Application and Verification of Fatigue Life Calculation Methods for AZ91E-T6 Cast Magnesium Alloy Under Variable Amplitude Loading

1993 ◽  
Vol 115 (4) ◽  
pp. 385-390 ◽  
Author(s):  
S. N. Perov ◽  
V. V. Ogarevic ◽  
R. I. Stephens
Keyword(s):  
Fatigue Crack ◽  
Fatigue Life ◽  
Magnesium Alloy ◽  
Fatigue Crack Initiation ◽  
Calculation Methods ◽  
Sand Cast ◽  
Variable Amplitude Loading ◽  
Variable Amplitude ◽  
Cast Magnesium Alloy ◽  
Cast Magnesium

The goal of this research was to determine the applicability of commonly used fatigue life calculation methods for variable amplitude loading with sand cast AZ91E-T6 magnesium alloy using notched “keyhole” specimens. Commercially available fatigue life calculation software packages were used to calculate the fatigue crack “initiation” life (1 mm crack) and fatigue crack growth life corresponding to the experiments. The resulting correlation between experimental and calculated fatigue lives ranged from good to poor, and from conservative to nonconservative, depending on the analysis method used. It was shown that these fatigue life calculation methods can be used with this sand cast magnesium alloy but with certain apprehension.

Corrosion Fatigue of AZ91E-T6 Cast Magnesium Alloy in a 3.5 Percent NaCl Aqueous Environment

1995 ◽  
Vol 117 (3) ◽  
pp. 293-298 ◽  
Author(s):  
R. I. Stephens ◽  
C. D. Schrader ◽  
K. B. Lease
Keyword(s):  
Fatigue Life ◽  
Magnesium Alloy ◽  
Fatigue Behavior ◽  
Fatigue Tests ◽  
Mean Stress ◽  
Constant Amplitude ◽  
Variable Amplitude ◽  
Cast Magnesium Alloy ◽  
Cast Magnesium ◽  
Variable Amplitude Fatigue

The objective of this research was to obtain and compare constant and variable amplitude fatigue behavior of AZ91E-T6 cast magnesium alloy in both an air and 3.5 percent NaCl aqueous corrosive environment. An additional objective was to determine if commonly used models that describe fatigue behavior and fatigue life are applicable to this material and test environment. Fatigue tests included constant amplitude strain-controlled low cycle fatigue with strain ratio, R, equal to 0, −1 and −2, Region II constant amplitude fatigue crack growth with load ratio, R, equal to 0.05 and 0.5 and variable amplitude fatigue tests using keyhole notched specimens. In all fatigue tests, the corrosion environment was significantly detrimental relative to the air environment. Mean strains influenced fatigue life only if accompanied by significant mean stress. The Morrow and Smith, Watson, and Topper mean stress models provided both accurate and inaccurate fatigue life calculations. Likewise, variable amplitude fatigue life calculations using the local strain approach and based upon the formation ofal mm crack at the keyhole notch were both accurate and fairly inaccurate depending on the specific model used.

Effect of Processing Layer on Fatigue Strength of Extruded AZ61 Magnesium Alloy

2013 ◽  
Vol 577-578 ◽  
pp. 429-432 ◽  
Author(s):  
Yukio Miyashita ◽  
Kyohei Kushihata ◽  
Toshifumi Kakiuchi ◽  
Mitsuhiro Kiyohara
Keyword(s):  
Fatigue Crack ◽  
Fatigue Life ◽  
Fatigue Strength ◽  
Magnesium Alloy ◽  
Crack Initiation ◽  
Crack Growth ◽  
Fatigue Crack Initiation ◽  
Fatigue Tests ◽  
Crack Growth Resistance ◽  
Az61 Magnesium Alloy

Fatigue Property of an Extruded AZ61 Magnesium Alloy with the Processing Layer Introduced by Machining was Investigated. Rotating Bending Fatigue Tests were Carried out with the Specimen with and without the Processing Layer. According to Results of the Fatigue Tests, Fatigue Life Significantly Increased by Introducing the Processing Layer to the Specimen Surface. Fatigue Crack Initiation and Propagation Behaviors were Observed by Replication Technique during the Fatigue Test. Fatigue Crack Initiation Life of the Specimen with the Processing Layer was Slightly Longer than that of the Specimen without the Processing Layer. Higher Fatigue Crack Growth Resistance was also Observed when the Fatigue Crack was Growing in the Processing Layer in the Specimen with the Processing Layer. the Longer Fatigue Life Observed in the Fatigue Test in the Specimen with the Processing Layer could be Mainly due to the Higher Crack Growth Resistance. it is Speculated that the Fatigue Strength can be Controlled by Change in Condition of Machining Process. it could be Effective way in Industry to Improved Fatigue Strength only by the Cutting Process without Additional Surface Treatment Process.

Fatigue Crack Growth Studies on ZE41A Cast Magnesium Alloy

2009 ◽  
Vol 4 (2) ◽  
pp. 58-63
Author(s):  
M. Sivapragash ◽  
◽  
P.R. Lakshminarayanan ◽  
K. Raghukandan ◽  
R. Karthikeyan ◽  
...  
Keyword(s):  
Fatigue Crack ◽  
Magnesium Alloy ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Growth Studies ◽  
Cast Magnesium Alloy ◽  
Cast Magnesium

Observing Load Sequence Effects on Simulated and Experimental Fatigue Crack Growth Occurrence

2011 ◽  
Vol 462-463 ◽  
pp. 489-494 ◽  
Author(s):  
S.M. Beden ◽  
Shahrum Abdullah ◽  
Ahmad Kamal Ariffin ◽  
Nawar A. Kadhim
Keyword(s):  
Fatigue Crack ◽  
Fatigue Life ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Test Data ◽  
Growth Models ◽  
Load Cycle ◽  
Engineering Structures ◽  
Variable Amplitude Loading ◽  
Variable Amplitude

Load cycle interactions can have a significant effect in fatigue crack growth (FCG) under variable amplitude loading. Studying of FCG and fatigue life calculation under spectrum loading is important for the reliable life prediction of engineering structures. Many models have been proposed, but yet no universal model exists. In this paper, a fatigue life predicted under various load spectra, using three different fatigue crack growth models namely, the Austen, modified Forman and NASGRO models. These models are validated with fatigue crack growth test data under various amplitude loadings. This application is performed with aids of three-point bend specimens of ASTM A533 steel material. The results clearly show the load sequences effect and the predicted results agree with some discrepancies between the different models as well as with the test data. Thus, neglecting the effect of cycle interaction in fatigue calculations under variable amplitude loading can lead to invalid life predictions.

Vibration Ability of Sand Cast Magnesium Alloy AZ80

2017 ◽  
Vol 4 (2) ◽  
pp. 81 ◽  
Author(s):  
Kamal Kant Singh ◽  
Siddharth Singh Yadav ◽  
Sakshi Singh
Keyword(s):  
Magnesium Alloy ◽  
Sand Cast ◽  
Cast Magnesium Alloy ◽  
Cast Magnesium

Damping capacity of sand cast magnesium alloy AZ91

2002 ◽  
Vol 18 (2) ◽  
pp. 198-200 ◽  
Author(s):  
S. Erchov ◽  
W. Riehemann ◽  
P. Gabor ◽  
K. Eigenfeld ◽  
O. Podobed
Keyword(s):  
Magnesium Alloy ◽  
Damping Capacity ◽  
Sand Cast ◽  
Alloy Az91 ◽  
Magnesium Alloy Az91 ◽  
Cast Magnesium Alloy ◽  
Cast Magnesium
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