Sequence effects on the life estimation of welded tubular structures made of S355J2H under uniaxial fatigue loading

IF 2.4 4区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Welding in the World Pub Date : 2024-03-15 DOI:10.1007/s40194-023-01605-4

Josef Neuhäusler, Jakob Roth, Markus Oswald, André Dürr, Klemens Rother

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Abstract

The use of hollow sections to form lightweight structures is widespread in common steel processing industries such as crane, commercial vehicle, steel bridge and agricultural machinery construction. The hollow sections are mainly designed as truss or frame structures, in some cases using high-strength and higher-strength steels in order to achieve optimum utilization of the component and material. A new collection of fatigue life data covering sequence effects and the accuracy of the linear damage accumulation is presented. Effects of the shape of the applied load spectra and sequence effects of different amplitudes have been investigated. This document covers tubes of 4 to 8 mm thickness made by low-carbon or mild steel S355J2H. In general, it was found that the spectrum shape and the loading sequence have an influence on the service life. Depending on the shape of the spectrum, random tests tended to lead to shorter service lives than tests with block-loading sequences. An influence of overloads was also found for the tests with interspersed overloads. Typical maximum linear damage sums taken from recommendations and codes of 0.2 or sometimes 0.5 are exceeded for all spectra investigated and in some of the cases even significantly above 1.0. Transferability of the recommendations to component-type structures like tubular joints needs revision to lift its lightweight potential. Using stress concentration factors (SCF) from finite element analysis, typical strength values for the structural and effective notch stress concepts are checked. All joints investigated show a significantly higher strength compared to the IIW recommendations using the structural stress approach or compared to the DVS 0905 with the effective notch stress approach.

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单轴疲劳载荷下 S355J2H 焊接管状结构寿命估算的序列效应

在起重机、商用车辆、钢桥和农用机械制造等普通钢材加工行业中，广泛使用空心型钢来形成轻质结构。空心型钢主要设计为桁架或框架结构，在某些情况下使用高强度和更高强度的钢材，以实现部件和材料的最佳利用。本文介绍了一系列新的疲劳寿命数据，包括序列效应和线性损伤累积的准确性。研究了外加载荷频谱形状的影响和不同振幅的序列效应。本文件涉及厚度为 4 至 8 毫米的钢管，材质为低碳或低碳钢 S355J2H。总体而言，研究发现频谱形状和加载顺序对使用寿命有影响。根据频谱的形状，随机试验的使用寿命往往短于分块加载试验。超载对穿插超载的试验也有影响。从建议和规范中得出的典型最大线性损伤和（0.2 或有时 0.5）在所有调查频谱中都超过了，在某些情况下甚至大大超过了 1.0。需要对这些建议进行修订，使其适用于管状连接等部件型结构，以提高其轻质潜力。利用有限元分析中的应力集中系数（SCF），检查了结构和有效缺口应力概念的典型强度值。与采用结构应力法的 IIW 建议相比，或与采用有效切口应力法的 DVS 0905 相比，所有调查的接头都显示出明显更高的强度。

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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来源期刊

Welding in the World METALLURGY & METALLURGICAL ENGINEERING-

CiteScore

4.20

自引率

14.30%

发文量

181

审稿时长

6-12 weeks

期刊介绍： The journal Welding in the World publishes authoritative papers on every aspect of materials joining, including welding, brazing, soldering, cutting, thermal spraying and allied joining and fabrication techniques.