Anisotropy and Cyclic Loading Mechanical Behavior of Ultra-high Strength Steel for Roll Bending

LIU Yang; CHANG Ying; LI Yanbo; GENG Xiaoyong; WANG Wenbin; GAO Yanan; LI Qingda; LIU Daidai; LIU Yongchang

doi:10.3969/j.issn.1674-6457.2026.03.007

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Journal of Netshape Forming Engineering ›› 2026, Vol. 18 ›› Issue (3) : 64-73. DOI: 10.3969/j.issn.1674-6457.2026.03.007

Iron and Steel Forming

Anisotropy and Cyclic Loading Mechanical Behavior of Ultra-high Strength Steel for Roll Bending

LIU Yang^1,2,3, CHANG Ying^2,*, LI Yanbo^1,3, GENG Xiaoyong^1,3, WANG Wenbin^1,3, GAO Yanan^1,3, LI Qingda^1,3, LIU Daidai^1,3, LIU Yongchang^1,3

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Abstract

Since there is a lack of understanding regarding the mechanical behavior of ultra-high strength steel during roll bending under complex transverse (90° direction) loading conditions, the work aims to systematically investigate the cyclic loading response and anisotropy of 118DP ultra-high strength steel in the rolling direction (0°), 45°, and transverse (90° direction). Test procedures were conducted with a buckling control fixture and an MX100 data acquisition system. The Hollomon hardening model, plastic anisotropy coefficient, and Bauschinger parameter were quantitatively evaluated through uniaxial tension, tension-compression-tension (TCT), and compression-tension-compression (CTC) cyclic tests. The transverse direction (90° direction) exhibited significant anisotropy (34.88%) and a Bauschinger effect. The transverse work hardening rate (n) and plastic strain ratio (r) in this direction were notably lower compared to those in the rolling direction, leading to a reduction in bending capability. Moreover, the Bauschinger effect and tension-compression asymmetry of ultra-high strength steel increased with the increasing prestrain levels. The Bauschinger effect was more pronounced in the CT path than in the TC path, with the most significant effects observed in the 90° direction (CT) and 45° direction (TC). The softening behavior of high-strength steel under the CT path was remarkable, resulting in permanent softening of the material, while the reverse compression branch hardening ability under the TC path was enhanced. This study addresses the theoretical gap regarding the transverse deformation mechanism of ultra-high strength steel. It offers a theoretical foundation for optimizing the roll bending process parameters of ultra-high strength steel, which can enhance the accuracy of forming complex components.

Key words

ultra-high strength steel (UHSS) / cyclic loading / Bauschinger effect / anisotropy / material softening and hardening

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LIU Yang, CHANG Ying, LI Yanbo, GENG Xiaoyong, WANG Wenbin, GAO Yanan, LI Qingda, LIU Daidai, LIU Yongchang. Anisotropy and Cyclic Loading Mechanical Behavior of Ultra-high Strength Steel for Roll Bending[J]. Journal of Netshape Forming Engineering. 2026, 18(3): 64-73 https://doi.org/10.3969/j.issn.1674-6457.2026.03.007

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