pij :
-
plastic strain tensor
- ɛ ij :
-
effective plastic strain
- (ɛ pj )i:
-
plastic strain componentj from rowi in the data file
- (Δɛ pj )i:
-
change of plastic strain componentj from rowi−1 to rowi in the data file
- σ i :
-
stress
- σ ij :
-
stress tensor
- σ e :
-
effective stress
- η:
-
correction function for area
- ϕ:
-
angle in the principal stress plane, where 00 is the rolling direction
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Gozzi, J., Olsson, A. & Lagerqvist, O. Experimental investigation of the behavior of extra high strength steel. Experimental Mechanics 45, 533–540 (2005). https://doi.org/10.1007/BF02427907
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DOI: https://doi.org/10.1007/BF02427907