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Fatigue performance of notched and hot-dip galvanized laser and mechanically cut S960 steel components considering local defects with the theory of critical distances
International Journal of Fatigue ( IF 6 ) Pub Date : 2022-07-14 , DOI: 10.1016/j.ijfatigue.2022.107127
Kalle Lipiäinen, Antti Ahola, Antti Kaijalainen, Timo Björk

Experimental fatigue tests were performed for a S960 steel grade, including hot-dip galvanized (HDG) round base material specimens, and laser cut, and machined notched component-sized specimens made of t = 6 mm S960 ultra-high-strength steel (UHSS) plates. Cracking after the HDG was found to have a major influence on fatigue strength and thus reducing the effect of surface quality on the fatigue performance. Design guidelines for notched HDG components are proposed, and HDG with UHSSs was found suitable for structures with geometrical notches. Multiparametric TCD-based 4R method application was introduced, and it was found to be applicable for the fatigue strength assessment of structural details with initial cracks.



中文翻译:

用临界距离理论考虑局部缺陷的缺口热镀锌激光和机械切割S960钢构件的疲劳性能

对 S960 钢种进行了疲劳试验试验,包括热浸镀锌 (HDG) 圆形母材试样,以及由t  = 6 mm S960 超高强度钢 (UHSS ) 制成的激光切割和机加工缺口部件尺寸试样) 盘子。发现 HDG 后的开裂对疲劳强度有重大影响,从而降低了表面质量对疲劳性能的影响。提出了缺口 HDG 组件的设计指南,发现带有 UHSS 的 HDG 适用于具有几何缺口的结构。介绍了基于多参数TCD的4R方法应用,发现该方法适用于具有初始裂纹的结构细节的疲劳强度评估。

更新日期:2022-07-17
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