Determining cyclic flow curves using the in-plane torsion test

Yin, Qing; Tekkaya, A. Erman; Traphöner, Heinrich

doi:10.1016/j.cirp.2015.04.087

Cited by 38 publications

(10 citation statements)

References 12 publications

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“…In addition, grooved inplane torsion tests were carried out in the Institute of Forming Technology and Lightweight Construction at TU Dortmund University. The details of this test were presented by Yin et al [25]. All the tests were performed along with the 3D digital correlation image (DIC) technique using a camera frequency of 5 s to track the local deformation.…”

Section: Methodsmentioning

confidence: 99%

Effects of Microstructural Properties on Damage Evolution and Edge Crack Sensitivity of DP1000 Steels

et al. 2022

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In the present work, the microstructural damage behavior of two DP1000 steel test subjects through various stress states was studied to thoroughly learn the interaction between microstructure, damage evolution, and edge stretchability. In addition, microstructural changes at the fracture sites and fracture surfaces were observed using a scanning electron microscope. The distinctive mechanical and damage behaviors of the materials were revealed. However, the steels were slightly different in chemical composition, microstructural characteristics, and yield stress. The results showed that when microstructural and mechanical properties of phases were more similar, i.e., the microstructure was more homogenous, the damage was initiated by cracking at ferrite-martensite interfaces, and it propagated along the loading direction. This allowed the material to represent high local formability and significant necking. In contrast, by increasing the dissimilarity between ferrite and martensite phases, damage propagated by the shear linking of the voids hindered local deformation of the material and led it to sudden fracture after negligible necking. These distinct damage evolutions noticeably influenced the materials’ edge stretchability. Since higher local formability favors the edges with higher resistance to cracking, the hole expansion ratio increases, as clearly observed throughout the current study.

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Section: Methodsmentioning

confidence: 99%

Effects of Microstructural Properties on Damage Evolution and Edge Crack Sensitivity of DP1000 Steels

et al. 2022

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“…In order to cope with the problem of experimental effort to generate multiple cyclic stress strain curves, Yin et al [25] presented a novel experimental approach for the generation of multiple cyclic stress-strain curves based on the in-plane torsion test and the digital image correlation. With a single test run and a single specimen up to 50 cyclic stress-strain curves could be generated based on the pre-strain using this approach.…”

Section: Introductionmentioning

confidence: 99%

“…Due to the versatility of this test, it was also used for investigation of formability of sheet metals [27] and flow curve identification [28]. Since the identified material parameters are dependent on influences as for example the pre-strain of the experimental curves [25], the use of stress and strain dependent material parameters could be an approach to enhance the quality of simulations.…”

Section: Introductionmentioning

confidence: 99%

Accurate springback prediction in deep drawing using pre-strain based multiple cyclic stress–strain curves in finite element simulation

Hassan

Traphöner

Güner

et al. 2016

International Journal of Mechanical Sciences

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“…As a countermeasure Kuwabara et al [17] introduced a support device, while Boger [18] used on special specimen geometries. Other characterization methods include the cyclic planar shear test [19], the cyclic bending test [20] and the cyclic inplane torsion test [21].…”

Section: Introductionmentioning

confidence: 99%

Consequences of large strain anisotropic work-hardening in cold forging

2021

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The influence of anisotropic work-hardening on the component properties and process forces in cold forging is investigated. The focus is on the material behaviour exhibited after strain path reversals. The work-hardening of three steels is characterized for large monotonic strains (equivalent strains up to 1.7) and subsequent strain path reversals (accumulated strains up to 2.5). Tensile tests on specimens extracted from rods forward extruded at room temperature reveal an almost linear work-hardening for all investigated steels. The application of compressive tests on extruded material gives insights into the non-monotonic work-hardening behaviour. All previously reported anisotropic work-hardening phenomena such as the Bauschinger effect, work-hardening stagnation and permanent softening are present for all investigated steels and intensify with the pre-strain. Experimental results of 16MnCrS5 were utilized to select constitutive models of increasing complexity regarding their capability to capture anisotropic work-hardening. The best fit between experimental and numerical data was obtained by implementation of a modified Yoshida-Uemori model, which is able to capture all observed anisotropic work-hardening phenomena. The constitutive models were applied in simulations of single- and multi-stage cold forming processes, revealing the significant effect of anisotropic hardening on the predicted component properties and process forces, originating in the process-intrinsic strain path reversals as well as in strain path reversals between subsequent forming stages. Selected results were validated experimentally.

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Determining cyclic flow curves using the in-plane torsion test

Cited by 38 publications

References 12 publications

Effects of Microstructural Properties on Damage Evolution and Edge Crack Sensitivity of DP1000 Steels

Effects of Microstructural Properties on Damage Evolution and Edge Crack Sensitivity of DP1000 Steels

Accurate springback prediction in deep drawing using pre-strain based multiple cyclic stress–strain curves in finite element simulation

Consequences of large strain anisotropic work-hardening in cold forging

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