Transactions of Materials and Heat Treatment

Title：Low cycle fatigue calculation on extrusion cylinder under thermo-mechanical load

Authors： Su Fang1 2 Wang Xiaoguo1 2 Ren Yinyin1 2 Zhou Gaili1 2

Unit： 1.Technology Center Taiyuan Heavy Industry Co. Ltd. 2. Technology Center TZ (Tianjin) Binhai Heavy Machinery Co. Ltd.

KeyWords： extrusion cylinder thermo-mechanical load low cycle fatigue interference assembly local stress-strain method

ClassificationCode：TG375

year,vol(issue):pagenumber：2025,50(7):192-197

Abstract：

In order to study the fatigue failure of extrusion cylinder structure, according to its cyclic stress state and the characteristics of local plastic deformation during failure, it was considered that the fatigue failure of extrusion cylinder belonged to the low cycle fatigue (LCF), and the thermo-mechanical coupling numerical model of extrusion cylinder was established. Then, the thermal load, assembly load and working load were applied to perform transient thermal-structure static analysis and find the dangerous point where the structure was damaged, and the stress history curve and cyclic stress-strain curve of the danger point were plotted. Furthermore, the local stress-strain relationship was estimated by using Norbert correction formula, and the local stress and strain at the danger point were calculated by substituting LCF parameters determined by the structural geometry and material. Finally, based on the local stress and strain conditions, the number of load cycles at which the fatigue failure of the structure occurred was calculated by using Landgraf damage formula. The result shows that the calculated number of load cycles is consistent with the actual service life of extrusion cylinder lining.

Funds：

天津市科技领军（培育）企业认定及支持项目(20YDLZGX00290)；天津市“项目+团队”重点培养专项（XC202050）

作者简介：苏芳(1985-)，女，硕士，高级工程师 E-mail：sufang@tz.com.cn

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