为得到船用1560高镁铝合金材料疲劳特性及参数化影响，采用试验方法开展材料疲劳性能研究，研究结果表明1560高镁铝合金板材、型材、整体挤压壁板材料的中值应力范围疲劳极限值在150～190 MPa，厚度、生产工艺对材料疲劳性能影响不大，焊接和热矫正建造工艺会不同程度降低材料疲劳性能，其中对接接头疲劳极限值约为母材疲劳极限的0.4，说明镁含量的提高在提高铝合金母材疲劳强度的同时会使材料具有更高的焊接气孔敏感性、裂纹倾向性。最后，综合试验结果和国际焊接协会推荐值给出船体疲劳强度校核用S-N的选取建议。研究成果可为高镁铝合金的焊接工艺优化、在船体结构应用及疲劳强度校核提供技术支撑。
In order to obtain the fatigue characteristics and parametric influence of high-Magnesium aluminum alloys for marine 1560, the fatigue properties of materials are studied by test method. The research results show that the median stress range for fatigue strength of 1560 high-Magnesium aluminum alloy plates, profiles and extruded panels are 150～190MPa, the thickness and production technology have little effect on the fatigue properties of materials, and the welding and thermal correction will reduce the fatigue properties of materials to certain degrees, the welding joint fatigue strength is about 0.4 of material fatigue strength which means that the increase of Magnesium not only can improve the alloys’ fatigue strength but also make higher welding porosity sensitivity and crack tendency. Finally, based on the test results and the recommendations for fatigue from International Institute of Welding, some suggestions on the using of S-N curves for hull fatigue strength check are given. the research results can provide technical support for welding technology, the application of high-Magnesium aluminum alloys and the fatigue life evaluation.
2025,47(13): 1-6 收稿日期：2024-10-12
DOI：10.3404/j.issn.1672-7649.2025.13.001
分类号：U668.2
基金项目：国家自然科学基金资助项目（U2141213）
作者简介：张平(1978-),女,硕士,研究员,研究方向为高性能船舶结构设计与性能预报
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