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采用激光和电子束制造的高强度钢S960 QL焊接接头疲劳寿命研究

Research of the Fatigue Life of Welded Joints of High Strength Steel S960 QL Created Using Laser and Electron Beams.

作者信息

Sága Milan, Blatnická Mária, Blatnický Miroslav, Dižo Ján, Gerlici Juraj

机构信息

Department of Applied Mechanics, Faculty of Mechanical Engineering, University of Žilina, 010 26 Žilina, Slovakia.

Department of Transport and Handling Machines, Faculty of Mechanical Engineering, University of Žilina, 010 26 Žilina, Slovakia.

出版信息

Materials (Basel). 2020 Jun 3;13(11):2539. doi: 10.3390/ma13112539.

DOI:10.3390/ma13112539
PMID:32503166
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7321488/
Abstract

This study investigated the fatigue life of welded joints, in particular, the welds of the high-strength steel S960 QL. The welds were created using unconventional technologies by utilising laser and electron beams. The direct application of the research is intended to be carried out through implementing the results towards the design of tracks for the track-wheel chassis of the demining system Božena 5. The producer's experience shows the damage found in the current track design. The damage occurred during reversing the vehicle on a sand surface. Our goal was to solve this problem. The information acquired in this research will be a very important input factor for further designs of the track made of the tested material and its welds. The analysis of the residual stresses was also part of this study. The experimental research of the tested material's fatigue life and welded joints was realised on the specimens loaded using cyclic bending and cyclic torsion. These loads were dominant during the track operation. The fatigue life of the tested material was detected using a device designed by us. The measurement results were processed in the form of the Wöhler's S-N curves (alternating stress versus number cycles to failure) and compared with the current regulations issued by the International Institute of Welding (IIW) in the form of the FAT curves (IIW fatigue class). The achieved research results indicate that the modern welding technologies (laser and electron beams) used on the high-strength steel had no principal influence on the fatigue life of the tested material.

摘要

本研究调查了焊接接头的疲劳寿命，特别是高强度钢S960 QL的焊缝。这些焊缝是通过使用激光和电子束等非常规技术制造的。该研究的直接应用旨在通过将研究结果应用于排雷系统Božena 5履带轮底盘的履带设计来实现。生产商的经验表明，在当前的履带设计中发现了损坏。这种损坏发生在车辆在沙地表面倒车时。我们的目标是解决这个问题。本研究中获得的信息将是进一步设计由测试材料及其焊缝制成的履带的非常重要的输入因素。残余应力分析也是本研究的一部分。对测试材料的疲劳寿命和焊接接头的实验研究是在使用循环弯曲和循环扭转加载的试样上进行的。这些载荷在履带运行期间占主导地位。测试材料的疲劳寿命是使用我们设计的设备检测的。测量结果以韦勒S-N曲线（交变应力与失效循环次数）的形式进行处理，并与国际焊接学会（IIW）发布的现行规定以FAT曲线（IIW疲劳等级）的形式进行比较。取得的研究结果表明，用于高强度钢的现代焊接技术（激光和电子束）对测试材料的疲劳寿命没有主要影响。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2c74/7321488/7de5f83a92ab/materials-13-02539-g014.jpg
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