Stress Ratio Effects on Crack Opening Loads and Crack Growth Rates in Aluminum Alloy 2024 PDF Download
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Author: William T. Riddell
Publisher:
ISBN:
Category : Aluminum alloys
Languages : en
Pages : 24
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Book Description
Author: William T. Riddell
Publisher:
ISBN:
Category : Aluminum alloys
Languages : en
Pages : 24
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Book Description
Author: William T. Riddell
Publisher:
ISBN:
Category :
Languages : en
Pages : 22
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Author: United States. National Aeronautics and Space Administration
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: EP. Phillips
Publisher:
ISBN:
Category : Aluminum alloys
Languages : en
Pages : 11
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Book Description
Crack opening loads were determined in load-shedding fatigue crack growth threshold tests on 2024-T3 aluminum alloy at stress ratios R of -2, -1, 0, 0.33, 0.5, and 0.7. The effects of load-shedding procedure and rate were investigated. Values of threshold ?K were found to vary significantly with R, whereas values of threshold effective ?K did not. That is, the variation of threshold ?K with R was almost completely explained by accounting for the measured variation in crack opening load behavior with R. The load-shedding guidelines of ASTM Test Method for Measurement of Fatigue Crack Growth (E 647) produced a threshold ?K value for R = 0.7 that was in agreement with the value determined using a procedure that should minimize closure effects (constant-Kmax, increasing-Kmin test). At both R = 0 and R = 0.7, high load-shedding rates produced high values of threshold ?K caused by large closure effects.
Author: C. M. Hudson
Publisher:
ISBN:
Category : Aluminum alloys
Languages : en
Pages : 28
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Book Description
A series of fatigue tests with specimens subjected to constant amplitude and two-step axial loads were conducted on 12-inch-wide sheet specimens of 2024-T3 and 7075-T6 aluminum alloy to study the effects of a change in stress level on fatigue-crack propagation. Comparison of the results of the tests in which the specimens were tested at first a high and then a low stress level with those of the constant-stress-amplitude tests indicated that crack propagation was generally delayed after the transition to the lower stress level. In the tests in which the specimens were tested at first a low and then a high stress level, crack propagation continued at the expected rate after the change in stress levels.
Author: N. Ranganathan
Publisher:
ISBN:
Category : Block load tests
Languages : en
Pages : 25
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Book Description
The fatigue crack growth behavior of the aluminum alloy 2024 is analyzed using the crack closure and an energy-based concept. The different test conditions studied include load ratio and environmental effects, crack growth retardation following a single overload, and crack propagation under block load tests. Crack opening loads using the compliance technique permit the effect of load ratio to be taken into account. After an overload, in the deceleration phase, the evolution of the crack opening load is not compatible with that of the crack growth rate. The measured crack opening levels under constant-amplitude loading conditions are comparable to those predicted under plane strain conditions for moderate ?K levels. It is shown that most of the effects usually attributed to closure can be successfully explained using energy concepts. In particular, it is shown that there exists a linear relationship between the crack growth rate and the energy dissipated per cycle at high growth rates, which is valid for both the environments studied, and it corresponds to a crack growth mechanism characterized by striation formation during each cycle. For lower growth rates a power law relationship can be proposed between these two parameters. The above-mentioned linear relationship holds also for the block loading conditions based on total energy dissipated per block. Certain experimental facts bring out the effect of closure on the energy dissipated. It is further shown that the possible existence of a mixed (Mode I and Mode II) mode crack opening at the crack tip has to be taken into account to correctly evaluate the energy dissipated near the crack tip.
Author: C. M. Hudson
Publisher:
ISBN:
Category : Aluminum alloys
Languages : en
Pages : 36
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Stress ratio effects on fatigue crack growth in sheet aluminum alloys.
Author: Walter Illg
Publisher:
ISBN:
Category : Aluminum alloys
Languages : en
Pages : 24
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Author: Herbert F. Hardrath
Publisher:
ISBN:
Category : Fracture mechanics
Languages : en
Pages : 24
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Author: James C. Newman (Jr.)
Publisher:
ISBN:
Category :
Languages : en
Pages : 34
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