Details
| Original language | English |
|---|---|
| Pages (from-to) | 28-39 |
| Number of pages | 12 |
| Journal | International journal of fatigue |
| Volume | 84 |
| Publication status | Published - 21 Nov 2015 |
Abstract
The study of near-threshold fatigue crack growth has long remained an empirical field due principally to the highly microstructure-sensitive nature thereof. The primary challenges have been to forward physical model(s) informed by the governing micromechanism(s), which would be able to predict the experimental behaviors devoid of empiricism. Today, we have sophisticated experimental techniques (e.g. digital image correlation, electron microscopy) as well as atomistic simulation tools (e.g. molecular dynamics) at our disposal to finally revisit the century old fatigue problem in the light of physical phenomena therein. This paper is geared towards achieving such a feat with a very special type of materials, nano-twinned alloys, as the candidate materials, which are of great recent interest due to their reportedly superior damage properties. Specifically, we investigate how the microstructural features (e.g. slip transfer mechanism at coherent twin boundaries, twin thickness/spacing, frictional stress, pre-existent near-tip slip density) can be modulated to improve the damage resistance. The results suggest that these parameters considerably affect the crack propagation impedance (as quantified in terms of ΔKeffth). A thorough discussion of the current findings and the most recent literature developments in this regard are provided.
Keywords
- Damage tolerance, Microstructure, Nanoscale twin, Residual dislocation, Threshold stress intensity
ASJC Scopus subject areas
- Mathematics(all)
- Modelling and Simulation
- Materials Science(all)
- General Materials Science
- Engineering(all)
- Mechanics of Materials
- Engineering(all)
- Mechanical Engineering
- Engineering(all)
- Industrial and Manufacturing Engineering
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In: International journal of fatigue, Vol. 84, 21.11.2015, p. 28-39.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Role of nanotwins on fatigue crack growth resistance
T2 - Experiments and theory
AU - Alkan, Sertan
AU - Chowdhury, Piyas
AU - Sehitoglu, Huseyin
AU - Rateick, Richard G.
AU - Maier, Hans J.
PY - 2015/11/21
Y1 - 2015/11/21
N2 - The study of near-threshold fatigue crack growth has long remained an empirical field due principally to the highly microstructure-sensitive nature thereof. The primary challenges have been to forward physical model(s) informed by the governing micromechanism(s), which would be able to predict the experimental behaviors devoid of empiricism. Today, we have sophisticated experimental techniques (e.g. digital image correlation, electron microscopy) as well as atomistic simulation tools (e.g. molecular dynamics) at our disposal to finally revisit the century old fatigue problem in the light of physical phenomena therein. This paper is geared towards achieving such a feat with a very special type of materials, nano-twinned alloys, as the candidate materials, which are of great recent interest due to their reportedly superior damage properties. Specifically, we investigate how the microstructural features (e.g. slip transfer mechanism at coherent twin boundaries, twin thickness/spacing, frictional stress, pre-existent near-tip slip density) can be modulated to improve the damage resistance. The results suggest that these parameters considerably affect the crack propagation impedance (as quantified in terms of ΔKeffth). A thorough discussion of the current findings and the most recent literature developments in this regard are provided.
AB - The study of near-threshold fatigue crack growth has long remained an empirical field due principally to the highly microstructure-sensitive nature thereof. The primary challenges have been to forward physical model(s) informed by the governing micromechanism(s), which would be able to predict the experimental behaviors devoid of empiricism. Today, we have sophisticated experimental techniques (e.g. digital image correlation, electron microscopy) as well as atomistic simulation tools (e.g. molecular dynamics) at our disposal to finally revisit the century old fatigue problem in the light of physical phenomena therein. This paper is geared towards achieving such a feat with a very special type of materials, nano-twinned alloys, as the candidate materials, which are of great recent interest due to their reportedly superior damage properties. Specifically, we investigate how the microstructural features (e.g. slip transfer mechanism at coherent twin boundaries, twin thickness/spacing, frictional stress, pre-existent near-tip slip density) can be modulated to improve the damage resistance. The results suggest that these parameters considerably affect the crack propagation impedance (as quantified in terms of ΔKeffth). A thorough discussion of the current findings and the most recent literature developments in this regard are provided.
KW - Damage tolerance
KW - Microstructure
KW - Nanoscale twin
KW - Residual dislocation
KW - Threshold stress intensity
UR - http://www.scopus.com/inward/record.url?scp=84948844899&partnerID=8YFLogxK
U2 - 10.1016/j.ijfatigue.2015.11.012
DO - 10.1016/j.ijfatigue.2015.11.012
M3 - Article
AN - SCOPUS:84948844899
VL - 84
SP - 28
EP - 39
JO - International journal of fatigue
JF - International journal of fatigue
SN - 0142-1123
ER -