Influence of rolling texture on near-threshold crack extension behavior in aluminum alloy EN AW-6082
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Marcel Wicke
Abstract
The near-threshold crack extension mechanisms of long cracks in a commercial aluminum alloy in peak-aged and overaged condition were evaluated at a stress ratio of R = −1. Tests were performed both in a conventional resonant testing machine, using flat dog-bone specimens with through-wall cracks and on an ultrasonic fatigue testing system using hourglass-shaped samples with surface cracks. After introducing the initial crack, the crack was propagated at a nominally constant Kmax with values in the range of the initially determined threshold. The primary precipitates were found to act as microstructural barriers causing a local pinning of the crack front independent of the testing procedure and hence keeping the crack from extending continuously. This effect depends on the orientation of the initial crack with respect to the rolling texture which, in turn, determines the spatial distribution of the primary precipitates and the grain morphology. Overaging had a tendency to enhance the pinning potential of the primary precipitates.
References
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© 2019, Carl Hanser Verlag, München
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- Influence of rolling texture on near-threshold crack extension behavior in aluminum alloy EN AW-6082
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Articles in the same Issue
- Inhalt/Contents
- Contents
- Fachbeiträge/Technical Contributions
- StressLifetc – NDT-related assessment of the fatigue life of metallic materials
- Structural evolution of ceramic coatings by mechanical alloying
- Influence of rolling texture on near-threshold crack extension behavior in aluminum alloy EN AW-6082
- Influence of variation of energy per unit length on mechanical-technological properties of ultra-high-strength steel 22MnB5 in the laser beam welding process
- Comparative study on fatigue behavior between unbonded prestressed and ordinary reinforced reactive powder concrete beams
- Quantitative analysis of metal fiber morphology by level set image segmentation algorithms
- Mechanical properties of electro and butt fusion welded high-density polyethylene pipes
- Effects of ultrasonic welding parameters for solar collector applications
- Mechanical strength of single-lap joints bonded with nano graphene and MWCNT reinforced epoxy-based nanocomposite adhesives
- Optimum spatial variable blank holder forces determined by the sequential response surface method (SRSM) and a hybrid algorithm
- Experimental study on gas emission from coal mass with a rich microstructure
- Effect of water absorption on the flexural strength of a green sandwich composite
- Wavelet based pseudo color scaling for optimizing wear behavior of epoxy composites
- Damage characteristics of basalt fiber reinforced mortar under compression evaluated by acoustic emission