Experimental investigation of the behavior of extra high strength steel

Gozzi, Jonas; Olsson, Anders; Lagerqvist, Ove

doi:10.1007/bf02427907

Cited by 20 publications

(14 citation statements)

References 11 publications

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“…Compressive principal stresses may be achieved through the use of support plates that prevent the buckling of the specimen gage section (e.g. [3]). However, the key challenges in testing cruciform specimens are related to the stress measurement and the design of the gage section geometry, notably at large strains.…”

Section: Introductionmentioning

confidence: 99%

A New Experimental Technique for the Multi-axial Testing of Advanced High Strength Steel Sheets

Mohr

Oswald

2007

Exp Mech

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This paper deals with the development of a new experimental technique for the multi-axial testing of flat sheets and its application to advanced high strength steels. In close analogy with the traditional tension-torsion test for bulk materials, the sheet material is subject to combined tension and shear loading. Using a custom-made dual actuator hydraulic testing machine, combinations of normal and tangential loading are applied to the boundaries of a flat sheet metal specimen. The specimen shape is optimized to provide uniform stress and strain fields within its gage section. Finite element simulations are carried out to verify the approximate formulas for the shear and normal stress components at the specimen center. The corresponding strain fields are determined from digital image correlation. Two test series are performed on a TRIP-assisted steel sheet. The experimental results demonstrate that this new experimental technique can be used to investigate the large deformation behavior of advanced high strength steel sheets. The evolution of the yield surface of the TRIP700 steel is determined for both radial and non-proportional loading paths.

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Section: Introductionmentioning

confidence: 99%

A New Experimental Technique for the Multi-axial Testing of Advanced High Strength Steel Sheets

Mohr

Oswald

2007

Exp Mech

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“…bulge pressure tests [6,7], hemi-spherical punch (i.e. Nakazima) tests [2,8], cruciform tests [9][10][11], flat punch (i.e. Marciniak) tests [12,13], multiaxial compression tests [14,15], electromagnetic forming tests [16,17] (Fig.…”

Section: Critical Comparison Of Potential Testing Methodologies For Mmentioning

confidence: 99%

Multi-Axial Deformation Setup for Microscopic Testing of Sheet Metal to Fracture

et al. 2011

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While the industrial interest in sheet metal with improved specific-properties led to the design of new alloys with complex microstructures, predicting their safe forming limits and understanding their microstructural deformation mechanisms remain as significant challenges largely due to the inadequacy of the existing experimental tools. The investigation of the strain-path dependent failure mechanisms requires miniaturized testing equipment, which can be placed in a scanning electron microscope for in situ experiments. So far, such tests could only be carried out for a single strain path (uniaxial tension). In this work, in order to fill this gap, a miniaturized Marciniak test setup is designed, built and tested. With this setup real-time, multi-axial tests of industrial sheet metal can be carried out to the point of fracture within a

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“…All the experimental data for biaxial tests, performed on cruciform samples, are taken from the references [17,[19][20][21]. A plastic offset strain of 0.2 % has been considered.…”

Section: Validation Of Theory With Experimentsmentioning

confidence: 99%