MOČILNIK, Vinko ;GUBELJAK, Nenad ;PREDAN, Jožef . Effect of Presetting and Deep Rolling on Creep of Torsion Spring Bars. Strojniški vestnik - Journal of Mechanical Engineering, [S.l.], v. 71, n.9-10, p. 301-308, july 2025. ISSN 0039-2480. Available at: <https://www.sv-jme.eu/sl/article/effect-of-presetting-and-deep-rolling-on-creep-of-torsion-bars/>. Date accessed: 12 nov. 2025. doi:http://dx.doi.org/10.5545/sv-jme.2025.1407.
Močilnik, V., Gubeljak, N., & Predan, J. (2025). Effect of Presetting and Deep Rolling on Creep of Torsion Spring Bars. Strojniški vestnik - Journal of Mechanical Engineering, 71(9-10), 301-308. doi:http://dx.doi.org/10.5545/sv-jme.2025.1407
@article{sv-jmesv-jme.2025.1407,
author = {Vinko Močilnik and Nenad Gubeljak and Jožef Predan},
title = {Effect of Presetting and Deep Rolling on Creep of Torsion Spring Bars},
journal = {Strojniški vestnik - Journal of Mechanical Engineering},
volume = {71},
number = {9-10},
year = {2025},
keywords = {creep; torsion bar; FEM analyzis; presetting; deep rolling; torque; twist angle; },
abstract = {This study investigates the creep behavior of torsion spring bars by combining experimental testing and numerical modeling. Experimental investigations were performed on torsional specimens subjected to different presetting levels and deep rolling surface treatments, showing different effects on stress relaxation at a constant torsion angle. Finite element method (FEM) simulations incorporating elasto-visco-plastic material behavior successfully reproduced the time-dependent deformation observed experimentally. Material parameters for the FEM model were derived from experimental data. The findings show that a two-stage presetting process combined with intermediate deep rolling results in higher residual compressive stresses in the surface layers compared to a single-stage presetting process. Although this method aims to mitigate creep under constant loading conditions, its effectiveness is limited. A reduction in creep strains is only observed up to a presetting level of approximately 4.3 %; above this threshold, creep strains increase significantly and loading capacity decreases.},
issn = {0039-2480}, pages = {301-308}, doi = {10.5545/sv-jme.2025.1407},
url = {https://www.sv-jme.eu/sl/article/effect-of-presetting-and-deep-rolling-on-creep-of-torsion-bars/}
}
Močilnik, V.,Gubeljak, N.,Predan, J. 2025 July 71. Effect of Presetting and Deep Rolling on Creep of Torsion Spring Bars. Strojniški vestnik - Journal of Mechanical Engineering. [Online] 71:9-10
%A Močilnik, Vinko %A Gubeljak, Nenad %A Predan, Jožef %D 2025 %T Effect of Presetting and Deep Rolling on Creep of Torsion Spring Bars %B 2025 %9 creep; torsion bar; FEM analyzis; presetting; deep rolling; torque; twist angle; %! Effect of Presetting and Deep Rolling on Creep of Torsion Spring Bars %K creep; torsion bar; FEM analyzis; presetting; deep rolling; torque; twist angle; %X This study investigates the creep behavior of torsion spring bars by combining experimental testing and numerical modeling. Experimental investigations were performed on torsional specimens subjected to different presetting levels and deep rolling surface treatments, showing different effects on stress relaxation at a constant torsion angle. Finite element method (FEM) simulations incorporating elasto-visco-plastic material behavior successfully reproduced the time-dependent deformation observed experimentally. Material parameters for the FEM model were derived from experimental data. The findings show that a two-stage presetting process combined with intermediate deep rolling results in higher residual compressive stresses in the surface layers compared to a single-stage presetting process. Although this method aims to mitigate creep under constant loading conditions, its effectiveness is limited. A reduction in creep strains is only observed up to a presetting level of approximately 4.3 %; above this threshold, creep strains increase significantly and loading capacity decreases. %U https://www.sv-jme.eu/sl/article/effect-of-presetting-and-deep-rolling-on-creep-of-torsion-bars/ %0 Journal Article %R 10.5545/sv-jme.2025.1407 %& 301 %P 8 %J Strojniški vestnik - Journal of Mechanical Engineering %V 71 %N 9-10 %@ 0039-2480 %8 2025-07-09 %7 2025-07-09
Močilnik, Vinko, Nenad Gubeljak, & Jožef Predan. "Effect of Presetting and Deep Rolling on Creep of Torsion Spring Bars." Strojniški vestnik - Journal of Mechanical Engineering [Online], 71.9-10 (2025): 301-308. Web. 12 Nov. 2025
