For the investigated magnesium alloys the dependence of fatigue crack growth rate on the stress intensity factor at 20 and −135 °C is described by the functiondl/dN =CK max n where C and n are constants for definite regions of Kmax values depending only on the alloy analysis and test temperature.
For MA2-1, MA15, and MA12 alloys relation dl/dN = f(Kmax) consists of two regions and a kink point on the graph (K cr ′ ) which is independent of temperature. For IMV6 and MA21 alloys this relation has two kink points (K cr ′ and K cr ″ ) which slightly increase with decreasing temperature.
A reduction in cyclic straining temperature does not have the same effect on the crack growth rate and type of fracture of different magnesium alloys. An increase in crack growth rate is accompanied by a change in the micromechanism of fracture due to tougher brittle intragranular fracture. Retaining the type of fracture or when it changes from brittle intragranular to one with more grooves, the crack growth rate decreases.
Alloys MA2-1 and IMV6 show highest resistance to fatigue crack initiation and growth at equal Kmax values at 20 and −135 °C, while the MA21 and MA12 alloys show in identical conditions minimum resistance.
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Translated from Problemy Prochnosti, No. 11, pp. 18–23, November, 1980.
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Serdyuk, V.A. Fatigue crack growth rate in magnesium alloys at room and low temperatures. Strength Mater 12, 1355–1361 (1980). https://doi.org/10.1007/BF01124557
- Stress Intensity
- Intensity Factor
- Fatigue Crack
- Stress Intensity Factor