Fatigue crack growth in compacted and spheroidal graphite cast irons

被引：32
作者：
Hosdez, J. [1 ]
Limodin, N. [1 ]
Najjar, D. [1 ]
Witz, J-F. [1 ]
Charkaluk, E. [2 ]
Osmond, P. [3 ]
Forre, A. [4 ]
Szmytka, F. [5 ]
机构：
[1] Univ Lille, CNRS, Cent Lille, Lab Mecan Multiphys & Multiechelle LaMcube FRE 20, F-59000 Lille, France
[2] CNRS, UMR 7649, LMS, F-91762 Palaiseau, France
[3] Grp PSA, Chassis & Engine Mat Dept, F-78955 Canieres Sous Poissy, France
[4] Grp PSA, Sci & Future Technol Dept, F-78140 Velizy Villacoublay, France
[5] UMR EDF CNRS CEA ENSTA 9216, Inst Sci Mecan & Applicat Ind IMSIA, F-91762 Palaiseau, France
来源：
INTERNATIONAL JOURNAL OF FATIGUE | 2020年 / 131卷
关键词：
Compacted graphite cast iron; Spheroidal graphite cast iron; Microtomography; Fatigue; Crack propagation; DIGITAL IMAGE CORRELATION; AUSTEMPERED DUCTILE; BEHAVIOR; PROPAGATION; NODULES;
D O I：
10.1016/j.ijfatigue.2019.105319
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
The present paper focuses on the fatigue life of a Compacted Graphite cast Iron (CGI) as compared to a Spheroidal Graphite cast Iron (SGI). Fatigue crack growth laws have been determined with digital image correlation. Main difference between the materials is that cracks propagate faster in the CGI than in the SGI. X-ray tomography was also used in order to assess graphite morphologies and crack shapes. A complex morphology was observed for the vermicular graphite with rounded edges that limit notch effects. The crack spreads easily in CGI via a quasi cleavage mechanism and by propagating through graphite mainly by breaking the vermicules.
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页数：10
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