TY - JOUR AU - Močilnik, Vinko AU - Gubeljak, Nenad AU - Predan, Jožef PY - 2025 TI - Effect of Presetting and Deep Rolling on Creep of Torsion Spring Bars JF - Strojniški vestnik - Journal of Mechanical Engineering DO - 10.5545/sv-jme.2025.1407 KW - creep; torsion bar; FEM analyzis; presetting; deep rolling; torque; twist angle; N2 - This study investigates the creep behavior of torsion spring bars by combining experimental testing and numerical modeling. Experimental investigations were performed on torsional specimens subjected to different presetting levels and deep rolling surface treatments, showing different effects on stress relaxation at a constant torsion angle. Finite element method (FEM) simulations incorporating elasto-visco-plastic material behavior successfully reproduced the time-dependent deformation observed experimentally. Material parameters for the FEM model were derived from experimental data. The findings show that a two-stage presetting process combined with intermediate deep rolling results in higher residual compressive stresses in the surface layers compared to a single-stage presetting process. Although this method aims to mitigate creep under constant loading conditions, its effectiveness is limited. A reduction in creep strains is only observed up to a presetting level of approximately 4.3 %; above this threshold, creep strains increase significantly and loading capacity decreases. UR - https://www.sv-jme.eu/sl/article/effect-of-presetting-and-deep-rolling-on-creep-of-torsion-bars/
@article{{sv-jme}{sv-jme.2025.1407},
author = {Močilnik, V., Gubeljak, N., Predan, J.},
title = {Effect of Presetting and Deep Rolling on Creep of Torsion Spring Bars},
journal = {Strojniški vestnik - Journal of Mechanical Engineering},
volume = {71},
number = {9-10},
year = {2025},
doi = {10.5545/sv-jme.2025.1407},
url = {https://www.sv-jme.eu/sl/article/effect-of-presetting-and-deep-rolling-on-creep-of-torsion-bars/}
}
TY - JOUR AU - Močilnik, Vinko AU - Gubeljak, Nenad AU - Predan, Jožef PY - 2025/07/09 TI - Effect of Presetting and Deep Rolling on Creep of Torsion Spring Bars JF - Strojniški vestnik - Journal of Mechanical Engineering; Vol 71, No 9-10 (2025): Strojniški vestnik - Journal of Mechanical Engineering DO - 10.5545/sv-jme.2025.1407 KW - creep, torsion bar, FEM analyzis, presetting, deep rolling, torque, twist angle, N2 - This study investigates the creep behavior of torsion spring bars by combining experimental testing and numerical modeling. Experimental investigations were performed on torsional specimens subjected to different presetting levels and deep rolling surface treatments, showing different effects on stress relaxation at a constant torsion angle. Finite element method (FEM) simulations incorporating elasto-visco-plastic material behavior successfully reproduced the time-dependent deformation observed experimentally. Material parameters for the FEM model were derived from experimental data. The findings show that a two-stage presetting process combined with intermediate deep rolling results in higher residual compressive stresses in the surface layers compared to a single-stage presetting process. Although this method aims to mitigate creep under constant loading conditions, its effectiveness is limited. A reduction in creep strains is only observed up to a presetting level of approximately 4.3 %; above this threshold, creep strains increase significantly and loading capacity decreases. UR - https://www.sv-jme.eu/sl/article/effect-of-presetting-and-deep-rolling-on-creep-of-torsion-bars/
Močilnik, Vinko, Gubeljak, Nenad, AND Predan, Jožef. "Effect of Presetting and Deep Rolling on Creep of Torsion Spring Bars" Strojniški vestnik - Journal of Mechanical Engineering [Online], Volume 71 Number 9-10 (09 July 2025)
Strojniški vestnik - Journal of Mechanical Engineering 71(2025)9-10, 301-308
© The Authors 2025. CC BY 4.0 Int.
This study investigates the creep behavior of torsion spring bars by combining experimental testing and numerical modeling. Experimental investigations were performed on torsional specimens subjected to different presetting levels and deep rolling surface treatments, showing different effects on stress relaxation at a constant torsion angle. Finite element method (FEM) simulations incorporating elasto-visco-plastic material behavior successfully reproduced the time-dependent deformation observed experimentally. Material parameters for the FEM model were derived from experimental data. The findings show that a two-stage presetting process combined with intermediate deep rolling results in higher residual compressive stresses in the surface layers compared to a single-stage presetting process. Although this method aims to mitigate creep under constant loading conditions, its effectiveness is limited. A reduction in creep strains is only observed up to a presetting level of approximately 4.3 %; above this threshold, creep strains increase significantly and loading capacity decreases.