Chmelko Vladimír, Margetin Matúš, Zetková Ivana, Norek Martin, Likavčan Filip
Institude of Applied Mechanics and Mechatronics, Slovak University of Technology, Námestie Slobody 17, 81231 Bratislava, Slovakia.
Regional Technological Institute, Faculty of Mechanical Engineering, University of West Bohemia, Univerzitni 22, 306 14 Pilsen, Czech Republic.
Materials (Basel). 2024 Nov 29;17(23):5861. doi: 10.3390/ma17235861.
The paper presents the original results of cyclic testing of materials that are identical in chemical composition but produced by two different technologies: conventional metallurgy and additive manufacturing. For the aluminium alloy AlSi10Mg and the austenitic steel 316L, tensile curves, tension-compression and torsion alternating fatigue curves are experimentally obtained and presented. The experimental results are compared for two fabrication technologies-conventional metallurgy and additive DLMS technology. The results indicate a significant effect of anisotropy on the fatigue performance of the AM materials and a different slope of the fatigue life curves in the cyclic torsion versus cyclic tension-compression. The static and, in particular, the fatigue properties of both materials are discussed in relation to the microstructure of the materials after conventional production and after additive manufacturing. This comparison allowed us to explain both the causes of the anisotropy of the AM materials and the different slope of the curves for normal and shear stresses under cyclic loading. Using the example of the strength assessment of bicycle frames, the possibility of progressively wider use of additive manufacturing for load-bearing structures is presented.
传统冶金和增材制造。对于铝合金AlSi10Mg和奥氏体不锈钢316L，通过实验获得并展示了拉伸曲线、拉压和扭转交变疲劳曲线。对传统冶金和增材DLMS技术这两种制造技术的实验结果进行了比较。结果表明各向异性对增材制造材料的疲劳性能有显著影响，并且在循环扭转与循环拉压中疲劳寿命曲线的斜率不同。讨论了两种材料在传统生产和增材制造后的静态性能，特别是疲劳性能与材料微观结构的关系。通过这种比较，我们能够解释增材制造材料各向异性的原因以及循环加载下正应力和剪应力曲线斜率不同的原因。以自行车车架强度评估为例，展示了增材制造在承重结构中越来越广泛应用的可能性。
