FEM research of internal stresses evolution in the prestressing strand production

Alexey Korhunov, E. Medvedeva, P. Ivekeeva, Dmitrii Konstantiov
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引用次数: 1

Abstract

The article presents the finite-element modeling results of stranding, reduction, straightening and mechanicalthermal treatment (MTT) of prestressing strand (PSC strand). Computer models took into account the distribution of residual stresses formed at the preliminary stage of wire drawing. During the simulation, the effect of MTT on the internal stresses of the wires was studied: residual stresses after the drawing process and additional stresses after the stranding. All studied methods demonstrated a positive effect not only from the point of eliminating internal stresses, but also from the point of view of their favorable redistribution. The reduction of PSC strand in a monolith tool with strain degree 1-3% allows to minimize tensile stresses on the surface of the wires and save compressive stresses in the center of the wires. The straightening by a group of 5 rolls made it possible to reduce the tension of outer wires twice. The MTT application, combining the effects of various physical nature, made it possible to control over a wide range the redistribution of residual stresses in the wires after high strain degrees and the additional stresses created during the stranding, which affect the preservation of the geometric parameters of the PSC strand. The study showed that to eliminate longitudinal residual stresses, the magnitude of the tension in the MTT is the most important parameter. Therefore, with a minimum value of tension, the residual stresses are not redistributed either in the central or in the surface layers, regardless of the temperature of the MTT. However, with tension above 70 kN and a temperature of 380-400°C, the residual stresses in the center and on the surface of the wires are balanced or almost completely eliminated.
预应力钢绞线生产过程内应力演化的有限元研究
本文介绍了预应力钢绞线(PSC钢绞线)的绞合、还原、矫直和机械热处理(MTT)的有限元建模结果。计算机模型考虑了拉丝初期形成的残余应力分布。在模拟过程中,研究了MTT对钢丝内应力的影响:拉丝后的残余应力和绞合后的附加应力。所研究的方法不仅从消除内应力的角度来看,而且从它们的有利再分配的角度来看,都显示出积极的效果。在应变度为1-3%的整体工具中,PSC股的减少可以最大限度地减少金属丝表面的拉应力,并节省金属丝中心的压应力。由一组5辊矫直使得有可能减少张力外钢丝两次。MTT的应用,结合各种物理性质的影响,可以在大范围内控制高应变度后金属丝中残余应力的重新分布,以及在成股过程中产生的额外应力,这些应力影响PSC股几何参数的保存。研究表明,为了消除纵向残余应力,MTT内的张力大小是最重要的参数。因此,当张力值最小时,无论MTT的温度如何,残余应力都不会在中心层或表层重新分布。然而,当张力大于70 kN,温度为380-400℃时,丝芯中心和表面的残余应力被平衡或几乎完全消除。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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