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The Effect of Machining the Gage Section on Biaxial Tension/Shear Plasticity Experiments of DP780 Sheet Steel

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Abstract

An experimental approach for determining the effect of machining the gage section of specimens for quasi-static, biaxial tension/shear testing of sheet steels is described. This method is demonstrated by comparing the results found by an existing testing method with a reduced thickness (Mohr and Oswald Exp Mech 48:65–77, 2008) to that of full-thickness specimens. Finally, the same results are compared to a specimen in which half of the thickness is removed. These tests are performed on DP780, a first generation advanced high-strength steel. Analysis of the full-thickness and one of the reduced thickness specimens shows that some second-order effects in measuring stress occur from these procedures, but these effects are small. Direct comparison of the engineering stress versus strain curves for the tested conditions shows that for the steel under consideration, there is little dependence on full-thickness, partial thickness, or through-thickness sampling location for continuum-level anisotropic plasticity properties in multi-axial loading for the material investigated and the methods used in manufacturing the specimens.

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Acknowledgments

The support of the Joint MIT/Industry AHSS Fracture Consortium is gratefully acknowledged. US Steel is thanked for providing the material. Professors Wierzbicki and Mohr are thanked for their editorial review. Professor Dirk Mohr is also thanked for valuable discussions and for some automation of the calibration process.

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  1. Structural Dynamics, TNO, Van Mourik Broekmanweg 6, 2628 XE, Delft, The Netherlands

    C. L. Walters

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  1. C. L. Walters
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Correspondence to C. L. Walters.

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Work performed at Impact and Crashworthiness Laboratory, Department of Mechanical Engineering.

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Walters, C.L. The Effect of Machining the Gage Section on Biaxial Tension/Shear Plasticity Experiments of DP780 Sheet Steel. Exp Mech 53, 1647–1659 (2013). https://doi.org/10.1007/s11340-013-9754-1

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  • DOI: https://doi.org/10.1007/s11340-013-9754-1

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