Abstract
Fatigue crack growth behavior of Al 7075-T6 alloy was investigated under in-plane biaxial fatigue loading with mixed-mode overloads. Cruciform geometry specimens were tested with specially programmed load spectra having single mixed-mode (mode I+II) overloads within a constant amplitude pure mode-I baseline load spectrum. The effects of mixed-mode overloads of different magnitudes on crack retardation behavior and crack growth micromechanisms were studied in detail by correlating the macroscale crack growth rates with fracture surface morphology through quantitative fractography. The retardation effects were found to increase with overload ratio and with the instantaneous fatigue crack at the instance of overload. Mode-mixity induced crack closure mechanisms played a dominant role in crack retardation for shorter cracks while mode-I plasticity induced crack closure was observed to be the dominant mechanism in the case of longer crack lengths.
| Original language | English (US) |
|---|---|
| Title of host publication | AIAA Scitech 2019 Forum |
| Publisher | American Institute of Aeronautics and Astronautics Inc, AIAA |
| ISBN (Print) | 9781624105784 |
| DOIs | |
| State | Published - Jan 1 2019 |
| Event | AIAA Scitech Forum, 2019 - San Diego, United States Duration: Jan 7 2019 → Jan 11 2019 |
Publication series
| Name | AIAA Scitech 2019 Forum |
|---|
Conference
| Conference | AIAA Scitech Forum, 2019 |
|---|---|
| Country | United States |
| City | San Diego |
| Period | 1/7/19 → 1/11/19 |
Fingerprint
ASJC Scopus subject areas
- Aerospace Engineering
Cite this
Biaxial fatigue crack propagation in AL 7075-t6 alloy under the influence of mixed-mode overloads. / Datta, Siddhant; Chattopadhyay, Aditi; Iyyer, Nagaraja; Phan, Nam.
AIAA Scitech 2019 Forum. American Institute of Aeronautics and Astronautics Inc, AIAA, 2019. (AIAA Scitech 2019 Forum).Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - Biaxial fatigue crack propagation in AL 7075-t6 alloy under the influence of mixed-mode overloads
AU - Datta, Siddhant
AU - Chattopadhyay, Aditi
AU - Iyyer, Nagaraja
AU - Phan, Nam
PY - 2019/1/1
Y1 - 2019/1/1
N2 - Fatigue crack growth behavior of Al 7075-T6 alloy was investigated under in-plane biaxial fatigue loading with mixed-mode overloads. Cruciform geometry specimens were tested with specially programmed load spectra having single mixed-mode (mode I+II) overloads within a constant amplitude pure mode-I baseline load spectrum. The effects of mixed-mode overloads of different magnitudes on crack retardation behavior and crack growth micromechanisms were studied in detail by correlating the macroscale crack growth rates with fracture surface morphology through quantitative fractography. The retardation effects were found to increase with overload ratio and with the instantaneous fatigue crack at the instance of overload. Mode-mixity induced crack closure mechanisms played a dominant role in crack retardation for shorter cracks while mode-I plasticity induced crack closure was observed to be the dominant mechanism in the case of longer crack lengths.
AB - Fatigue crack growth behavior of Al 7075-T6 alloy was investigated under in-plane biaxial fatigue loading with mixed-mode overloads. Cruciform geometry specimens were tested with specially programmed load spectra having single mixed-mode (mode I+II) overloads within a constant amplitude pure mode-I baseline load spectrum. The effects of mixed-mode overloads of different magnitudes on crack retardation behavior and crack growth micromechanisms were studied in detail by correlating the macroscale crack growth rates with fracture surface morphology through quantitative fractography. The retardation effects were found to increase with overload ratio and with the instantaneous fatigue crack at the instance of overload. Mode-mixity induced crack closure mechanisms played a dominant role in crack retardation for shorter cracks while mode-I plasticity induced crack closure was observed to be the dominant mechanism in the case of longer crack lengths.
UR - http://www.scopus.com/inward/record.url?scp=85068959674&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85068959674&partnerID=8YFLogxK
U2 - 10.2514/6.2019-0413
DO - 10.2514/6.2019-0413
M3 - Conference contribution
AN - SCOPUS:85068959674
SN - 9781624105784
T3 - AIAA Scitech 2019 Forum
BT - AIAA Scitech 2019 Forum
PB - American Institute of Aeronautics and Astronautics Inc, AIAA
ER -