Extraordinary specimen-size effect on long-life fatigue of additively manufactured AlSi10Mg
文献类型：期刊论文
| 作者 | Pan XN(潘向南)2; Tao ZQ(陶志强)2,3; Long, Xu1 |
| 刊名 | INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
 |
| 出版日期 | 2025-09-01 |
| 卷号 | 301页码:18 |
| 关键词 | Size effect Additive manufacturing Aluminium alloy Very-high-cycle fatigue (VHCF) Crack initiation Control volume |
| ISSN号 | 0020-7403 |
| DOI | 10.1016/j.ijmecsci.2025.110524 |
| 通讯作者 | Pan, Xiangnan(panxiangnan@lnm.imech.ac.cn) ; Long, Xu(xulong@nwpu.edu.cn) |
| 英文摘要 | It is well known that the mechanical properties of materials are strongly influenced by the size of the testing specimens, especially for the defect-induced high-cycle fatigue (HCF) and very-high-cycle fatigue (VHCF) of high-strength alloys with failure cycles beyond 107. Typically, this phenomenon of specimen-size effect becomes more pronounced as the fatigue life extends, and the fatal fatigue-crack initiates within a risk domain of control volume V90 where the applied stress is equal or larger than 90 % of the nominal one. Here, for the first time, we report a newly observed specimen-size effect on fatigue behavior of an additively manufactured aluminium alloy (AlSi10Mg) produced by powder bed fusion - laser beam. Fatigue tests were precisely conducted by ultrasonic cycling at a resonant frequency of 20 +/- 0.5 kHz under a stress ratio R = -1 at room temperature and in ambient air. Five types of specimens with minimal diameters of 3.5, 5.3, 8.1, 12.25 and 18.6 mm were tested. As specimen size increases, the HCF resistance drops sharply and exhibits a large scatter, whereas the VHCF limit degrades only slightly. For small-sized types, fatal crack initiates at specimen surface, subsurface or interior with the increasing failure cycles. But for large-sized types, fatal crack nucleates frequently in specimen interior even with "fish eye" morphology in HCF regime. Furthermore, the crack initiation site gradually tends to shift beyond the control volume part with the increase of specimen size, making the concept of V90 challenging for large-sized specimens, regardless of fatigue lives. |
| 分类号 | 一类 |
| WOS关键词 | HIGH-CYCLE FATIGUE ; REGIME N-GREATER-THAN-10(7) CYCLES ; CRACK INITIATION ; FAILURE ; MECHANISM ; STEEL ; MICROSTRUCTURE ; BEHAVIOR |
| 资助项目 | National Natural Science Foundation of China[11932020] |
| WOS研究方向 | Engineering ; Mechanics |
| 语种 | 英语 |
| WOS记录号 | WOS:001523228800002 |
| 资助机构 | National Natural Science Foundation of China |
| 其他责任者 | 潘向南 ; Long, Xu |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/103731]  |
| 专题 | 力学研究所_非线性力学国家重点实验室 |
| 作者单位 | 1.Northwestern Polytech Univ, Sch Mech & Transportat Engn, Xian 710129, Peoples R China 2.Chinese Acad Sci, LNM, Inst Mech, Beijing 100190, Peoples R China; 3.Beijing Union Univ, Coll Robot, Beijing 100020, Peoples R China; |
| 推荐引用方式 GB/T 7714 | Pan XN,Tao ZQ,Long, Xu. Extraordinary specimen-size effect on long-life fatigue of additively manufactured AlSi10Mg[J]. INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES,2025,301:18. |
| APA | 潘向南,陶志强,&Long, Xu.(2025).Extraordinary specimen-size effect on long-life fatigue of additively manufactured AlSi10Mg.INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES,301,18. |
| MLA | 潘向南,et al."Extraordinary specimen-size effect on long-life fatigue of additively manufactured AlSi10Mg".INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES 301(2025):18. |
入库方式： OAI收割
来源：力学研究所
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