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Meeting 2026 TMS Annual Meeting & Exhibition
Symposium Microstructure-Sensitive Modeling Across Length Scales: An MPMD/SMD Symposium in Honor of David L. McDowell
Presentation Title A Unified Microstructure-Sensitive Model Across Low and High Cycle Fatigue for Additively Manufactured IN718
Author(s) Krzysztof S. Stopka, Michael Sangid
On-Site Speaker (Planned) Krzysztof S. Stopka
Abstract Scope Microstructure-sensitive modeling offers a promising route to reduce reliance on extensive experimental campaigns for fatigue life prediction. However, many models focus solely on fatigue crack initiation (FCI) while being calibrated against total fatigue life of test coupons, limiting accuracy, especially in the low cycle fatigue (LCF) regime. Inspired by Professor McDowell’s contributions to fatigue modeling, this work unifies coupon-level experiments and crystal plasticity simulations for additively manufactured IN718, distinguishing among initiation, small crack growth, and long crack growth stages of life. We introduce a load-dependent non-local averaging (NLA) regularization strategy that reveals microplasticity/hot spot confinement in high cycle fatigue (HCF) and slip transmission across grain boundaries in LCF. A single parameter, the critical value of the accumulated plastic strain energy density, W_critical^p, governs fatigue across regimes, reproducing FCI lives and scatter over five orders of magnitude. Hot spot statistics further explain experimental trends in grain-scale activity with increasing load.
Proceedings Inclusion? Planned:
Keywords Computational Materials Science & Engineering, Mechanical Properties, ICME

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A Two-Surface Modeling to Improve Creep-Fatigue Predictions
A Unified Microstructure-Sensitive Model Across Low and High Cycle Fatigue for Additively Manufactured IN718
Atomic-Scale and Mesoscale Modeling of Deformation Twinning in Hexagonal Metals
Atomic Structure Dependence of Mesoscale Plastic Shear Localization
Collaborations and Advances in Multiscale Metal Plasticity
Data-Driven Approaches to Dislocation Mobility
Digital Twins for Accelerated Materials Innovation
Disconnection Mechanics: Segregation, Stability, and Mobility at Interfaces
Dislocation - Grain Boundary Interactions Modeled at Atomistic and Mesoscopic Length Scales
Dislocation Mobility in Metals Undergoing High Rate Plastic Deformation
E-32: Crystal Plasticity Simulation of Carbide Effects on Multiscale Mechanical Behavior of AISI 420 Steel
E-33: Predicting the Variability in Performance of Zircaloy Clad in Nuclear Reactors Environment
Effects of Grain Neighborhood on Local Piezoelectric Response and Stress Concentration in Bulk Polycrystals
Effects of Hydrogen Assisted Vacancy Production on Diffusional Creep Investigated via a Coupled Cluster Dynamics-Crystal Plasticity Framework
Four-Dimensional Reconstruction of Plastic Strain Localization From Surface-Velocity Measurements
From Atoms to Engines - Applications of Multi-Scale Modeling to Solve Critical Materials Challenges Facing Industry Today
Full-Field and Mean-Field Strain-Gradient Crystal Plasticity Models for Predicting Geometrically Necessary Dislocations and Length-Scale Dependent Mechanical Response
Genomic Material Design: Multiscale Fatigue and Fracture
Insights Into the Evolution of Slip in Cyclically Loaded IN718 Using Crystal Plasticity Finite Element, High Energy X-Ray Diffraction Microscopy and TriBeam Tomography
Interpreting the Back Stress: A Legacy of Dave McDowell
Leveraging Large Language Models to Extract Composition, Processing, Microstructure, and Property Data of Metallic Materials From Literature
Mechanistic Origin of Size Effects in Metals
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Microstructure-Sensitive Fracture Mechanics in Polycrystals
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Microstructure at the Atomic Scale
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Phase Transformations Induced by Large Plastic Deformations Under High Pressure: Four-Scale Theory and Experimental Confirmations
Plastic Strength of Irradiated Fe-Cr Alloys for Structural Applications in Fusion Reactors
PRISMS-Fatigue Framework: Applications for Additive Manufacturing
Radiation-Induced Dislocation Nucleation and Transformation in Aluminum Using Molecular Dynamics
Rapid Microstructural-Scale Defect Assessment for AM Materials
Shock Wave Propagation and Spallation Modeling in Aluminum Alloys Using Porous Crystal Plasticity
State Variable Modeling--Inspired Experiment Design
Strain Localization in Fatigue of FCC and HCP Materials
Strength of Metallic Alloys-Insights at Atomic Levels
Strengthening in Superalloys Using Local Phase Transformations at Defects
Synergy of Solute and Work Hardening in Fe-Cr Alloys: Insights From Dislocation Dynamics
Thermo-Mechanics of Single and Polycrystal Metal Deformation
Thermodynamics of Temperature-Strain Domain Phase Equilibria and Diagrams
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Uncertainty Quantification Across Spatiotemporal Scales: What is Lost at Scale Transitions
Understanding Dislocation Movement and Interaction With Twin Boundaries in Beta-Sn
Unified Stress-Strain Model to Accommodate Plasticity Behavior From Yield to the Structural Instability
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