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Computationally Efficient Protocols to
Evaluate the Fatigue Resistance of Polycrystalline Materials
Noah H. Paulson, Matthew W. Priddy, Surya R. Kalidindi, and
David L. McDowell
Generate Microstructures
CPFEM: Calculate
local ๐บ๐field
get FIP fields + FIP EVDs
Evaluate HCF resistance
HCF EvaluationExisting Approach
Smith (2013).
+UMAT
๐ป๐ถ๐น๐๐๐ ๐๐ ๐ก๐๐๐๐:๐ > ๐ > ๐
(0001)min: 0, max: 8
Basal texture
3
Material Property RepresentationSVE Concept
Kanit, et al. (2003).
Numerous samples are needed to capture the statistics of the properties of the material. Let us call these samples statistical volume elements (SVEs)
4
RVE SVE set
vs.
BackgroundFatigue Indicator Parameters
FIPs are a surrogate measure of driving force for fatigue crack formation and growth
Critical Plane Approach
โข Fatemi-Socie Parameter
๐น๐ผ๐ ๐น๐ =โ๐พ๐๐๐ฅ
๐
21 + ๐
๐๐๐๐ฅ๐
๐๐ฆ
max
n
2
Crack formation due to intense
shear along the slip band of Ti-
6Al-4V Le Biavant, et al. (2001).
5
Fatemi, et al. (1988).
Problem StatementComputational Burdens
Hypothetical: Rank HCF resistance of the 12 heat treatments of Ti-64
๐ถ๐๐๐ก๐๐๐ = 12 microstructures โ100 SVEs
microstructureโ
1.5 hours โ 4 processors
๐๐๐ธ= ๐๐๐๐ ๐ก๐จ๐ฎ๐ซ๐ฌ
A more efficient approach is needed to make computational fatigue analysis feasible for industrial applications
6
HCF Study MKS Approach
MKS: Predict local ๐บ๐ก๐๐ก. field
Generate SVE set
(Statistical Volume Element)
get FIP fields + FIP EVDs
Evaluate HCF resistance
Estimate ๐บ๐๐from ๐บ๐ก๐๐ก.
๐บ๐๐
๐
๐ ๐ผ Integrate flow rule
๐พ ๐ผ
๐บ๐๐
๐บ๐ก๐๐ก. โ ๐บ๐๐
7
The Materials Knowledge System (MKS) is a localization technique to estimate local response (e.g., ๐๐๐) given
macroscopic applied condition
MKS Framework
๐บ ๐
๐บ ๐ฅ = ๐ฐ โ ๐
๐ป
๐ถ ๐, ๐ ๐ ๐ฅ + ๐, ๐ ๐๐๐๐
+ ๐
๐
๐ป
๐ป
๐ถ ๐, ๐โฒ, ๐, ๐โฒ ๐ ๐ฅ + ๐, ๐ ๐ ๐ฅ + ๐ + ๐โฒ, ๐โฒ ๐๐๐๐โฒ๐๐๐๐โฒ โโฏ ๐บ ๐ฅ
๐ ๐ฅ, ๐ =
๐ฟ
๐
๐๐ ๐ฟ๐๐ฟ(๐)๐๐ (๐ฅ)
Microstructure function:
๐ถ ๐, ๐ =
๐ฟ
๐ก
๐จ๐ก๐ฟ๐๐ฟ ๐ ๐๐ก ๐
Influence function:
๐๐ฟ ๐ : orthonormal Fourier basis ๐๐ (๐ฅ): indicator basis
(Kalidindi 2012), (Adams 2012), (Krรถner 1986), Yabansu (2014)
๐บ ๐ = ๐ ๐ ๐บ ๐
Influence Function
8
HCF Study MKS Approach
MKS: Predict local ๐บ๐ก๐๐ก. field
Generate SVE set
(Statistical Volume Element)
get FIP fields + FIP EVDs
Evaluate HCF resistance
Calibrate MKS Influence
Coefficients
Generate SVE set for training
FEM: Calculate local ๐บ๐ก๐๐ก. field
Estimate ๐บ๐๐from ๐บ๐ก๐๐ก.
