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In situ X-ray imaging of fatigue crack growth from multiple defects in additively manufactured AlSi10Mg alloy

Qian, Weijian1; Wu, Shengchuan1,2; Wu, Zhengkai1; Ahmed, Saad2; Zhang, Wen2; 钱桂安n3; Withers, Philip J.2
Corresponding AuthorWu, Shengchuan(wusc@swjtu.edu.cn)
Source PublicationINTERNATIONAL JOURNAL OF FATIGUE
2022-02-01
Volume155Pages:13
ISSN0142-1123
AbstractDefects introduced during additive manufacturing currently control fatigue resistance and lead to a large scatter in lifetime, with pancake shaped lack of fusion (LOF) defects being particularly potent. In this study the fatigue crack propagation life of selective laser-melted (SLM) AlSi10Mg alloy is considered in cases where single cracks and multiple cracks can initiate from LOF defects under high cycle fatigue (HCF). Firstly, the aspect ratios of initially long fatigue cracks were determined for critical LOF defects obtained from X-ray CT renderings using the critical defect regularization method, and the response surface method used to obtain the stress intensity factor of the crack front quickly and continuously. Then a single crack propagation model considering the evolution of the crack aspect ratio established to predict the crack propagation life which is in good agreement within in situ X-ray CT imaging of the crack front when a single crack is dominant. The crack propagation phase was predicted to represent 35-60% of the total fatigue life representing a larger fraction at high stress amplitudes. Multiple cracks were found to initiate cracks at the larger stress amplitudes. In cases where multiple cracks arise this is non conservative and so a synergistic multiple fatigue crack growth (smFCG) model was developed based on multiple defects measured a priori by X-ray CT to depict the competitive cracking effect. Compared with the single crack model, the smFCG model predicts a shorter propagation life (by 5-10%) when multiple defects are involved since it considers all the initial defects within the crack initiation region. Given the propensity of large numbers of defects in AM material this approach may be more appropriate in many cases.
KeywordAdditive manufacturing (AM) Multiple defects

Synchrotron X-ray micro computed & nbsp Fatigue crack growth prediction AlSi10Mg alloys tomography ( mu CT)

DOI10.1016/j.ijfatigue.2021.106616
Indexed BySCI ; EI
Language英语
WOS IDWOS:000789644600004
WOS KeywordSTRESS INTENSITY FACTORS ; EQUIVALENT THICKNESS CONCEPTION ; SURFACE CRACKS ; POROSITY DEFECTS ; ROUND BARS ; SHAPE ; LIFE ; PREDICTION ; SPECIMENS ; TOMOGRAPHY
WOS Research AreaEngineering ; Materials Science
WOS SubjectEngineering, Mechanical ; Materials Science, Multidisciplinary
Funding ProjectJoint Fund of Large-scale Scientific Facility of National Natural Science Foundation of China[U2032121] ; European Research Council(CORREL-CT)[695638] ; EPSRC[EP/R00661X/1] ; EPSRC[EP/S019367/1] ; EPSRC[EP/P025021/1] ; EPSRC[EP/P025498/1] ; EPSRC[EP/P006566/1]
Funding OrganizationJoint Fund of Large-scale Scientific Facility of National Natural Science Foundation of China ; European Research Council(CORREL-CT) ; EPSRC
Classification一类
Ranking3+
ContributorWu, Shengchuan
Citation statistics
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/89067
Collection非线性力学国家重点实验室
Affiliation1.Southwest Jiaotong Univ, State Key Lab Tract Power, Chengdu 610031, Peoples R China;
2.Univ Manchester, Henry Royce Inst, Dept Mat, Manchester M13 9PL, England;
3.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Qian, Weijian,Wu, Shengchuan,Wu, Zhengkai,et al.

In situ X-ray imaging of fatigue crack growth from multiple defects in additively manufactured AlSi10Mg alloy

[J]. INTERNATIONAL JOURNAL OF FATIGUE,2022,155:13.
APA Qian, Weijian.,Wu, Shengchuan.,Wu, Zhengkai.,Ahmed, Saad.,Zhang, Wen.,...&Withers, Philip J..(2022).

In situ X-ray imaging of fatigue crack growth from multiple defects in additively manufactured AlSi10Mg alloy

.INTERNATIONAL JOURNAL OF FATIGUE,155,13.
MLA Qian, Weijian,et al."

In situ X-ray imaging of fatigue crack growth from multiple defects in additively manufactured AlSi10Mg alloy

".INTERNATIONAL JOURNAL OF FATIGUE 155(2022):13.
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