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AFOSR Grants:– FA9550-05-1-0135 (OSU)– FA9550-05-1-0100 (UofM)– FA9550-05-1-0102 (JHU)
Funding:– AFOSR to OSU $ 1,119K– AFOSR to UofM $ 285K– AFOSR to JHU $ 195K– Total $ 1,599K
Team Gov’t AFOSR Manager: Brett ConnerGov’t Technical Manager: Dennis DimidukOSU Program Manager: Michael MillsUofM Program Manager: Tresa PollockJHU Program Manager: Kevin Hemker9 Faculty & 4 AFRL Mentors (+ Students)
Duration: Feb 05 - Feb 08
MEANS2Microstructure- and Micromechanism-Sensitive PropertyModels for Advanced Turbine Disk and Blade Systems
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Objective: Develop physics-based understanding and modeling capability for deformation/damage mechanisms in Ni-base disk and blade alloys
Approach: Integrated experiments and modeling for microstructure and micromechanisms developed in collaboration between AFRL, industry partners and universities
Payoff: Improved fidelity of AIM property and microstructure evolution models
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Processing Microstructure
Microstructure Modeling
+ Calibrating
Experiments
Micromechanical Modeling
+ Calibrating
Experiments
SlowCool
FastCool
Properties
Transitions: Providing fundamental micro-mechanical insights for the AIM augmentations at Pratt and Whitney and GEAE, and for the DARPA-Prognosis and NASA-Propulsion 21 efforts.
Goal: Augment/replace costly and time-intensive empirical databases with microstructure-sensitive, mechanism-based materials models.
MEANS 2: Approach for Developing Microstructure- and Micromechanism-Sensitive Property Models
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Slipped -matrix
Unslipped -matrix
Unslipped 'Pseudo-
twin/SESF
CSF
Deformation Mechanisms
PropertiesMicrostructure
(111)
1 nm
Mechanisms
Ch
arac
teri
zati
on
/V
alid
atio
nC
om
pu
tati
on
al
Mo
del
ing
EF-TEM/SEM/3DAP
Phase Field
-100
0
100
200
300
400
500
600
0 0.5 1 1.5 2
CSF
SESF
Pseudo twinm
J/m
2
Ab-Initio& MD
&twin =Dord ⋅ρ tpbtp
x2 lnf2 ⋅(γ pt − γ tt )
(τ eff ⋅btp − f2 .γ tt )
⎡
⎣⎢⎢
⎤
⎦⎥⎥
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100 nm
20 nm
Crystal Plasticity
MEANS 2: Approach for Developing Microstructure- and Micromechanism-Sensitive Property Models
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