Microstructure dependence of fatigue crack propagation behavior in wrought magnesium alloy
This paper deals with the fatigue crack propagation behavior of rolled AZ31B magnesium alloy (grain size: approximately 40 m). Fatigue crack propagation tests were performed on single edge notched tension specimens at a stress ratio of R = 0.1 and a frequency of 10 Hz at room temperature. Loading...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Gruppo Italiano Frattura
2016-01-01
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| Series: | Fracture and Structural Integrity |
| Subjects: | |
| Online Access: | http://www.gruppofrattura.it/pdf/rivista/numero35/numero_35_art_10.pdf |
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| Summary: | This paper deals with the fatigue crack propagation behavior of rolled AZ31B magnesium alloy
(grain size: approximately 40 m). Fatigue crack propagation tests were performed on single edge notched
tension specimens at a stress ratio of R = 0.1 and a frequency of 10 Hz at room temperature. Loading axes were
parallel to the rolling direction; fatigue cracks propagated parallel to the transverse direction (L-T specimen),
parallel to the short transverse direction (L-S specimen). Loading axis was perpendicular to the rolling direction;
fatigue cracks propagated parallel to the transverse direction (S-T specimen). The crack growth rate (da/dN) of
the L-S specimen was several times lower than that of the L-T specimen in the examined stress intensity factor
range (K). Fracture surfaces of the L-T and L-S specimens showed many steps parallel and perpendicular,
respectively, to the macroscopic crack growth direction. The da/dN of the S-T specimen was higher than that of
the L-T and L-S specimens in the examined K. The fracture surface was covered by quasi-cleavage facets
independent of macroscopic crack growth direction, and the fracture surface roughness at low K was larger
than that at high K. |
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| ISSN: | 1971-8993 1971-8993 |