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Sökning: WFRF:(Gozzi A)

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  • Gozzi, Jonas, et al. (författare)
  • Experimental investigation of the behavior of extra high strength steel
  • 2005
  • Ingår i: Experimental mechanics. - 0014-4851 .- 1741-2765. ; 45:6, s. 533-540
  • Tidskriftsartikel (refereegranskat)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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