Study of Shear Hardening Model Considering Non-uniform Hardening Behavior in Shear Zone

doi:10.3901/JME.260046

Abstract

Abstract: The shear test can be used to evaluate the plastic hardening characteristics of metallic materials under cyclic loading and large strain conditions. However, the existence of end and boundary effects in such tests leads to strain non-uniformity in the deformation zone, resulting in hardening discrepancies that limit the applicability of the tests. A double-groove shear test was conducted on Q890 high-strength steel and AA2219-O aluminum alloy to investigate the influence of strain non-uniformity in the shear deformation zone on yield and plastic flow. A shear stress-strain analytical model was established, considering the hardening discrepancies caused by the non-uniform strain distribution. The accuracy of the model was validated through a comparison with small-hole tensile tests and simulation analysis. The results show that the shear strain decreases gradually from the edge to the center of the shear zone at the same moment of deformation, for Q890 high-strength steel and AA2219-O aluminum alloy, the strains at the edge increases by 6.30% and 12.90%, respectively, compared with that at the center point; the inaccuracy of the prediction of the stress results of the double-tension zone will be caused by not taking the non-uniformity of shear strain into consideration, for Q890 high-strength steel and AA2219-O aluminum alloy, the maximum differences of yield trajectory calibrated by different regional strains are 82 MPa and 19 MPa, respectively, with relative differences of 8.80% and 32.80%; at the same stress level, for Q890 high-strength steel and AA2219-O aluminum alloy, the edge strains increased by up to 26% and 47% over center point strains, respectively; and the prediction error for the necking zone wall thickness of the small-hole tensile test is as high as 9%. After considering the non-uniformity of shear strain, the proposed model will significantly improve the wall thickness prediction accuracy in the necking zone of small-hole tensile test, and the wall thickness prediction error in the necking zone is less than 1%.

Key words: Q890 high-strength steel, AA2219-O aluminum alloy, double groove shear specimen, shear test, non-uniform hardening

CLC Number:

TG156

LIN Yanli, XU Enqi, SU Yibo, QIAN Quan, LI Yuetong, HE Zhubin. Study of Shear Hardening Model Considering Non-uniform Hardening Behavior in Shear Zone[J]. Journal of Mechanical Engineering, 2026, 62(2): 181-194.

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