๐บ๐๐
๐
๐ ๐ผ Integrate flow rule
๐พ ๐ผ
๐บ๐๐
๐บ๐ก๐๐ก. โ ๐บ๐๐
9
๐บ๐๐ =
๐ผ=1
๐
๐พ ๐ผ ๐0๐ผโจ๐0
๐ผ
๐ ๐ฆ๐
Calculate ๐บ๐๐
Calculate ๐บ๐๐
Calculate ๐ ๐ผ from ๐
๐บ๐๐๐๐๐
๐๐๐๐.
๐บ๐๐๐บ๐ก๐๐ก๐๐
๐บ๐ก๐๐ก๐๐ โ ๐บ๐๐
๐ โ ๐ช๐บ๐ก๐๐ก๐๐
๐พ ๐ผ = ๐พ0๐ ๐ผ โ ๐ ๐ผ โ ๐ ๐ผ
๐ท ๐ผ
๐
sgn ๐ ๐ผ โ ๐ ๐ผ
Integrate flow rule for ๐พ ๐ผ
(1) (2)
(3) (4)
10
HCF StudySVEs and Loading
DREAM.3D input information
โ Grain size distributionโข Avg. Grain Size: 43
elements
โ Misorientation distribution
โ Texture
xy
z
ฮตt
Fully-reversed cyclic loadingโข x-, y-, and z-direction uniaxial strainโข Periodic boundary conditions
11
HCF StudyMKS Results (ฮฑ-Ti Basal Texture)
ฮต11 mean error: 0.22%, ฮต11 max error: 1.3%
๐๐๐ โก๐๐๐๐น๐ธ๐ โ ๐๐๐
๐๐พ๐
๐๐๐๐น๐ธ๐
12
HCF Study Results
15
Gumbel distribution
โข New protocol 240X faster than traditional protocolsโข Traditional Protocol: 1.5 hours on 4 processors per SVEโข New Protocol: 90 seconds on 1 processor per SVE
โข Protocols have been developed to evaluate the HCF and LCF resistance of polycrystalline materials
๐พ ๐ผ = ๐พ ๐ผ ๐ ๐ผ , ๐บ๐๐ =
๐ผ=1
๐
๐พ ๐ผ ๐ท ๐ผ
โข HCF Study: New protocol 240X faster than traditional protocols
HCF/LCF StudyConclusions
16
Acknowledgements
Also thanks to Donald S. Shih (Boeing), Yuksel C. Yabansu(GT), Dipen Patel (GT), and David Brough (GT)
GOALIFunding provided by:
References
โข Alharbi HF, Kalidindi SR. Int J Plasticity 2015;66:71.
โข Adams BL, Kalidindi SR, Fullwood DT. Microstructure Sensitive Design for Performance Optimization: Elsevier Science, 2012.
โข Bunge HJ, Moris PR. Texture Analysis in Materials Science: Butterworth & Co, 1982
โข Fast T, Kalidindi SR. Acta Mater 2011;59:4595.
โข Kalidindi SR. ISRN Mater Sci 2012;2012:13.
โข Krรถner E. J Mech Phy Solids 1977;25:137.
โข Landi G, Niezgoda SR, Kalidindi SR. Acta Mater 2010;58:2716.
โข Przybyla C., Prasannavenkatesan R., Salajegheh N., McDowell D.L. Microstructure-sensitive modeling of high cycle fatigue. International Journal of Fatigue, Vol. 32, Iss. 3, (2010) pg. 512-525
โข Przybyla C.P., McDowell D.L. Simulation-based extreme value marked correlations in fatigue of advanced engineering alloys. Procedia Engineering, Vol. 2, Iss. 1, (2010) pg. 1045-1056
โข Smith BD. Masters Thesis 2013.
โข Yabansu YC, Patel DK, Kalidindi SR. Acta Mater 2014;81:151.
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