Mroziński Stanisław, Golański Grzegorz, Jagielska-Wiaderek Karina, Szarek Arkadiusz
Faculty of Mechanical Engineering, Bydgoszcz University of Science and Technology, 85-074 Bydgoszcz, Poland.
Faculty of Production Engineering and Materials Technology, Czestochowa University of Technology, 42-201 Czestochowa, Poland.
Materials (Basel). 2025 May 19;18(10):2365. doi: 10.3390/ma18102365.
This paper presents the results of an analysis of the mechanical properties of the S420M steel samples collected both perpendicular and parallel to the rolling direction. The scope of the analysis included the following: a static tensile test, a hardness measurement, a low-cycle fatigue test, and a microstructure analysis of the analysed material. During the analysis, it was found that the rolling direction had little effect on the most important strength parameters determined in the static tensile test, but had a significant effect on the fatigue properties. During fatigue testing, a significant reduction in fatigue life (from 50% to almost 300%) was observed for samples perpendicular to the rolling direction. The largest reduction in fatigue life was observed at the ε = 0.25% strain level (almost 300%), while the smallest was at ε = 0.25% (50%). A comparative analysis of the results of constant-amplitude and programmed fatigue tests confirmed the validity of using accelerated life tests to determine the low-cycle fatigue properties of construction materials. The results of the experimental verification of the Palmgren-Miner linear hypothesis of fatigue damage accumulation confirmed the significant influence of the material data on the results of fatigue life calculations.
本文介绍了对沿轧制方向垂直和平行采集的S420M钢样本的力学性能分析结果。分析范围包括：静态拉伸试验、硬度测量、低周疲劳试验以及对分析材料的微观结构分析。在分析过程中发现，轧制方向对静态拉伸试验中测定的最重要强度参数影响不大，但对疲劳性能有显著影响。在疲劳试验期间，观察到与轧制方向垂直的样本的疲劳寿命显著降低（从50%降至近300%）。在应变水平ε = 0.25%时观察到疲劳寿命的最大降幅（近300%），而在ε = 0.05%时降幅最小（50%）。对常幅疲劳试验和程序疲劳试验结果的对比分析证实了使用加速寿命试验来确定建筑材料低周疲劳性能的有效性。帕尔姆格伦 - 迈纳疲劳损伤累积线性假设的实验验证结果证实了材料数据对疲劳寿命计算结果的重大影响。
