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Meeting MS&T22: Materials Science & Technology
Symposium Processing-Microstructure-Property Relationships of Titanium and Titanium Alloys
Presentation Title Microstructure-based Equivalent Initial Flaw Size (m-EIFS) Distributions for Airframe Structural Components
Author(s) Adam L. Pilchak, Manisha Banker, Michelle Harr, Joshua Shaffer, Thomas Carmody, Nathan Crosby, Juan Ocampo, Harry Millwater, Ayman Salem
On-Site Speaker (Planned) Adam L. Pilchak
Abstract Scope The damage tolerance sustainment philosophy was introduced in the late 1970’s. A key parameter in this methodology is the equivalent initial flaw size (EIFS). While the approach has proven successful, it has failed in certain cases where micromechanical phenomena overshade continuum mechanics. One such example is the case of beta-annealed titanium alloys which exhibit coarse lamellar microstructures with large colony sizes. In such situation small crack effects may persist to physically large crack sizes. Here we demonstrate a mechanism-based methodology for establishing an initial flaw size distribution from microstructure characterization data that is segmented based on observed fatigue damage mechanisms and which can be used in fatigue life prediction of beta-annealed titanium alloys. The approach is demonstrated within the probabilistic damage tolerance code SMART | DT and represents an improvement over existing fracture mechanics methods which may lead to anticonservative predictions.
Proceedings Inclusion? Undecided

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Approaches to Improving Yield-strength without Compromising Strain-hardenability in β-Titanium Alloys
Conventional Ti Alloys for Aeroengines And Aircraft Landing Gear Beams—a Data-driven Analysis for Selection of Ti-based Alloys and Future Directions
Design of New Metastable Ti Alloys and Determinations of Their Deformation Mechanisms Active during Tensile Deformation
Development of High Mechanical Strength and Low Elastic Modulus Ti-Nb-Fe-Sn-Zr Alloy for Orthopedic Implants
Dilatometric Study of Phase Transformations in Ti-407
Enhancing Low-cycle Fatigue Life of Commercially-pure Ti By Deformation At Cryogenic Temperature
Hierarchical Twinning Microstructure in the Metastable β Titanium Alloys
Insights from Three-dimensional Characterization of Twins in Titanium
Microstructure-based Equivalent Initial Flaw Size (m-EIFS) Distributions for Airframe Structural Components
Microstructure Evolution and Mechanical Behaviour of Two Phase (α+β) Ti-6Al-4V Alloy : An Effect of Heat Treatment Temperature and Duration
Nanoindentation Studies and Bulk Mechanical Properties of Additively Manufactured Titanium Alloys
Role of Oxygen on Phase Stability, Precipitation, and Deformation in Beta Titanium Alloys
Slip-twinning Interdependency in High-strength Alpha-beta Titanium Alloys
Tailoring Martensitic Transformation in Metastable Beta-Ti Alloys
Titanium Alloy Microstructures Produced by Additive Manufacturing and Deformation
Using Synchrotron X-ray Characterization to Understand Slip Processes in Titanium Alloys

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