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Experimental Investigation of the Influence of Load Direction Changes on Damage in Dual Phase Steel and Aluminum Alloy

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Abstract:

The influence of the stress state on damage evolution, fracture behavior, and component performance is well established for proportional loading conditions. In contrast, many industrial sheet-forming processes involve non-proportional loading paths, which can significantly alter material hardening and fracture responses. Recent results have shown, that load direction changes affect damage evolution in the dual-phase steel DP800. This paper aims to investigate to what extend these results can be transferred to the aluminum alloy AA6082-T6. Therefore, specimens are first prestrained in uniaxial tension and subsequently reloaded either in the same direction or orthogonally, using additional tensile tests. Fracture strains during the subsequent tensile tests are determined by Aramis DIC. Orthogonal load direction changes lead to an increased fracture strain for DP800, but decreased fracture strain for AA6082. While the observed behavior of DP800 can be attributed to the void morphology, which is established during prestraining, the results of AA6082 indicate different damage mechanisms which cause this behavior.

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Periodical:

Solid State Phenomena (Volume 388)

Pages:

121-126

DOI:

https://doi.org/10.4028/p-ov7IKy

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Cite this paper

Online since:

April 2026

Authors:

Philipp Lennemann*, A. Erman Tekkaya, Yannis P. Korkolis

Keywords:

Anisotropy, Damage, Fracture, Sheet

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Creative Commons CC BY 4.0

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References

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